| 1 | <html> |
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| 2 | <head> |
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| 3 | <title>Higgs Processes</title> |
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| 4 | <link rel="stylesheet" type="text/css" href="pythia.css"/> |
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| 5 | <link rel="shortcut icon" href="pythia32.gif"/> |
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| 6 | </head> |
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| 7 | <body> |
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| 8 | |
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| 9 | <h2>Higgs Processes</h2> |
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| 10 | |
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| 11 | This page documents Higgs production within and beyond the Standard Model |
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| 12 | (SM and BSM for short). This includes several different processes and, |
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| 13 | for the BSM scenarios, a large set of parameters that would only be fixed |
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| 14 | within a more specific framework such as MSSM. Three choices can be made |
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| 15 | irrespective of the particular model: |
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| 16 | |
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| 17 | <p/><code>flag </code><strong> Higgs:cubicWidth </strong> |
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| 18 | (<code>default = <strong>off</strong></code>)<br/> |
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| 19 | The partial width of a Higgs particle to a pair of gauge bosons, |
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| 20 | <i>W^+ W^-</i> or <i>Z^0 Z^0</i>, depends cubically on the |
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| 21 | Higgs mass. When selecting the Higgs according to a Breit-Wigner, |
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| 22 | so that the actual mass <i>mHat</i> does not agree with the |
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| 23 | nominal <i>m_Higgs</i> one, an ambiguity arises which of the |
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| 24 | two to use [<a href="Bibliography.html" target="page">Sey95</a>]. The default is to use a linear |
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| 25 | dependence on <i>mHat</i>, i.e. a width proportional to |
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| 26 | <i>m_Higgs^2 * mHat</i>, while <code>on</code> gives a |
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| 27 | <i>mHat^3</i> dependence. This does not affect the widths to |
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| 28 | fermions, which only depend linearly on <i>mHat</i>. |
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| 29 | This flag is used both for SM and BSM Higgses. |
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| 30 | |
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| 31 | |
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| 32 | <p/><code>flag </code><strong> Higgs:runningLoopMass </strong> |
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| 33 | (<code>default = <strong>on</strong></code>)<br/> |
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| 34 | The partial width of a Higgs particle to a pair of gluons or photons, |
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| 35 | or a <i>gamma Z^0</i> pair, proceeds in part through quark loops, |
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| 36 | mainly <i>b</i> and <i>t</i>. There is some ambiguity what kind |
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| 37 | of masses to use. Default is running MSbar ones, but alternatively |
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| 38 | fixed pole masses are allowed (as was standard in PYTHIA 6), which |
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| 39 | typically gives a noticeably higher cross section for these channels. |
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| 40 | (For a decay to a pair of fermions, such as top, the running mass is |
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| 41 | used for couplings and the fixed one for phase space.) |
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| 42 | |
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| 43 | |
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| 44 | <p/><code>flag </code><strong> Higgs:clipWings </strong> |
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| 45 | (<code>default = <strong>on</strong></code>)<br/> |
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| 46 | The Breit-Wigner shape of a Higgs is nontrivial, owing to the rapid |
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| 47 | width variation with the mass of a Higgs. This imples that a Higgs |
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| 48 | of low nominal mass may still acquire a non-negligible high-end tail. |
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| 49 | The validity of the calculation may be questioned in these wings. |
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| 50 | With this option on, the <code>Higgs:wingsFac</code> value is used to |
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| 51 | cut away the wings. |
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| 52 | |
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| 53 | |
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| 54 | <p/><code>parm </code><strong> Higgs:wingsFac </strong> |
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| 55 | (<code>default = <strong>50.</strong></code>; <code>minimum = 0.</code>)<br/> |
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| 56 | With <code>Higgs:clipWings</code> on, all Higgs masses which deviate |
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| 57 | from the nominal one by more than <code>Higgs:wingsFac</code> |
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| 58 | times the nominal width are forbidden. This is achieved by setting |
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| 59 | the <code>mMin</code> and <code>mMax</code> values of the Higgs states |
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| 60 | at initialization (but never so as to allow a wider range than already |
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| 61 | set by the user, alternatively by the default values). |
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| 62 | |
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| 63 | |
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| 64 | <h3>Standard-Model Higgs, basic processes</h3> |
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| 65 | |
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| 66 | This section provides the standard set of processes that can be |
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| 67 | run together to provide a reasonably complete overview of possible |
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| 68 | production channels for a single SM Higgs. |
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| 69 | The main parameter is the choice of Higgs mass, which can be set in the |
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| 70 | normal <code>ParticleData</code> database; thereafter the properties |
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| 71 | within the SM are essentially fixed. |
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| 72 | |
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| 73 | <p/><code>flag </code><strong> HiggsSM:all </strong> |
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| 74 | (<code>default = <strong>off</strong></code>)<br/> |
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| 75 | Common switch for the group of Higgs production within the Standard Model. |
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| 76 | |
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| 77 | |
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| 78 | <p/><code>flag </code><strong> HiggsSM:ffbar2H </strong> |
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| 79 | (<code>default = <strong>off</strong></code>)<br/> |
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| 80 | Scattering <i>f fbar -> H^0</i>, where <i>f</i> sums over available |
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| 81 | flavours except top. Related to the mass-dependent Higgs point coupling |
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| 82 | to fermions, so at hadron colliders the bottom contribution will |
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| 83 | dominate. |
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| 84 | Code 901. |
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| 85 | |
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| 86 | |
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| 87 | <p/><code>flag </code><strong> HiggsSM:gg2H </strong> |
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| 88 | (<code>default = <strong>off</strong></code>)<br/> |
