3 <title>Compositeness Processes</title>
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30 <h2>Compositeness Processes</h2>
32 Compositeness scenarios may give rise to sharp resonances of excited
33 quarks and leptons. An excited copy of the first generation is
34 implemented, consisting of spin 1/2 particles. The possibility of
35 contact interactions between quarks is also implemented in the context
36 of <i>2 -> 2</i> quark scattering.
39 Related to excited fermions, the current implementation contains gauge
40 interaction production by quark-gluon fusion or lepton-photon fusion
41 and contact interaction production by quark-quark or quark-antiquark
42 scattering. In additions to the compositness scale and couplings listed
43 below, you are expected to change the excited-fermion masses in accordance
44 with what is desired. See [<a href="Bibliography.php" target="page">Bau90</a>] for conventions.
47 A non-trivial angular dependence is included in the decay for the
48 <i>2 -> 1</i> processes, but has not been included for the
52 The quark contact interactions are implemented according to
53 [<a href="Bibliography.php" target="page">Eic83</a>]. The processes include the QCD contributions
54 as well as interference. For this reason the two processes
55 below converge toward, <code>HardQCD:qq2qq</code> and
56 <code>HardQCD:qqbar2qqbarNew</code>, when the contact interaction
57 contributions are close to zero.
59 <h3>Excited fermions, production processes</h3>
61 A few different production processes have been implemented, which normally
62 would not overlap and therefore could be run together.
64 <br/><br/><strong>ExcitedFermion:all</strong> <input type="radio" name="1" value="on"><strong>On</strong>
65 <input type="radio" name="1" value="off" checked="checked"><strong>Off</strong>
66 (<code>default = <strong>off</strong></code>)<br/>
67 Common switch for the group of implemented processes that produce an
71 <br/><br/><strong>ExcitedFermion:dg2dStar</strong> <input type="radio" name="2" value="on"><strong>On</strong>
72 <input type="radio" name="2" value="off" checked="checked"><strong>Off</strong>
73 (<code>default = <strong>off</strong></code>)<br/>
74 Scatterings <i>d g -> d^*</i>.
78 <br/><br/><strong>ExcitedFermion:ug2uStar</strong> <input type="radio" name="3" value="on"><strong>On</strong>
79 <input type="radio" name="3" value="off" checked="checked"><strong>Off</strong>
80 (<code>default = <strong>off</strong></code>)<br/>
81 Scatterings <i>u g -> u^*</i>.
85 <br/><br/><strong>ExcitedFermion:sg2sStar</strong> <input type="radio" name="4" value="on"><strong>On</strong>
86 <input type="radio" name="4" value="off" checked="checked"><strong>Off</strong>
87 (<code>default = <strong>off</strong></code>)<br/>
88 Scatterings <i>s g -> s^*</i>.
92 <br/><br/><strong>ExcitedFermion:cg2cStar</strong> <input type="radio" name="5" value="on"><strong>On</strong>
93 <input type="radio" name="5" value="off" checked="checked"><strong>Off</strong>
94 (<code>default = <strong>off</strong></code>)<br/>
95 Scatterings <i>c g -> c^*</i>.
99 <br/><br/><strong>ExcitedFermion:bg2bStar</strong> <input type="radio" name="6" value="on"><strong>On</strong>
100 <input type="radio" name="6" value="off" checked="checked"><strong>Off</strong>
101 (<code>default = <strong>off</strong></code>)<br/>
102 Scatterings <i>b g -> b^*</i>.
106 <br/><br/><strong>ExcitedFermion:egm2eStar</strong> <input type="radio" name="7" value="on"><strong>On</strong>
107 <input type="radio" name="7" value="off" checked="checked"><strong>Off</strong>
108 (<code>default = <strong>off</strong></code>)<br/>
109 Scatterings <i>e gamma -> e^*</i>.
113 <br/><br/><strong>ExcitedFermion:mugm2muStar</strong> <input type="radio" name="8" value="on"><strong>On</strong>
114 <input type="radio" name="8" value="off" checked="checked"><strong>Off</strong>
