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1<html>
2<head>
3<title>Compositeness Processes</title>
4<link rel="stylesheet" type="text/css" href="pythia.css"/>
5<link rel="shortcut icon" href="pythia32.gif"/>
6</head>
7<body>
8
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28<form method='post' action='CompositenessProcesses.php'>
29
30<h2>Compositeness Processes</h2>
31
32Compositeness scenarios may give rise to sharp resonances of excited
33quarks and leptons. An excited copy of the first generation is
34implemented, consisting of spin 1/2 particles. The possibility of
35contact interactions between SM fermions is also implemented in the
36context of <i>2 -> 2</i> quark or fermion-lepton scattering.
37
38<p/> 
39Related to excited fermions, the current implementation contains gauge
40interaction production by quark-gluon fusion or lepton-photon fusion
41and contact interaction production by quark-quark or quark-antiquark
42scattering. For both the <i>2 -> 1</i> and <i>2 -> 2</i> processes
43a non-trivial angular dependence is included in the decay, however,
44only decays into gauge bosons are supported, i.e. not decays through
45contact interactions. In additions to the compositness scale and couplings
46listed below, you are expected to change the excited-fermion masses in
47accordance with what is desired. See [<a href="Bibliography.php" target="page">Bau90</a>] for conventions.
48
49<p/>
50The contact interactions are implemented according to [<a href="Bibliography.php" target="page">Eic83</a>].
51The processes include the SM contributions as well as interference.
52For this reason the processes below converge toward the SM equivalents
53when the contact interaction contributions are close to zero, e.g.
54<code>HardQCD:qq2qq</code> and <code>HardQCD:qqbar2qqbarNew</code> in
55the case of quark scattering.
56
57<h3>Excited fermions, production processes</h3>
58
59A few different production processes have been implemented, which normally
60would not overlap and therefore could be run together.
61
62<br/><br/><strong>ExcitedFermion:all</strong>  <input type="radio" name="1" value="on"><strong>On</strong>
63<input type="radio" name="1" value="off" checked="checked"><strong>Off</strong>
64 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
65Common switch for the group of implemented processes that produce an
66excited fermion.
67 
68
69<br/><br/><strong>ExcitedFermion:dg2dStar</strong>  <input type="radio" name="2" value="on"><strong>On</strong>
70<input type="radio" name="2" value="off" checked="checked"><strong>Off</strong>
71 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
72Scatterings <i>d g -> d^*</i>.
73Code 4001.
74 
75
76<br/><br/><strong>ExcitedFermion:ug2uStar</strong>  <input type="radio" name="3" value="on"><strong>On</strong>
77<input type="radio" name="3" value="off" checked="checked"><strong>Off</strong>
78 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
79Scatterings <i>u g -> u^*</i>.
80Code 4002.
81 
82
83<br/><br/><strong>ExcitedFermion:sg2sStar</strong>  <input type="radio" name="4" value="on"><strong>On</strong>
84<input type="radio" name="4" value="off" checked="checked"><strong>Off</strong>
85 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
86Scatterings <i>s g -> s^*</i>.
87Code 4003.
88 
89
90<br/><br/><strong>ExcitedFermion:cg2cStar</strong>  <input type="radio" name="5" value="on"><strong>On</strong>
91<input type="radio" name="5" value="off" checked="checked"><strong>Off</strong>
92 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
93Scatterings <i>c g -> c^*</i>.
94Code 4004.
95 
96
97<br/><br/><strong>ExcitedFermion:bg2bStar</strong>  <input type="radio" name="6" value="on"><strong>On</strong>
98<input type="radio" name="6" value="off" checked="checked"><strong>Off</strong>
99 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
100Scatterings <i>b g -> b^*</i>.
101Code 4005.
102 
103
104<br/><br/><strong>ExcitedFermion:egm2eStar</strong>  <input type="radio" name="7" value="on"><strong>On</strong>
105<input type="radio" name="7" value="off" checked="checked"><strong>Off</strong>
106 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
107Scatterings <i>e gamma -> e^*</i>.
108Code 4011.
109 
110
111<br/><br/><strong>ExcitedFermion:mugm2muStar</strong>  <input type="radio" name="8" value="on"><strong>On</strong>
112<input type="radio" name="8" value="off" checked="checked"><strong>Off</strong>
113 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
114Scatterings <i>mu gamma -> mu^*</i>.
115Code 4013.
116 
117
118<br/><br/><strong>ExcitedFermion:taugm2tauStar</strong>  <input type="radio" name="9" value="on"><strong>On</strong>
119<input type="radio" name="9" value="off" checked="checked"><strong>Off</strong>
120 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
121Scatterings <i>tau gamma -> tau^*</i>.
122Code 4015.
123 
124
125<br/><br/><strong>ExcitedFermion:qq2dStarq</strong>  <input type="radio" name="10" value="on"><strong>On</strong>
126<input type="radio" name="10" value="off" checked="checked"><strong>Off</strong>
127 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
128Scatterings <i>q q(bar) -> d^* q(bar)</i>.