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| 89 | Scattering <i>g g -> H^0</i> via loop contributions primarily from |
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| 90 | top. |
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| 91 | Code 902. |
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| 92 | |
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| 93 | |
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| 94 | <p/><code>flag </code><strong> HiggsSM:gmgm2H </strong> |
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| 95 | (<code>default = <strong>off</strong></code>)<br/> |
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| 96 | Scattering <i>gamma gamma -> H^0</i> via loop contributions primarily |
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| 97 | from top and <i>W</i>. |
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| 98 | Code 903. |
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| 99 | |
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| 100 | |
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| 101 | <p/><code>flag </code><strong> HiggsSM:ffbar2HZ </strong> |
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| 102 | (<code>default = <strong>off</strong></code>)<br/> |
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| 103 | Scattering <i>f fbar -> H^0 Z^0</i> via <i>s</i>-channel <i>Z^0</i> |
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| 104 | exchange. |
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| 105 | Code 904. |
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| 106 | |
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| 107 | |
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| 108 | <p/><code>flag </code><strong> HiggsSM:ffbar2HW </strong> |
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| 109 | (<code>default = <strong>off</strong></code>)<br/> |
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| 110 | Scattering <i>f fbar -> H^0 W^+-</i> via <i>s</i>-channel <i>W^+-</i> |
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| 111 | exchange. |
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| 112 | Code 905. |
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| 113 | |
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| 114 | |
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| 115 | <p/><code>flag </code><strong> HiggsSM:ff2Hff(t:ZZ) </strong> |
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| 116 | (<code>default = <strong>off</strong></code>)<br/> |
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| 117 | Scattering <i>f f' -> H^0 f f'</i> via <i>Z^0 Z^0</i> fusion. |
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| 118 | Code 906. |
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| 119 | |
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| 120 | |
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| 121 | <p/><code>flag </code><strong> HiggsSM:ff2Hff(t:WW) </strong> |
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| 122 | (<code>default = <strong>off</strong></code>)<br/> |
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| 123 | Scattering <i>f_1 f_2 -> H^0 f_3 f_4</i> via <i>W^+ W^-</i> fusion. |
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| 124 | Code 907. |
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| 125 | |
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| 126 | |
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| 127 | <p/><code>flag </code><strong> HiggsSM:gg2Httbar </strong> |
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| 128 | (<code>default = <strong>off</strong></code>)<br/> |
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| 129 | Scattering <i>g g -> H^0 t tbar</i> via <i>t tbar</i> fusion |
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| 130 | (or, alternatively put, Higgs radiation off a top line). |
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| 131 | Warning: unfortunately this process is rather slow, owing to a |
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| 132 | lengthy cross-section expression and inefficient phase-space selection. |
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| 133 | Code 908. |
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| 134 | |
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| 135 | |
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| 136 | <p/><code>flag </code><strong> HiggsSM:qqbar2Httbar </strong> |
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| 137 | (<code>default = <strong>off</strong></code>)<br/> |
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| 138 | Scattering <i>q qbar -> H^0 t tbar</i> via <i>t tbar</i> fusion |
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| 139 | (or, alternatively put, Higgs radiation off a top line). |
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| 140 | Warning: unfortunately this process is rather slow, owing to a |
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| 141 | lengthy cross-section expression and inefficient phase-space selection. |
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| 142 | Code 909. |
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| 143 | |
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| 144 | |
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| 145 | <h3>Standard-Model Higgs, further processes</h3> |
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| 146 | |
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| 147 | A number of further production processes has been implemented, that |
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| 148 | are specializations of some of the above ones to the high-<i>pT</i> |
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| 149 | region. The sets therefore could not be used simultaneously |
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| 150 | without unphysical doublecounting, as further explained below. |
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| 151 | They are not switched on by the <code>HiggsSM:all</code> flag, but |
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| 152 | have to be switched on for each separate process after due consideration. |
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| 153 | |
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| 154 | <p/> |
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| 155 | The first three processes in this section are related to the Higgs |
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| 156 | point coupling to fermions, and so primarily are of interest for |
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| 157 | <i>b</i> quarks. It is here useful to begin by reminding that |
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| 158 | a process like <i>b bbar -> H^0</i> implies that a <i>b/bbar</i> |
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| 159 | is taken from each incoming hadron, leaving behind its respective |
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| 160 | antiparticle. The initial-state showers will then add one |
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| 161 | <i>g -> b bbar</i> branching on either side, so that effectively |
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| 162 | the process becomes <i>g g -> H0 b bbar</i>. This would be the |
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| 163 | same basic process as the <i>g g -> H^0 t tbar</i> one used for top. |
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| 164 | The difference is that (a) no PDF's are defined for top and |
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| 165 | (b) the shower approach would not be good enough to provide sensible |
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| 166 | kinematics for the <i>H^0 t tbar</i> subsystem. By contrast, owing |
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| 167 | to the <i>b</i> being much lighter than the Higgs, multiple |
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| 168 | gluon emissions must be resummed for <i>b</i>, as is done by PDF's |
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| 169 | and showers, in order to obtain a sensible description of the total |
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| 170 | production rate, when the <i>b</i> quarks predominantly are produced |
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| 171 | at small <i>pT</i> values. |
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| 172 | |
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| 173 | <p/><code>flag </code><strong> HiggsSM:qg2Hq </strong> |
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| 174 | (<code>default = <strong>off</strong></code>)<br/> |
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| 175 | Scattering <i>q g -> H^0 q</i>. This process gives first-order |
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| 176 | corrections to the <i>f fbar -> H^0</i> one above, and should only be |
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| 177 | used to study the high-<i>pT</i> tail, while <i>f fbar -> H^0</i> |
