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