129Code 4021.
130 
131
132<br/><br/><strong>ExcitedFermion:qq2uStarq</strong>  <input type="radio" name="11" value="on"><strong>On</strong>
133<input type="radio" name="11" value="off" checked="checked"><strong>Off</strong>
134 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
135Scatterings <i>q q(bar) -> u^* q(bar)</i>.
136Code 4022.
137 
138
139<br/><br/><strong>ExcitedFermion:qq2sStarq</strong>  <input type="radio" name="12" value="on"><strong>On</strong>
140<input type="radio" name="12" value="off" checked="checked"><strong>Off</strong>
141 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
142Scatterings <i>q q(bar) -> s^* q(bar)</i>.
143Code 4023.
144 
145
146<br/><br/><strong>ExcitedFermion:qq2cStarq</strong>  <input type="radio" name="13" value="on"><strong>On</strong>
147<input type="radio" name="13" value="off" checked="checked"><strong>Off</strong>
148 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
149Scatterings <i>q q(bar) -> c^* q(bar)</i>.
150Code 4024.
151 
152
153<br/><br/><strong>ExcitedFermion:qq2bStarq</strong>  <input type="radio" name="14" value="on"><strong>On</strong>
154<input type="radio" name="14" value="off" checked="checked"><strong>Off</strong>
155 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
156Scatterings <i>q q(bar) -> b^* q(bar)</i>.
157Code 4025.
158 
159
160<br/><br/><strong>ExcitedFermion:qqbar2eStare</strong>  <input type="radio" name="15" value="on"><strong>On</strong>
161<input type="radio" name="15" value="off" checked="checked"><strong>Off</strong>
162 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
163Scatterings <i>q qbar -> e^*+- e^-+</i>.
164Code 4031.
165 
166
167<br/><br/><strong>ExcitedFermion:qqbar2nueStarnue</strong>  <input type="radio" name="16" value="on"><strong>On</strong>
168<input type="radio" name="16" value="off" checked="checked"><strong>Off</strong>
169 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
170Scatterings <i>q qbar -> nu_e^* nu_ebar</i>.
171Code 4032.
172 
173
174<br/><br/><strong>ExcitedFermion:qqbar2muStarmu</strong>  <input type="radio" name="17" value="on"><strong>On</strong>
175<input type="radio" name="17" value="off" checked="checked"><strong>Off</strong>
176 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
177Scatterings <i>q qbar -> mu^*+- mu^-+</i>.
178Code 4033.
179 
180
181<br/><br/><strong>ExcitedFermion:qqbar2numuStarnumu</strong>  <input type="radio" name="18" value="on"><strong>On</strong>
182<input type="radio" name="18" value="off" checked="checked"><strong>Off</strong>
183 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
184Scatterings <i>q qbar -> nu_mu^* nu_mubar</i>.
185Code 4034.
186 
187
188<br/><br/><strong>ExcitedFermion:qqbar2tauStartau</strong>  <input type="radio" name="19" value="on"><strong>On</strong>
189<input type="radio" name="19" value="off" checked="checked"><strong>Off</strong>
190 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
191Scatterings <i>q qbar -> tau^*+- tau^-+</i>.
192Code 4035.
193 
194
195<br/><br/><strong>ExcitedFermion:qqbar2nutauStarnutau</strong>  <input type="radio" name="20" value="on"><strong>On</strong>
196<input type="radio" name="20" value="off" checked="checked"><strong>Off</strong>
197 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
198Scatterings <i>q qbar -> nu_tau^* nu_taubar</i>.
199Code 4036.
200 
201
202<h3>Excited fermions, parameters</h3>
203
204The basic couplings of the model are
205
206<br/><br/><table><tr><td><strong>ExcitedFermion:Lambda </td><td></td><td> <input type="text" name="21" value="1000." size="20"/>  &nbsp;&nbsp;(<code>default = <strong>1000.</strong></code>; <code>minimum = 100.</code>)</td></tr></table>
207Compositeness scale <i>Lambda</i> in GeV.
208 
209
210<br/><br/><table><tr><td><strong>ExcitedFermion:coupF </td><td></td><td> <input type="text" name="22" value="1.0" size="20"/>  &nbsp;&nbsp;(<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
211Strength <i>f</i> of the <i>SU(2)</i> coupling.
212 
213
214<br/><br/><table><tr><td><strong>ExcitedFermion:coupFprime </td><td></td><td> <input type="text" name="23" value="1.0" size="20"/>  &nbsp;&nbsp;(<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
215Strength <i>f'</i> of the <i>U(1)</i> coupling.
216 
217
218<br/><br/><table><tr><td><strong>ExcitedFermion:coupFcol </td><td></td><td> <input type="text" name="24" value="1.0" size="20"/>  &nbsp;&nbsp;(<code>default = <strong>1.0</strong></code>; <code>minimum = 0.0</code>)</td></tr></table>
219Strength <i>f_c</i> of the <i>SU(3)</i> coupling.