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| 178 | should be used for inclusive production. Only the dominant <i>c</i> |
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| 179 | and <i>b</i> contributions are included, and generated separately |
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| 180 | for technical reasons. Note that another first-order process would be |
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| 181 | <i>q qbar -> H^0 g</i>, which is not explicitly implemented here, |
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| 182 | but is obtained from showering off the lowest-order process. It does not |
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| 183 | contain any <i>b</i> at large <i>pT</i>, however, so is less |
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| 184 | interesting for many applications. |
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| 185 | Code 911. |
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| 186 | |
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| 187 | |
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| 188 | <p/><code>flag </code><strong> HiggsSM:gg2Hbbbar </strong> |
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| 189 | (<code>default = <strong>off</strong></code>)<br/> |
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| 190 | Scattering <i>g g -> H^0 b bbar</i>. This process is yet one order |
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| 191 | higher of the <i>b bbar -> H^0</i> and <i>b g -> H^0 b</i> chain, |
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| 192 | where now two quarks should be required above some large <i>pT</i> |
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| 193 | threshold. |
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| 194 | Warning: unfortunately this process is rather slow, owing to a |
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| 195 | lengthy cross-section expression and inefficient phase-space selection. |
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| 196 | Code 912. |
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| 197 | |
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| 198 | |
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| 199 | <p/><code>flag </code><strong> HiggsSM:qqbar2Hbbbar </strong> |
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| 200 | (<code>default = <strong>off</strong></code>)<br/> |
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| 201 | Scattering <i>q qbar -> H^0 b bbar</i> via an <i>s</i>-channel |
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| 202 | gluon, so closely related to the previous one, but typically less |
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| 203 | important owing to the smaller rate of (anti)quarks relative to |
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| 204 | gluons. |
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| 205 | Warning: unfortunately this process is rather slow, owing to a |
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| 206 | lengthy cross-section expression and inefficient phase-space selection. |
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| 207 | Code 913. |
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| 208 | |
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| 209 | |
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| 210 | <p/> |
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| 211 | The second set of processes are predominantly first-order corrections |
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| 212 | to the <i>g g -> H^0</i> process, again dominated by the top loop. |
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| 213 | We here only provide the kinematical expressions obtained in the |
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| 214 | limit that the top quark goes to infinity, but scaled to the |
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| 215 | finite-top-mass coupling in <i>g g -> H^0</i>. (Complete loop |
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| 216 | expressions are available e.g. in PYTHIA 6.4 but are very lengthy.) |
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| 217 | This provides a reasonably accurate description for "intermediate" |
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| 218 | <i>pT</i> values, but fails when the <i>pT</i> scale approaches |
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| 219 | the top mass. |
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| 220 | |
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| 221 | <p/><code>flag </code><strong> HiggsSM:gg2Hg(l:t) </strong> |
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| 222 | (<code>default = <strong>off</strong></code>)<br/> |
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| 223 | Scattering <i>g g -> H^0 g</i> via loop contributions primarily |
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| 224 | from top. |
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| 225 | Code 914. |
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| 226 | |
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| 227 | |
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| 228 | <p/><code>flag </code><strong> HiggsSM:qg2Hq(l:t) </strong> |
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| 229 | (<code>default = <strong>off</strong></code>)<br/> |
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| 230 | Scattering <i>q g -> H^0 q</i> via loop contributions primarily |
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| 231 | from top. Not to be confused with the <code>HiggsSM:qg2Hq</code> |
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| 232 | process above, with its direct fermion-to-Higgs coupling. |
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| 233 | Code 915. |
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| 234 | |
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| 235 | |
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| 236 | <p/><code>flag </code><strong> HiggsSM:qqbar2Hg(l:t) </strong> |
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| 237 | (<code>default = <strong>off</strong></code>)<br/> |
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| 238 | Scattering <i>q qbar -> H^0 g</i> via an <i>s</i>-channel gluon |
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| 239 | and loop contributions primarily from top. Is strictly speaking a |
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| 240 | "new" process, not directly derived from <i>g g -> H^0</i>, and |
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| 241 | could therefore be included in the standard mix without doublecounting, |
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| 242 | but is numerically negligible. |
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| 243 | Code 916. |
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| 244 | |
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| 245 | |
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| 246 | <h3>Beyond-the-Standard-Model Higgs, introduction</h3> |
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| 247 | |
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| 248 | Further Higgs multiplets arise in a number of scenarios. We here |
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| 249 | concentrate on the MSSM scenario with two Higgs doublets, but with |
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| 250 | flexibility enough that also other two-Higgs-doublet scenarios could |
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| 251 | be represented by a suitable choice of parameters. Conventionally the |
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| 252 | Higgs states are labelled <i>h^0, H^0, A^0</i> and <i>H^+-</i>. |
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| 253 | If the scalar and pseudocalar states mix the resulting states are |
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| 254 | labelled <i>H_1^0, H_2^0, H_3^0</i>. In process names and parameter |
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| 255 | explanations both notations will be used, but for settings labels |
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| 256 | we have adapted the shorthand hybrid notation <code>H1</code> for |
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| 257 | <i>h^0(H_1^0)</i>, <code>H2</code> for <i>H^0(H_2^0)</i> and |
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| 258 | <code>A3</code> for <i>A^0(H_3^0)</i>. (Recall that the |
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| 259 | <code>Settings</code> database does not distinguish upper- and lowercase |
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| 260 | characters, so that the user has one thing less to worry about, but here |
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| 261 | it causes probles with <i>h^0</i> vs. <i>H^0</i>.) We leave the issue |
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| 262 | of mass ordering between <i>H^0</i> and <i>A^0</i> open, and thereby |
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| 263 | also that of <i>H_2^0</i> and <i>H_3^0</i>. |