115 (<code>default = <strong>off</strong></code>)<br/>
116 Scatterings <i>mu gamma -> mu^*</i>.
120 <br/><br/><strong>ExcitedFermion:taugm2tauStar</strong> <input type="radio" name="9" value="on"><strong>On</strong>
121 <input type="radio" name="9" value="off" checked="checked"><strong>Off</strong>
122 (<code>default = <strong>off</strong></code>)<br/>
123 Scatterings <i>tau gamma -> tau^*</i>.
127 <br/><br/><strong>ExcitedFermion:qq2dStarq</strong> <input type="radio" name="10" value="on"><strong>On</strong>
128 <input type="radio" name="10" value="off" checked="checked"><strong>Off</strong>
129 (<code>default = <strong>off</strong></code>)<br/>
130 Scatterings <i>q q(bar) -> d^* q(bar)</i>.
134 <br/><br/><strong>ExcitedFermion:qq2uStarq</strong> <input type="radio" name="11" value="on"><strong>On</strong>
135 <input type="radio" name="11" value="off" checked="checked"><strong>Off</strong>
136 (<code>default = <strong>off</strong></code>)<br/>
137 Scatterings <i>q q(bar) -> u^* q(bar)</i>.
141 <br/><br/><strong>ExcitedFermion:qq2sStarq</strong> <input type="radio" name="12" value="on"><strong>On</strong>
142 <input type="radio" name="12" value="off" checked="checked"><strong>Off</strong>
143 (<code>default = <strong>off</strong></code>)<br/>
144 Scatterings <i>q q(bar) -> s^* q(bar)</i>.
148 <br/><br/><strong>ExcitedFermion:qq2cStarq</strong> <input type="radio" name="13" value="on"><strong>On</strong>
149 <input type="radio" name="13" value="off" checked="checked"><strong>Off</strong>
150 (<code>default = <strong>off</strong></code>)<br/>
151 Scatterings <i>q q(bar) -> c^* q(bar)</i>.
155 <br/><br/><strong>ExcitedFermion:qq2bStarq</strong> <input type="radio" name="14" value="on"><strong>On</strong>
156 <input type="radio" name="14" value="off" checked="checked"><strong>Off</strong>
157 (<code>default = <strong>off</strong></code>)<br/>
158 Scatterings <i>q q(bar) -> b^* q(bar)</i>.
162 <br/><br/><strong>ExcitedFermion:qqbar2eStare</strong> <input type="radio" name="15" value="on"><strong>On</strong>
163 <input type="radio" name="15" value="off" checked="checked"><strong>Off</strong>
164 (<code>default = <strong>off</strong></code>)<br/>
165 Scatterings <i>q qbar -> e^*+- e^-+</i>.
169 <br/><br/><strong>ExcitedFermion:qqbar2nueStarnue</strong> <input type="radio" name="16" value="on"><strong>On</strong>
170 <input type="radio" name="16" value="off" checked="checked"><strong>Off</strong>
171 (<code>default = <strong>off</strong></code>)<br/>
172 Scatterings <i>q qbar -> nu_e^* nu_ebar</i>.
176 <br/><br/><strong>ExcitedFermion:qqbar2muStarmu</strong> <input type="radio" name="17" value="on"><strong>On</strong>
177 <input type="radio" name="17" value="off" checked="checked"><strong>Off</strong>
178 (<code>default = <strong>off</strong></code>)<br/>
179 Scatterings <i>q qbar -> mu^*+- mu^-+</i>.
183 <br/><br/><strong>ExcitedFermion:qqbar2numuStarnumu</strong> <input type="radio" name="18" value="on"><strong>On</strong>
184 <input type="radio" name="18" value="off" checked="checked"><strong>Off</strong>
185 (<code>default = <strong>off</strong></code>)<br/>
186 Scatterings <i>q qbar -> nu_mu^* nu_mubar</i>.
190 <br/><br/><strong>ExcitedFermion:qqbar2tauStartau</strong> <input type="radio" name="19" value="on"><strong>On</strong>
191 <input type="radio" name="19" value="off" checked="checked"><strong>Off</strong>
