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> |
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385 | |
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386 | <flag name="HiggsBSM:qqbar2H2ttbar" default="off"> |
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387 | Scattering <ei>q qbar -> H^0(H_2^0) t tbar</ei> via <ei>t tbar</ei> fusion |
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388 | (or, alternatively put, Higgs radiation off a top line). |
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389 | Warning: unfortunately this process is rather slow, owing to a |
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390 | lengthy cross-section expression and inefficient phase-space selection. |
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391 | Code 1029. |
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392 | |
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393 | <h4>3) <ei>A^0(H_3^0)</ei> processes</h4> |
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394 | |
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395 | <flag name="HiggsBSM:allA3" default="off"> |
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396 | Common switch for the group of <ei>A^0(H_3^0)</ei> production processes. |
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397 | </flag> |
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398 | |
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399 | <flag name="HiggsBSM:ffbar2A3" default="off"> |
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400 | Scattering <ei>f fbar -> A^0(H_3^0)</ei>, where <ei>f</ei> sums over available |
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401 | flavours except top. |
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402 | Code 1041. |
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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 | |
---|