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| 264 | |
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| 265 | <p/><code>flag </code><strong> Higgs:useBSM </strong> |
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| 266 | (<code>default = <strong>off</strong></code>)<br/> |
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| 267 | Master switch to initialize and use the two-Higgs-doublet states. |
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| 268 | If off, only the above SM Higgs processes can be used, with couplings |
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| 269 | as predicted in the SM. If on, only the below BSM Higgs processes can |
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| 270 | be used, with couplings that can be set freely, also found further down |
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| 271 | on this page. |
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| 272 | |
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| 273 | |
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| 274 | <h3>Beyond-the-Standard-Model Higgs, basic processes</h3> |
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| 275 | |
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| 276 | This section provides the standard set of processes that can be |
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| 277 | run together to provide a reasonably complete overview of possible |
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| 278 | production channels for a single neutral Higgs state in a two-doublet |
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| 279 | scenarios such as MSSM. The list of processes for neutral states closely |
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| 280 | mimics the one found for the SM Higgs. Some of the processes |
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| 281 | vanish for a pure pseudoscalar <i>A^0</i>, but are kept for flexiblity |
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| 282 | in cases of mixing with the scalar <i>h^0</i> and <i>H^0</i> states, |
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| 283 | or for use in the context of non-MSSM models. This should work well to |
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| 284 | represent e.g. that a small admixture of the "wrong" parity would allow |
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| 285 | a process such as <i>q qbar -> A^0 Z^0</i>, which otherwise is forbidden. |
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| 286 | However, note that the loop integrals e.g. for <i>g g -> h^0/H^0/A^0</i> |
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| 287 | are hardcoded to be for scalars for the former two particles and for a |
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| 288 | pseudoscalar for the latter one, so absolute rates would not be |
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| 289 | correctly represented in the case of large scalar/pseudoscalar mixing. |
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| 290 | |
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| 291 | <p/><code>flag </code><strong> HiggsBSM:all </strong> |
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| 292 | (<code>default = <strong>off</strong></code>)<br/> |
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| 293 | Common switch for the group of Higgs production beyond the Standard Model, |
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| 294 | as listed below. |
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| 295 | |
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| 296 | |
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| 297 | <h4>1) <i>h^0(H_1^0)</i> processes</h4> |
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| 298 | |
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| 299 | <p/><code>flag </code><strong> HiggsBSM:allH1 </strong> |
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| 300 | (<code>default = <strong>off</strong></code>)<br/> |
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| 301 | Common switch for the group of <i>h^0(H_1^0)</i> production processes. |
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| 302 | |
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| 303 | |
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| 304 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H1 </strong> |
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| 305 | (<code>default = <strong>off</strong></code>)<br/> |
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| 306 | Scattering <i>f fbar -> h^0(H_1^0)</i>, where <i>f</i> sums over available |
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| 307 | flavours except top. |
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| 308 | Code 1001. |
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| 309 | |
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| 310 | |
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| 311 | <p/><code>flag </code><strong> HiggsBSM:gg2H1 </strong> |
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| 312 | (<code>default = <strong>off</strong></code>)<br/> |
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| 313 | Scattering <i>g g -> h^0(H_1^0)</i> via loop contributions primarily from |
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| 314 | top. |
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| 315 | Code 1002. |
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| 316 | |
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| 317 | |
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| 318 | <p/><code>flag </code><strong> HiggsBSM:gmgm2H1 </strong> |
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| 319 | (<code>default = <strong>off</strong></code>)<br/> |
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| 320 | Scattering <i>gamma gamma -> h^0(H_1^0)</i> via loop contributions |
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| 321 | primarily from top and <i>W</i>. |
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| 322 | Code 1003. |
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| 323 | |
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| 324 | |
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| 325 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H1Z </strong> |
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| 326 | (<code>default = <strong>off</strong></code>)<br/> |
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| 327 | Scattering <i>f fbar -> h^0(H_1^0) Z^0</i> via <i>s</i>-channel |
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| 328 | <i>Z^0</i> exchange. |
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| 329 | Code 1004. |
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| 330 | |
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| 331 | |
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| 332 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H1W </strong> |
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| 333 | (<code>default = <strong>off</strong></code>)<br/> |
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| 334 | Scattering <i>f fbar -> h^0(H_1^0) W^+-</i> via <i>s</i>-channel |
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| 335 | <i>W^+-</i> exchange. |
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| 336 | Code 1005. |
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| 337 | |
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| 338 | |
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| 339 | <p/><code>flag </code><strong> HiggsBSM:ff2H1ff(t:ZZ) </strong> |
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| 340 | (<code>default = <strong>off</strong></code>)<br/> |
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| 341 | Scattering <i>f f' -> h^0(H_1^0) f f'</i> via <i>Z^0 Z^0</i> fusion. |
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| 342 | Code 1006. |
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| 343 | |
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| 344 | |
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| 345 | <p/><code>flag </code><strong> HiggsBSM:ff2H1ff(t:WW) </strong> |
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| 346 | (<code>default = <strong>off</strong></code>)<br/> |
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| 347 | Scattering <i>f_1 f_2 -> h^0(H_1^0) f_3 f_4</i> via <i>W^+ W^-</i> |
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| 348 | fusion. |
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| 349 | Code 1007. |
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| 350 | |
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| 351 | |
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| 352 | <p/><code>flag </code><strong> HiggsBSM:gg2H1ttbar </strong> |
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| 353 | (<code>default = <strong>off</strong></code>)<br/> |
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| 354 | Scattering <i>g g -> h^0(H_1^0) t tbar</i> via <i>t tbar</i> fusion |
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| 355 | (or, alternatively put, Higgs radiation off a top line). |