192 (<code>default = <strong>off</strong></code>)<br/>
193 Scatterings <i>q qbar -> tau^*+- tau^-+</i>.
197 <br/><br/><strong>ExcitedFermion:qqbar2nutauStarnutau</strong> <input type="radio" name="20" value="on"><strong>On</strong>
198 <input type="radio" name="20" value="off" checked="checked"><strong>Off</strong>
199 (<code>default = <strong>off</strong></code>)<br/>
200 Scatterings <i>q qbar -> nu_tau^* nu_taubar</i>.
204 <h3>Excited fermions, parameters</h3>
206 The basic couplings of the model are
208 <br/><br/><table><tr><td><strong>ExcitedFermion:Lambda </td><td></td><td> <input type="text" name="21" value="1000." size="20"/> (<code>default = <strong>1000.</strong></code>; <code>minimum = 100.</code>)</td></tr></table>
209 Compositeness scale <i>Lambda</i> in GeV.
212 <br/><br/><table><tr><td><strong>ExcitedFermion:coupF </td><td></td><td> <input type="text" name="22" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
213 Strength <i>f</i> of the <i>SU(2)</i> coupling.
216 <br/><br/><table><tr><td><strong>ExcitedFermion:coupFprime </td><td></td><td> <input type="text" name="23" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
217 Strength <i>f'</i> of the <i>U(1)</i> coupling.
220 <br/><br/><table><tr><td><strong>ExcitedFermion:coupFcol </td><td></td><td> <input type="text" name="24" value="1.0" size="20"/> (<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
221 Strength <i>f_c</i> of the <i>SU(3)</i> coupling.
224 <h3>Contact interactions, production processes</h3>
226 The processes including quark contact interactions are
228 <br/><br/><strong>ContactInteractions:QCqq2qq</strong> <input type="radio" name="25" value="on"><strong>On</strong>
229 <input type="radio" name="25" value="off" checked="checked"><strong>Off</strong>
230 (<code>default = <strong>off</strong></code>)<br/>
231 Scatterings <i>q q -> q q</i> including contact interactions.
235 <br/><br/><strong>ContactInteractions:QCqqbar2qqbar</strong> <input type="radio" name="26" value="on"><strong>On</strong>
236 <input type="radio" name="26" value="off" checked="checked"><strong>Off</strong>
237 (<code>default = <strong>off</strong></code>)<br/>
238 Scatterings <i>q qbar -> q' qbar'</i> including contact interactions.
242 <h3>Contact interactions, parameters</h3>
244 <br/><br/><table><tr><td><strong>ContactInteractions:nQuarkNew </td><td></td><td> <input type="text" name="27" value="3" size="20"/> (<code>default = <strong>3</strong></code>; <code>minimum = 0</code>; <code>maximum = 5</code>)</td></tr></table>
245 Number of allowed outgoing new quark flavours in the above
246 <i>q qbar -> q' qbar'</i> process. Similar to <i>HardQCD:nQuarkNew</i>
247 for the QCD processes.
250 <br/><br/><table><tr><td><strong>ContactInteractions:Lambda </td><td></td><td> <input type="text" name="28" value="1000." size="20"/> (<code>default = <strong>1000.</strong></code>; <code>minimum = 100.</code>)</td></tr></table>
251 Compositeness scale <i>Lambda</i> in GeV.
254 <br/><br/><table><tr><td><strong>ContactInteractions:etaLL </td><td> (<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
257 <input type="radio" name="29" value="1"><strong>1 </strong>: <br/>
258 <input type="radio" name="29" value="0" checked="checked"><strong>0 </strong>: <br/>
259 <input type="radio" name="29" value="-1"><strong>-1 </strong>: <br/>
261 <br/><br/><table><tr><td><strong>ContactInteractions:etaRR </td><td> (<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
264 <input type="radio" name="30" value="1"><strong>1 </strong>: <br/>
265 <input type="radio" name="30" value="0" checked="checked"><strong>0 </strong>: <br/>
266 <input type="radio" name="30" value="-1"><strong>-1 </strong>: <br/>
268 <br/><br/><table><tr><td><strong>ContactInteractions:etaLR </td><td> (<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
271 <input type="radio" name="31" value="1"><strong>1 </strong>: <br/>
272 <input type="radio" name="31" value="0" checked="checked"><strong>0 </strong>: <br/>
273 <input type="radio" name="31" value="-1"><strong>-1 </strong>: <br/>
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