220 
221
222<h3>Contact interactions, production processes</h3>
223
224The processes including contact interactions are
225
226<br/><br/><strong>ContactInteractions:QCqq2qq</strong>  <input type="radio" name="25" value="on"><strong>On</strong>
227<input type="radio" name="25" value="off" checked="checked"><strong>Off</strong>
228 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
229Scatterings <i>q q -> q q</i> including contact interactions.
230Code 4201.
231 
232
233<br/><br/><strong>ContactInteractions:QCqqbar2qqbar</strong>  <input type="radio" name="26" value="on"><strong>On</strong>
234<input type="radio" name="26" value="off" checked="checked"><strong>Off</strong>
235 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
236Scatterings <i>q qbar -> q' qbar'</i> including contact interactions.
237Code 4202.
238 
239
240<br/><br/><strong>ContactInteractions:QCffbar2eebar</strong>  <input type="radio" name="27" value="on"><strong>On</strong>
241<input type="radio" name="27" value="off" checked="checked"><strong>Off</strong>
242 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
243Scatterings <i>f fbar -> e- e+</i> including contact interactions.
244Code 4203.
245 
246
247<br/><br/><strong>ContactInteractions:QCffbar2mumubar</strong>  <input type="radio" name="28" value="on"><strong>On</strong>
248<input type="radio" name="28" value="off" checked="checked"><strong>Off</strong>
249 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
250Scatterings <i>f fbar -> mu- mu+</i> including contact interactions.
251Code 4204.
252 
253
254<br/><br/><strong>ContactInteractions:QCffbar2tautaubar</strong>  <input type="radio" name="29" value="on"><strong>On</strong>
255<input type="radio" name="29" value="off" checked="checked"><strong>Off</strong>
256 &nbsp;&nbsp;(<code>default = <strong>off</strong></code>)<br/>
257Scatterings <i>f fbar -> tau- tau+</i> including contact interactions.
258Code 4205.
259 
260
261<h3>Contact interactions, parameters</h3>
262
263<br/><br/><table><tr><td><strong>ContactInteractions:nQuarkNew </td><td></td><td> <input type="text" name="30" value="3" size="20"/>  &nbsp;&nbsp;(<code>default = <strong>3</strong></code>; <code>minimum = 0</code>; <code>maximum = 5</code>)</td></tr></table>
264Number of allowed outgoing new quark flavours in the above
265<i>q qbar -> q' qbar'</i> process. Similar to <i>HardQCD:nQuarkNew</i>
266for the QCD processes.
267 
268
269<br/><br/><table><tr><td><strong>ContactInteractions:Lambda </td><td></td><td> <input type="text" name="31" value="1000." size="20"/>  &nbsp;&nbsp;(<code>default = <strong>1000.</strong></code>; <code>minimum = 100.</code>)</td></tr></table>
270Compositeness scale <i>Lambda</i> in GeV.
271 
272
273<br/><br/><table><tr><td><strong>ContactInteractions:etaLL </td><td>  &nbsp;&nbsp;(<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
274Helicity parameter.
275<br/>
276<input type="radio" name="32" value="1"><strong>1 </strong>: <br/>
277<input type="radio" name="32" value="0" checked="checked"><strong>0 </strong>: <br/>
278<input type="radio" name="32" value="-1"><strong>-1 </strong>: <br/>
279
280<br/><br/><table><tr><td><strong>ContactInteractions:etaRR </td><td>  &nbsp;&nbsp;(<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
281Helicity parameter.
282<br/>
283<input type="radio" name="33" value="1"><strong>1 </strong>: <br/>
284<input type="radio" name="33" value="0" checked="checked"><strong>0 </strong>: <br/>
285<input type="radio" name="33" value="-1"><strong>-1 </strong>: <br/>
286
287<br/><br/><table><tr><td><strong>ContactInteractions:etaLR </td><td>  &nbsp;&nbsp;(<code>default = <strong>0</strong></code>; <code>minimum = -1</code>; <code>maximum = 1</code>)</td></tr></table>
288Helicity parameter.
289<br/>
290<input type="radio" name="34" value="1"><strong>1 </strong>: <br/>
291<input type="radio" name="34" value="0" checked="checked"><strong>0 </strong>: <br/>
292<input type="radio" name="34" value="-1"><strong>-1 </strong>: <br/>
293
294<input type="hidden" name="saved" value="1"/>
295
296<?php
297echo "<input type='hidden' name='filepath' value='".$_GET["filepath"]."'/>"?>
298
299<table width="100%"><tr><td align="right"><input type="submit" value="Save Settings" /></td></tr></table>
300</form>
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481
482?>
483</body>
484</html>
485
486<!-- Copyright (C) 2012 Torbjorn Sjostrand -->
487
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