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| 356 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 357 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 358 | Code 1008. |
|---|
| 359 | |
|---|
| 360 | |
|---|
| 361 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H1ttbar </strong> |
|---|
| 362 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 363 | Scattering <i>q qbar -> h^0(H_1^0) t tbar</i> via <i>t tbar</i> fusion |
|---|
| 364 | (or, alternatively put, Higgs radiation off a top line). |
|---|
| 365 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 366 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 367 | Code 1009. |
|---|
| 368 | |
|---|
| 369 | |
|---|
| 370 | <h4>2) <i>H^0(H_2^0)</i> processes</h4> |
|---|
| 371 | |
|---|
| 372 | <p/><code>flag </code><strong> HiggsBSM:allH2 </strong> |
|---|
| 373 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 374 | Common switch for the group of <i>H^0(H_2^0)</i> production processes. |
|---|
| 375 | |
|---|
| 376 | |
|---|
| 377 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H2 </strong> |
|---|
| 378 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 379 | Scattering <i>f fbar -> H^0(H_2^0)</i>, where <i>f</i> sums over available |
|---|
| 380 | flavours except top. |
|---|
| 381 | Code 1021. |
|---|
| 382 | |
|---|
| 383 | |
|---|
| 384 | <p/><code>flag </code><strong> HiggsBSM:gg2H2 </strong> |
|---|
| 385 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 386 | Scattering <i>g g -> H^0(H_2^0)</i> via loop contributions primarily from |
|---|
| 387 | top. |
|---|
| 388 | Code 1022. |
|---|
| 389 | |
|---|
| 390 | |
|---|
| 391 | <p/><code>flag </code><strong> HiggsBSM:gmgm2H2 </strong> |
|---|
| 392 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 393 | Scattering <i>gamma gamma -> H^0(H_2^0)</i> via loop contributions primarily |
|---|
| 394 | from top and <i>W</i>. |
|---|
| 395 | Code 1023. |
|---|
| 396 | |
|---|
| 397 | |
|---|
| 398 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H2Z </strong> |
|---|
| 399 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 400 | Scattering <i>f fbar -> H^0(H_2^0) Z^0</i> via <i>s</i>-channel |
|---|
| 401 | <i>Z^0</i> exchange. |
|---|
| 402 | Code 1024. |
|---|
| 403 | |
|---|
| 404 | |
|---|
| 405 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H2W </strong> |
|---|
| 406 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 407 | Scattering <i>f fbar -> H^0(H_2^0) W^+-</i> via <i>s</i>-channel |
|---|
| 408 | <i>W^+-</i> exchange. |
|---|
| 409 | Code 1025. |
|---|
| 410 | |
|---|
| 411 | |
|---|
| 412 | <p/><code>flag </code><strong> HiggsBSM:ff2H2ff(t:ZZ) </strong> |
|---|
| 413 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 414 | Scattering <i>f f' -> H^0(H_2^0) f f'</i> via <i>Z^0 Z^0</i> fusion. |
|---|
| 415 | Code 1026. |
|---|
| 416 | |
|---|
| 417 | |
|---|
| 418 | <p/><code>flag </code><strong> HiggsBSM:ff2H2ff(t:WW) </strong> |
|---|
| 419 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 420 | Scattering <i>f_1 f_2 -> H^0(H_2^0) f_3 f_4</i> via <i>W^+ W^-</i> fusion. |
|---|
| 421 | Code 1027. |
|---|
| 422 | |
|---|
| 423 | |
|---|
| 424 | <p/><code>flag </code><strong> HiggsBSM:gg2H2ttbar </strong> |
|---|
| 425 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 426 | Scattering <i>g g -> H^0(H_2^0) t tbar</i> via <i>t tbar</i> fusion |
|---|
| 427 | (or, alternatively put, Higgs radiation off a top line). |
|---|
| 428 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 429 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 430 | Code 1028. |
|---|
| 431 | |
|---|
| 432 | |
|---|
| 433 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H2ttbar </strong> |
|---|
| 434 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 435 | Scattering <i>q qbar -> H^0(H_2^0) t tbar</i> via <i>t tbar</i> fusion |
|---|
| 436 | (or, alternatively put, Higgs radiation off a top line). |
|---|
| 437 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 438 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 439 | Code 1029. |
|---|
| 440 | |
|---|
| 441 | <h4>3) <i>A^0(H_3^0)</i> processes</h4> |
|---|
| 442 | |
|---|
| 443 | <p/><code>flag </code><strong> HiggsBSM:allA3 </strong> |
|---|
| 444 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 445 | Common switch for the group of <i>A^0(H_3^0)</i> production processes. |
|---|
| 446 | |
|---|
| 447 | |
|---|
| 448 | <p/><code>flag </code><strong> HiggsBSM:ffbar2A3 </strong> |
|---|
| 449 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 450 | Scattering <i>f fbar -> A^0(H_3^0)</i>, where <i>f</i> sums over available |
|---|
| 451 | flavours except top. |
|---|
| 452 | Code 1041. |
|---|
| 453 | |
|---|
| 454 | |
|---|
| 455 | <p/><code>flag </code><strong> HiggsBSM:gg2A3 </strong> |
|---|
| 456 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 457 | Scattering <i>g g -> A^0(A_3^0)</i> via loop contributions primarily from |
|---|
| 458 | top. |
|---|
| 459 | Code 1042. |
|---|
| 460 | |
|---|
| 461 | |
|---|
| 462 | <p/><code>flag </code><strong> HiggsBSM:gmgm2A3 </strong> |
|---|
| 463 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 464 | Scattering <i>gamma gamma -> A^0(A_3^0)</i> via loop contributions primarily |
|---|
| 465 | from top and <i>W</i>. |
|---|
| 466 | Code 1043. |
|---|
| 467 | |
|---|
| 468 | |
|---|
| 469 | <p/><code>flag </code><strong> HiggsBSM:ffbar2A3Z </strong> |
|---|
| 470 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 471 | Scattering <i>f fbar -> A^0(A_3^0) Z^0</i> via <i>s</i>-channel |
|---|
| 472 | <i>Z^0</i> exchange. |
|---|
| 473 | Code 1044. |
|---|
| 474 | |
|---|
| 475 | |
|---|
| 476 | <p/><code>flag </code><strong> HiggsBSM:ffbar2A3W </strong> |
|---|
| 477 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 478 | Scattering <i>f fbar -> A^0(A_3^0) W^+-</i> via <i>s</i>-channel |
|---|
| 479 | <i>W^+-</i> exchange. |
|---|
| 480 | Code 1045. |
|---|
| 481 | |
|---|
| 482 | |
|---|
| 483 | <p/><code>flag </code><strong> HiggsBSM:ff2A3ff(t:ZZ) </strong> |
|---|
| 484 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 485 | Scattering <i>f f' -> A^0(A_3^0) f f'</i> via <i>Z^0 Z^0</i> fusion. |
|---|
| 486 | Code 1046. |
|---|
| 487 | |
|---|
| 488 | |
|---|
| 489 | <p/><code>flag </code><strong> HiggsBSM:ff2A3ff(t:WW) </strong> |
|---|
| 490 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 491 | Scattering <i>f_1 f_2 -> A^0(A_3^0) f_3 f_4</i> via <i>W^+ W^-</i> fusion. |
|---|
| 492 | Code 1047. |
|---|
| 493 | |
|---|
| 494 | |
|---|
| 495 | <p/><code>flag </code><strong> HiggsBSM:gg2A3ttbar </strong> |
|---|
| 496 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 497 | Scattering <i>g g -> A^0(A_3^0) t tbar</i> via <i>t tbar</i> fusion |
|---|
| 498 | (or, alternatively put, Higgs radiation off a top line). |
|---|
| 499 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 500 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 501 | Code 1048. |
|---|
| 502 | |
|---|
| 503 | |
|---|
| 504 | <p/><code>flag </code><strong> HiggsBSM:qqbar2A3ttbar </strong> |
|---|
| 505 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 506 | Scattering <i>q qbar -> A^0(A_3^0) t tbar</i> via <i>t tbar</i> fusion |
|---|
| 507 | (or, alternatively put, Higgs radiation off a top line). |
|---|
| 508 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 509 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 510 | Code 1049. |
|---|
| 511 | |
|---|
| 512 | <h4>4) <i>H+-</i> processes</h4> |
|---|
| 513 | |
|---|
| 514 | <p/><code>flag </code><strong> HiggsBSM:allH+- </strong> |
|---|
| 515 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 516 | Common switch for the group of <i>H^+-</i> production processes. |
|---|
| 517 | |
|---|
| 518 | |
|---|
| 519 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H+- </strong> |
|---|
| 520 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 521 | Scattering <i>f fbar' -> H^+-</i>, where <i>f, fbar'</i> sums over |
|---|
| 522 | available incoming flavours. Since couplings are assumed |
|---|
| 523 | generation-diagonal, in practice this means <i>c sbar -> H^+</i> |
|---|
| 524 | and <i>s cbar -> H^-</i>. |
|---|
| 525 | Code 1061. |
|---|
| 526 | |
|---|
| 527 | |
|---|
| 528 | <p/><code>flag </code><strong> HiggsBSM:bg2H+-t </strong> |
|---|
| 529 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 530 | Scattering <i>b g -> H^+ tbar</i>. At hadron colliders this is the |
|---|
| 531 | dominant process for single-charged-Higgs production. |
|---|
| 532 | Code 1062. |
|---|
| 533 | |
|---|
| 534 | |
|---|
| 535 | <h4>5) Higgs-pair processes</h4> |
|---|
| 536 | |
|---|
| 537 | <p/><code>flag </code><strong> HiggsBSM:allHpair </strong> |
|---|
| 538 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 539 | Common switch for the group of Higgs pair-production processes. |
|---|
| 540 | |
|---|
| 541 | |
|---|
| 542 | <p/><code>flag </code><strong> HiggsBSM:ffbar2A3H1 </strong> |
|---|
| 543 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 544 | Scattering <i>f fbar -> A^0(H_3) h^0(H_1)</i>. |
|---|
| 545 | Code 1081. |
|---|
| 546 | |
|---|
| 547 | |
|---|
| 548 | <p/><code>flag </code><strong> HiggsBSM:ffbar2A3H2 </strong> |
|---|
| 549 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 550 | Scattering <i>f fbar -> A^0(H_3) H^0(H_2)</i>. |
|---|
| 551 | Code 1082. |
|---|
| 552 | |
|---|
| 553 | |
|---|
| 554 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H+-H1 </strong> |
|---|
| 555 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 556 | Scattering <i>f fbar -> H^+- h^0(H_1)</i>. |
|---|
| 557 | Code 1083. |
|---|
| 558 | |
|---|
| 559 | |
|---|
| 560 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H+-H2 </strong> |
|---|
| 561 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 562 | Scattering <i>f fbar -> H^+- H^0(H_2)</i>. |
|---|
| 563 | Code 1084. |
|---|
| 564 | |
|---|
| 565 | |
|---|
| 566 | <p/><code>flag </code><strong> HiggsBSM:ffbar2H+H- </strong> |
|---|
| 567 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 568 | Scattering <i>f fbar -> H+ H-</i>. |
|---|
| 569 | Code 1085. |
|---|
| 570 | |
|---|
| 571 | |
|---|
| 572 | <h3>Beyond-the-Standard-Model Higgs, further processes</h3> |
|---|
| 573 | |
|---|
| 574 | This section mimics the above section on "Standard-Model Higgs, |
|---|
| 575 | further processes", i.e. it contains higher-order corrections |
|---|
| 576 | to the processes already listed. The two sets therefore could not |
|---|
| 577 | be used simultaneously without unphysical doublecounting. |
|---|
| 578 | They are not controlled by any group flag, but have to be switched |
|---|
| 579 | on for each separate process after due consideration. We refer to |
|---|
| 580 | the standard-model description for a set of further comments on |
|---|
| 581 | the processes. |
|---|
| 582 | |
|---|
| 583 | <h4>1) <i>h^0(H_1^0)</i> processes</h4> |
|---|
| 584 | |
|---|
| 585 | <p/><code>flag </code><strong> HiggsBSM:qg2H1q </strong> |
|---|
| 586 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 587 | Scattering <i>q g -> h^0 q</i>. This process gives first-order |
|---|
| 588 | corrections to the <i>f fbar -> h^0</i> one above, and should only be |
|---|
| 589 | used to study the high-<i>pT</i> tail, while <i>f fbar -> h^0</i> |
|---|
| 590 | should be used for inclusive production. Only the dominant <i>c</i> |
|---|
| 591 | and <i>b</i> contributions are included, and generated separately |
|---|
| 592 | for technical reasons. Note that another first-order process would be |
|---|
| 593 | <i>q qbar -> h^0 g</i>, which is not explicitly implemented here, |
|---|
| 594 | but is obtained from showering off the lowest-order process. It does not |
|---|
| 595 | contain any <i>b</i> at large <i>pT</i>, however, so is less |
|---|
| 596 | interesting for many applications. |
|---|
| 597 | Code 1011. |
|---|
| 598 | |
|---|
| 599 | |
|---|
| 600 | <p/><code>flag </code><strong> HiggsBSM:gg2H1bbbar </strong> |
|---|
| 601 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 602 | Scattering <i>g g -> h^0 b bbar</i>. This process is yet one order |
|---|
| 603 | higher of the <i>b bbar -> h^0</i> and <i>b g -> h^0 b</i> chain, |
|---|
| 604 | where now two quarks should be required above some large <i>pT</i> |
|---|
| 605 | threshold. |
|---|
| 606 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 607 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 608 | Code 1012. |
|---|
| 609 | |
|---|
| 610 | |
|---|
| 611 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H1bbbar </strong> |
|---|
| 612 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 613 | Scattering <i>q qbar -> h^0 b bbar</i> via an <i>s</i>-channel |
|---|
| 614 | gluon, so closely related to the previous one, but typically less |
|---|
| 615 | important owing to the smaller rate of (anti)quarks relative to |
|---|
| 616 | gluons. |
|---|
| 617 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 618 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 619 | Code 1013. |
|---|
| 620 | |
|---|
| 621 | |
|---|
| 622 | <p/><code>flag </code><strong> HiggsBSM:gg2H1g(l:t) </strong> |
|---|
| 623 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 624 | Scattering <i>g g -> h^0 g</i> via loop contributions primarily |
|---|
| 625 | from top. |
|---|
| 626 | Code 1014. |
|---|
| 627 | |
|---|
| 628 | |
|---|
| 629 | <p/><code>flag </code><strong> HiggsBSM:qg2H1q(l:t) </strong> |
|---|
| 630 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 631 | Scattering <i>q g -> h^0 q</i> via loop contributions primarily |
|---|
| 632 | from top. Not to be confused with the <code>HiggsBSM:qg2H1q</code> |
|---|
| 633 | process above, with its direct fermion-to-Higgs coupling. |
|---|
| 634 | Code 1015. |
|---|
| 635 | |
|---|
| 636 | |
|---|
| 637 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H1g(l:t) </strong> |
|---|
| 638 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 639 | Scattering <i>q qbar -> h^0 g</i> via an <i>s</i>-channel gluon |
|---|
| 640 | and loop contributions primarily from top. Is strictly speaking a |
|---|
| 641 | "new" process, not directly derived from <i>g g -> h^0</i>, and |
|---|
| 642 | could therefore be included in the standard mix without doublecounting, |
|---|
| 643 | but is numerically negligible. |
|---|
| 644 | Code 1016. |
|---|
| 645 | |
|---|
| 646 | |
|---|
| 647 | <h4>2) <i>H^0(H_2^0)</i> processes</h4> |
|---|
| 648 | |
|---|
| 649 | <p/><code>flag </code><strong> HiggsBSM:qg2H2q </strong> |
|---|
| 650 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 651 | Scattering <i>q g -> H^0 q</i>. This process gives first-order |
|---|
| 652 | corrections to the <i>f fbar -> H^0</i> one above, and should only be |
|---|
| 653 | used to study the high-<i>pT</i> tail, while <i>f fbar -> H^0</i> |
|---|
| 654 | should be used for inclusive production. Only the dominant <i>c</i> |
|---|
| 655 | and <i>b</i> contributions are included, and generated separately |
|---|
| 656 | for technical reasons. Note that another first-order process would be |
|---|
| 657 | <i>q qbar -> H^0 g</i>, which is not explicitly implemented here, |
|---|
| 658 | but is obtained from showering off the lowest-order process. It does not |
|---|
| 659 | contain any <i>b</i> at large <i>pT</i>, however, so is less |
|---|
| 660 | interesting for many applications. |
|---|
| 661 | Code 1031. |
|---|
| 662 | |
|---|
| 663 | |
|---|
| 664 | <p/><code>flag </code><strong> HiggsBSM:gg2H2bbbar </strong> |
|---|
| 665 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 666 | Scattering <i>g g -> H^0 b bbar</i>. This process is yet one order |
|---|
| 667 | higher of the <i>b bbar -> H^0</i> and <i>b g -> H^0 b</i> chain, |
|---|
| 668 | where now two quarks should be required above some large <i>pT</i> |
|---|
| 669 | threshold. |
|---|
| 670 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 671 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 672 | Code 1032. |
|---|
| 673 | |
|---|
| 674 | |
|---|
| 675 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H2bbbar </strong> |
|---|
| 676 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 677 | Scattering <i>q qbar -> H^0 b bbar</i> via an <i>s</i>-channel |
|---|
| 678 | gluon, so closely related to the previous one, but typically less |
|---|
| 679 | important owing to the smaller rate of (anti)quarks relative to |
|---|
| 680 | gluons. |
|---|
| 681 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 682 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 683 | Code 1033. |
|---|
| 684 | |
|---|
| 685 | |
|---|
| 686 | <p/><code>flag </code><strong> HiggsBSM:gg2H2g(l:t) </strong> |
|---|
| 687 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 688 | Scattering <i>g g -> H^0 g</i> via loop contributions primarily |
|---|
| 689 | from top. |
|---|
| 690 | Code 1034. |
|---|
| 691 | |
|---|
| 692 | |
|---|
| 693 | <p/><code>flag </code><strong> HiggsBSM:qg2H2q(l:t) </strong> |
|---|
| 694 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 695 | Scattering <i>q g -> H^0 q</i> via loop contributions primarily |
|---|
| 696 | from top. Not to be confused with the <code>HiggsBSM:qg2H1q</code> |
|---|
| 697 | process above, with its direct fermion-to-Higgs coupling. |
|---|
| 698 | Code 1035. |
|---|
| 699 | |
|---|
| 700 | |
|---|
| 701 | <p/><code>flag </code><strong> HiggsBSM:qqbar2H2g(l:t) </strong> |
|---|
| 702 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 703 | Scattering <i>q qbar -> H^0 g</i> via an <i>s</i>-channel gluon |
|---|
| 704 | and loop contributions primarily from top. Is strictly speaking a |
|---|
| 705 | "new" process, not directly derived from <i>g g -> H^0</i>, and |
|---|
| 706 | could therefore be included in the standard mix without doublecounting, |
|---|
| 707 | but is numerically negligible. |
|---|
| 708 | Code 1036. |
|---|
| 709 | |
|---|
| 710 | |
|---|
| 711 | <h4>3) <i>A^0(H_3^0)</i> processes</h4> |
|---|
| 712 | |
|---|
| 713 | <p/><code>flag </code><strong> HiggsBSM:qg2A3q </strong> |
|---|
| 714 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 715 | Scattering <i>q g -> A^0 q</i>. This process gives first-order |
|---|
| 716 | corrections to the <i>f fbar -> A^0</i> one above, and should only be |
|---|
| 717 | used to study the high-<i>pT</i> tail, while <i>f fbar -> A^0</i> |
|---|
| 718 | should be used for inclusive production. Only the dominant <i>c</i> |
|---|
| 719 | and <i>b</i> contributions are included, and generated separately |
|---|
| 720 | for technical reasons. Note that another first-order process would be |
|---|
| 721 | <i>q qbar -> A^0 g</i>, which is not explicitly implemented here, |
|---|
| 722 | but is obtained from showering off the lowest-order process. It does not |
|---|
| 723 | contain any <i>b</i> at large <i>pT</i>, however, so is less |
|---|
| 724 | interesting for many applications. |
|---|
| 725 | Code 1051. |
|---|
| 726 | |
|---|
| 727 | |
|---|
| 728 | <p/><code>flag </code><strong> HiggsBSM:gg2A3bbbar </strong> |
|---|
| 729 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 730 | Scattering <i>g g -> A^0 b bbar</i>. This process is yet one order |
|---|
| 731 | higher of the <i>b bbar -> A^0</i> and <i>b g -> A^0 b</i> chain, |
|---|
| 732 | where now two quarks should be required above some large <i>pT</i> |
|---|
| 733 | threshold. |
|---|
| 734 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 735 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 736 | Code 1052. |
|---|
| 737 | |
|---|
| 738 | |
|---|
| 739 | <p/><code>flag </code><strong> HiggsBSM:qqbar2A3bbbar </strong> |
|---|
| 740 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 741 | Scattering <i>q qbar -> A^0 b bbar</i> via an <i>s</i>-channel |
|---|
| 742 | gluon, so closely related to the previous one, but typically less |
|---|
| 743 | important owing to the smaller rate of (anti)quarks relative to |
|---|
| 744 | gluons. |
|---|
| 745 | Warning: unfortunately this process is rather slow, owing to a |
|---|
| 746 | lengthy cross-section expression and inefficient phase-space selection. |
|---|
| 747 | Code 1053. |
|---|
| 748 | |
|---|
| 749 | |
|---|
| 750 | <p/><code>flag </code><strong> HiggsBSM:gg2A3g(l:t) </strong> |
|---|
| 751 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 752 | Scattering <i>g g -> A^0 g</i> via loop contributions primarily |
|---|
| 753 | from top. |
|---|
| 754 | Code 1054. |
|---|
| 755 | |
|---|
| 756 | |
|---|
| 757 | <p/><code>flag </code><strong> HiggsBSM:qg2A3q(l:t) </strong> |
|---|
| 758 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 759 | Scattering <i>q g -> A^0 q</i> via loop contributions primarily |
|---|
| 760 | from top. Not to be confused with the <code>HiggsBSM:qg2H1q</code> |
|---|
| 761 | process above, with its direct fermion-to-Higgs coupling. |
|---|
| 762 | Code 1055. |
|---|
| 763 | |
|---|
| 764 | |
|---|
| 765 | <p/><code>flag </code><strong> HiggsBSM:qqbar2A3g(l:t) </strong> |
|---|
| 766 | (<code>default = <strong>off</strong></code>)<br/> |
|---|
| 767 | Scattering <i>q qbar -> A^0 g</i> via an <i>s</i>-channel gluon |
|---|
| 768 | and loop contributions primarily from top. Is strictly speaking a |
|---|
| 769 | "new" process, not directly derived from <i>g g -> A^0</i>, and |
|---|
| 770 | could therefore be included in the standard mix without doublecounting, |
|---|
| 771 | but is numerically negligible. |
|---|
| 772 | Code 1056. |
|---|
| 773 | |
|---|
| 774 | |
|---|
| 775 | <h3>Parameters for Beyond-the-Standard-Model Higgs production and decay</h3> |
|---|
| 776 | |
|---|
| 777 | This section offers a big flexibility to set couplings of the various |
|---|
| 778 | Higgs states to fermions and gauge bosons, and also to each other. |
|---|
| 779 | The intention is that, for scenarios like MSSM, you should use standard |
|---|
| 780 | input from the <a href="SUSYLesHouchesAccord.html" target="page">SUSY Les Houches |
|---|
| 781 | Accord</a>, rather than having to set it all yourself. In other cases, |
|---|
| 782 | however, the freedom is there for you to use. Kindly note that some |
|---|
| 783 | of the internal calculations of partial widths from the parameters provided |
|---|
| 784 | do not include mixing between the scalar and pseudoscalar states. |
|---|
| 785 | |
|---|
| 786 | <p/> |
|---|
| 787 | Masses would be set in the <code>ParticleData</code> database, |
|---|
| 788 | while couplings are set below. When possible, the couplings of the Higgs |
|---|
| 789 | states are normalized to the corresponding coupling within the SM. |
|---|
| 790 | When not, their values within the MSSM are indicated, from which |
|---|
| 791 | it should be straightforward to understand what to use instead. |
|---|
| 792 | The exception is some couplings that vanish also in the MSSM, where the |
|---|
| 793 | normalization has been defined in close analogy with nonvanishing ones. |
|---|
| 794 | Some parameter names are asymmetric but crossing can always be used, |
|---|
| 795 | i.e. the coupling for <i>A^0 -> H^0 Z^0</i> obviously is also valid |
|---|
| 796 | for <i>H^0 -> A^0 Z^0</i> and <i>Z^0 -> H^0 A^0</i>. |
|---|
| 797 | Note that couplings usually appear quadratically in matrix elements. |
|---|
| 798 | |
|---|
| 799 | <p/><code>parm </code><strong> HiggsH1:coup2d </strong> |
|---|
| 800 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 801 | The <i>h^0(H_1^0)</i> coupling to down-type quarks. |
|---|
| 802 | |
|---|
| 803 | |
|---|
| 804 | <p/><code>parm </code><strong> HiggsH1:coup2u </strong> |
|---|
| 805 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 806 | The <i>h^0(H_1^0)</i> coupling to up-type quarks. |
|---|
| 807 | |
|---|
| 808 | |
|---|
| 809 | <p/><code>parm </code><strong> HiggsH1:coup2l </strong> |
|---|
| 810 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 811 | The <i>h^0(H_1^0)</i> coupling to (charged) leptons. |
|---|
| 812 | |
|---|
| 813 | |
|---|
| 814 | <p/><code>parm </code><strong> HiggsH1:coup2Z </strong> |
|---|
| 815 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 816 | The <i>h^0(H_1^0)</i> coupling to <i>Z^0</i>. |
|---|
| 817 | |
|---|
| 818 | |
|---|
| 819 | <p/><code>parm </code><strong> HiggsH1:coup2W </strong> |
|---|
| 820 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 821 | The <i>h^0(H_1^0)</i> coupling to <i>W^+-</i>. |
|---|
| 822 | |
|---|
| 823 | |
|---|
| 824 | <p/><code>parm </code><strong> HiggsH1:coup2Hchg </strong> |
|---|
| 825 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 826 | The <i>h^0(H_1^0)</i> coupling to <i>H^+-</i> (in loops). |
|---|
| 827 | Is <i>sin(beta - alpha) + cos(2 beta) sin(beta + alpha) / |
|---|
| 828 | (2 cos^2theta_W)</i> in the MSSM. |
|---|
| 829 | |
|---|
| 830 | |
|---|
| 831 | <p/><code>parm </code><strong> HiggsH2:coup2d </strong> |
|---|
| 832 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 833 | The <i>H^0(H_2^0)</i> coupling to down-type quarks. |
|---|
| 834 | |
|---|
| 835 | |
|---|
| 836 | <p/><code>parm </code><strong> HiggsH2:coup2u </strong> |
|---|
| 837 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 838 | The <i>H^0(H_2^0)</i> coupling to up-type quarks. |
|---|
| 839 | |
|---|
| 840 | |
|---|
| 841 | <p/><code>parm </code><strong> HiggsH2:coup2l </strong> |
|---|
| 842 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 843 | The <i>H^0(H_2^0)</i> coupling to (charged) leptons. |
|---|
| 844 | |
|---|
| 845 | |
|---|
| 846 | <p/><code>parm </code><strong> HiggsH2:coup2Z </strong> |
|---|
| 847 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 848 | The <i>H^0(H_2^0)</i> coupling to <i>Z^0</i>. |
|---|
| 849 | |
|---|
| 850 | |
|---|
| 851 | <p/><code>parm </code><strong> HiggsH2:coup2W </strong> |
|---|
| 852 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 853 | The <i>H^0(H_2^0)</i> coupling to <i>W^+-</i>. |
|---|
| 854 | |
|---|
| 855 | |
|---|
| 856 | <p/><code>parm </code><strong> HiggsH2:coup2Hchg </strong> |
|---|
| 857 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 858 | The <i>H^0(H_2^0)</i> coupling to <i>H^+-</i> (in loops). |
|---|
| 859 | Is <i>cos(beta - alpha) + cos(2 beta) cos(beta + alpha) / |
|---|
| 860 | (2 cos^2theta_W)</i> in the MSSM. |
|---|
| 861 | |
|---|
| 862 | |
|---|
| 863 | <p/><code>parm </code><strong> HiggsH2:coup2H1H1 </strong> |
|---|
| 864 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 865 | The <i>H^0(H_2^0)</i> coupling to a <i>h^0(H_1^0)</i> pair. |
|---|
| 866 | Is <i>cos(2 alpha) cos(beta + alpha) - 2 sin(2 alpha) |
|---|
| 867 | sin(beta + alpha)</i> in the MSSM. |
|---|
| 868 | |
|---|
| 869 | |
|---|
| 870 | <p/><code>parm </code><strong> HiggsH2:coup2A3A3 </strong> |
|---|
| 871 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 872 | The <i>H^0(H_2^0)</i> coupling to an <i>A^0(H_3^0)</i> pair. |
|---|
| 873 | Is <i>cos(2 beta) cos(beta + alpha)</i> in the MSSM. |
|---|
| 874 | |
|---|
| 875 | |
|---|
| 876 | <p/><code>parm </code><strong> HiggsH2:coup2H1Z </strong> |
|---|
| 877 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 878 | The <i>H^0(H_2^0)</i> coupling to a <i>h^0(H_1^0) Z^0</i> pair. |
|---|
| 879 | Vanishes in the MSSM. |
|---|
| 880 | |
|---|
| 881 | |
|---|
| 882 | <p/><code>parm </code><strong> HiggsH2:coup2A3H1 </strong> |
|---|
| 883 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 884 | The <i>H^0(H_2^0)</i> coupling to an <i>A^0(H_3^0) h^0(H_1^0)</i> pair. |
|---|
| 885 | Vanishes in the MSSM. |
|---|
| 886 | |
|---|
| 887 | |
|---|
| 888 | <p/><code>parm </code><strong> HiggsH2:coup2HchgW </strong> |
|---|
| 889 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 890 | The <i>H^0(H_2^0)</i> coupling to a <i>H^+- W-+</i> pair. |
|---|
| 891 | Is <i>sin(beta - alpha)</i> in the MSSM. |
|---|
| 892 | |
|---|
| 893 | |
|---|
| 894 | <p/><code>parm </code><strong> HiggsA3:coup2d </strong> |
|---|
| 895 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 896 | The <i>A^0(H_3^0)</i> coupling to down-type quarks. |
|---|
| 897 | |
|---|
| 898 | |
|---|
| 899 | <p/><code>parm </code><strong> HiggsA3:coup2u </strong> |
|---|
| 900 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 901 | The <i>A^0(H_3^0)</i> coupling to up-type quarks. |
|---|
| 902 | |
|---|
| 903 | |
|---|
| 904 | <p/><code>parm </code><strong> HiggsA3:coup2l </strong> |
|---|
| 905 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 906 | The <i>A^0(H_3^0)</i> coupling to (charged) leptons. |
|---|
| 907 | |
|---|
| 908 | |
|---|
| 909 | <p/><code>parm </code><strong> HiggsA3:coup2H1Z </strong> |
|---|
| 910 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 911 | The <i>A^0(H_3^0)</i> coupling to a <i>h^0(H_1^0) Z^0</i> pair. |
|---|
| 912 | Is <i>cos(beta - alpha)</i> in the MSSM. |
|---|
| 913 | |
|---|
| 914 | |
|---|
| 915 | <p/><code>parm </code><strong> HiggsA3:coup2H2Z </strong> |
|---|
| 916 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 917 | The <i>A^0(H_3^0)</i> coupling to a <i>H^0(H_2^0) Z^0</i> pair. |
|---|
| 918 | Is <i>sin(beta - alpha)</i> in the MSSM. |
|---|
| 919 | |
|---|
| 920 | |
|---|
| 921 | <p/><code>parm </code><strong> HiggsA3:coup2Z </strong> |
|---|
| 922 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 923 | The <i>A^0(H_3^0)</i> coupling to <i>Z^0</i>. |
|---|
| 924 | Vanishes in the MSSM. |
|---|
| 925 | |
|---|
| 926 | |
|---|
| 927 | <p/><code>parm </code><strong> HiggsA3:coup2W </strong> |
|---|
| 928 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 929 | The <i>A^0(H_3^0)</i> coupling to <i>W^+-</i>. |
|---|
| 930 | Vanishes in the MSSM. |
|---|
| 931 | |
|---|
| 932 | |
|---|
| 933 | <p/><code>parm </code><strong> HiggsA3:coup2H1H1 </strong> |
|---|
| 934 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 935 | The <i>A^0(H_3^0)</i> coupling to a <i>h^0(H_1^0)</i> pair. |
|---|
| 936 | Vanishes in the MSSM. |
|---|
| 937 | |
|---|
| 938 | |
|---|
| 939 | <p/><code>parm </code><strong> HiggsA3:coup2Hchg </strong> |
|---|
| 940 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 941 | The <i>A^0(H_3^0)</i> coupling to <i>H^+-</i>. |
|---|
| 942 | Vanishes in the MSSM. |
|---|
| 943 | |
|---|
| 944 | |
|---|
| 945 | <p/><code>parm </code><strong> HiggsA3:coup2HchgW </strong> |
|---|
| 946 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 947 | The <i>A^0(H_3^0)</i> coupling to a <i>H^+- W-+</i> pair. |
|---|
| 948 | Is 1 in the MSSM. |
|---|
| 949 | |
|---|
| 950 | |
|---|
| 951 | <p/><code>parm </code><strong> HiggsHchg:tanBeta </strong> |
|---|
| 952 | (<code>default = <strong>5.</strong></code>)<br/> |
|---|
| 953 | The <i>tan(beta)</i> value, which leads to an enhancement of the |
|---|
| 954 | <i>H^+-</i> coupling to down-type fermions and suppression to |
|---|
| 955 | up-type ones. The same angle also appears in many other places, |
|---|
| 956 | but this particular parameter is only used for the charged-Higgs case. |
|---|
| 957 | |
|---|
| 958 | |
|---|
| 959 | <p/><code>parm </code><strong> HiggsHchg:coup2H1W </strong> |
|---|
| 960 | (<code>default = <strong>1.</strong></code>)<br/> |
|---|
| 961 | The <i>H^+-</i> coupling to a <i>h^0(H_1^0) W^+-</i> pair. |
|---|
| 962 | Is <i>cos(beta - alpha)</i> in the MSSM. |
|---|
| 963 | |
|---|
| 964 | |
|---|
| 965 | <p/><code>parm </code><strong> HiggsHchg:coup2H2W </strong> |
|---|
| 966 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 967 | The <i>H^+-</i> coupling to a <i>H^0(H_2^0) W^+-</i> pair. |
|---|
| 968 | Is <i>sin(beta - alpha)</i> in the MSSM. |
|---|
| 969 | |
|---|
| 970 | |
|---|
| 971 | <p/> |
|---|
| 972 | Another set of parameters are not used in the production stage but |
|---|
| 973 | exclusively for the description of angular distributions in decays. |
|---|
| 974 | |
|---|
| 975 | <p/><code>mode </code><strong> HiggsH1:parity </strong> |
|---|
| 976 | (<code>default = <strong>1</strong></code>; <code>minimum = 0</code>; <code>maximum = 3</code>)<br/> |
|---|
| 977 | possibility to modify angular decay correlations in the decay of a |
|---|
| 978 | <i>h^0(H_1)</i> decay <i>Z^0 Z^0</i> or <i>W^+ W^-</i> to four |
|---|
| 979 | fermions. Currently it does not affect the partial width of the |
|---|
| 980 | channels, which is only based on the above parameters. |
|---|
| 981 | <br/><code>option </code><strong> 0</strong> : isotropic decays. |
|---|
| 982 | <br/><code>option </code><strong> 1</strong> : assuming the <i>h^0(H_1)</i> is a pure scalar |
|---|
| 983 | (CP-even), as in the MSSM. |
|---|
| 984 | <br/><code>option </code><strong> 2</strong> : assuming the <i>h^0(H_1)</i> is a pure pseudoscalar |
|---|
| 985 | (CP-odd). |
|---|
| 986 | <br/><code>option </code><strong> 3</strong> : assuming the <i>h^0(H_1)</i> is a mixture of the two, |
|---|
| 987 | including the CP-violating interference term. The parameter |
|---|
| 988 | <i>eta</i>, see below, sets the strength of the CP-odd admixture, |
|---|
| 989 | with the interference term being proportional to <i>eta</i> |
|---|
| 990 | and the CP-odd one to <i>eta^2</i>. |
|---|
| 991 | |
|---|
| 992 | |
|---|
| 993 | <p/><code>parm </code><strong> HiggsH1:etaParity </strong> |
|---|
| 994 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 995 | The <i>eta</i> value of CP-violation in the |
|---|
| 996 | <code>HiggsSM:parity = 3</code> option. |
|---|
| 997 | |
|---|
| 998 | |
|---|
| 999 | <p/><code>mode </code><strong> HiggsH2:parity </strong> |
|---|
| 1000 | (<code>default = <strong>1</strong></code>; <code>minimum = 0</code>; <code>maximum = 3</code>)<br/> |
|---|
| 1001 | possibility to modify angular decay correlations in the decay of a |
|---|
| 1002 | <i>H^0(H_2)</i> decay <i>Z^0 Z^0</i> or <i>W^+ W^-</i> to four |
|---|
| 1003 | fermions. Currently it does not affect the partial width of the |
|---|
| 1004 | channels, which is only based on the above parameters. |
|---|
| 1005 | <br/><code>option </code><strong> 0</strong> : isotropic decays. |
|---|
| 1006 | <br/><code>option </code><strong> 1</strong> : assuming the <i>H^0(H_2)</i> is a pure scalar |
|---|
| 1007 | (CP-even), as in the MSSM. |
|---|
| 1008 | <br/><code>option </code><strong> 2</strong> : assuming the <i>H^0(H_2)</i> is a pure pseudoscalar |
|---|
| 1009 | (CP-odd). |
|---|
| 1010 | <br/><code>option </code><strong> 3</strong> : assuming the <i>H^0(H_2)</i> is a mixture of the two, |
|---|
| 1011 | including the CP-violating interference term. The parameter |
|---|
| 1012 | <i>eta</i>, see below, sets the strength of the CP-odd admixture, |
|---|
| 1013 | with the interference term being proportional to <i>eta</i> |
|---|
| 1014 | and the CP-odd one to <i>eta^2</i>. |
|---|
| 1015 | |
|---|
| 1016 | |
|---|
| 1017 | <p/><code>parm </code><strong> HiggsH2:etaParity </strong> |
|---|
| 1018 | (<code>default = <strong>0.</strong></code>)<br/> |
|---|
| 1019 | The <i>eta</i> value of CP-violation in the |
|---|
| 1020 | <code>HiggsSM:parity = 3</code> option. |
|---|
| 1021 | |
|---|
| 1022 | |
|---|
| 1023 | <p/><code>mode </code><strong> HiggsA3:parity </strong> |
|---|
| 1024 | (<code>default = <strong>2</strong></code>; <code>minimum = 0</code>; <code>maximum = 3</code>)<br/> |
|---|
| 1025 | possibility to modify angular decay correlations in the decay of a |
|---|
| 1026 | <i>A^0(H_3)</i> decay <i>Z^0 Z^0</i> or <i>W^+ W^-</i> to four |
|---|
| 1027 | fermions. Currently it does not affect the partial width of the |
|---|
| 1028 | channels, which is only based on the above parameters. |
|---|
| 1029 | <br/><code>option </code><strong> 0</strong> : isotropic decays. |
|---|
| 1030 | <br/><code>option </code><strong> 1</strong> : assuming the <i>A^0(H_3)</i> is a pure scalar |
|---|
| 1031 | (CP-even). |
|---|
| 1032 | <br/><code>option </code><strong> 2</strong> : assuming the <i>A^0(H_3)</i> is a pure pseudoscalar |
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| 1033 | (CP-odd), as in the MSSM. |
|---|
| 1034 | <br/><code>option </code><strong> 3</strong> : assuming the <i>A^0(H_3)</i> is a mixture of the two, |
|---|
| 1035 | including the CP-violating interference term. The parameter |
|---|
| 1036 | <i>eta</i>, see below, sets the strength of the CP-odd admixture, |
|---|
| 1037 | with the interference term being proportional to <i>eta</i> |
|---|
| 1038 | and the CP-odd one to <i>eta^2</i>. |
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| 1039 | |
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| 1040 | |
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| 1041 | <p/><code>parm </code><strong> HiggsA3:etaParity </strong> |
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| 1042 | (<code>default = <strong>0.</strong></code>)<br/> |
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| 1043 | The <i>eta</i> value of CP-violation in the |
|---|
| 1044 | <code>HiggsSM:parity = 3</code> option. |
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| 1045 | |
|---|
| 1046 | |
|---|
| 1047 | </body> |
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| 1048 | </html> |
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| 1049 | |
|---|
| 1050 | <!-- Copyright (C) 2012 Torbjorn Sjostrand --> |
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| 1051 | |
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