3 <title>Process Selection</title>
4 <link rel="stylesheet" type="text/css" href="pythia.css"/>
5 <link rel="shortcut icon" href="pythia32.gif"/>
9 <script language=javascript type=text/javascript>
10 function stopRKey(evt) {
11 var evt = (evt) ? evt : ((event) ? event : null);
12 var node = (evt.target) ? evt.target :((evt.srcElement) ? evt.srcElement : null);
13 if ((evt.keyCode == 13) && (node.type=="text"))
17 document.onkeypress = stopRKey;
20 if($_POST['saved'] == 1) {
21 if($_POST['filepath'] != "files/") {
22 echo "<font color='red'>SETTINGS SAVED TO FILE</font><br/><br/>"; }
24 echo "<font color='red'>NO FILE SELECTED YET.. PLEASE DO SO </font><a href='SaveSettings.php'>HERE</a><br/><br/>"; }
28 <form method='post' action='ProcessSelection.php'>
30 <h2>Process Selection</h2>
32 There is no way PYTHIA could contain all processes of interest,
33 neither in terms of potential physics topics nor in terms of
34 high-multiplicity final states. What exists is a reasonably
35 complete setup of all <i>2 -> 1</i> and <i>2 -> 2</i>
36 processes within the Standard Model, plus some examples of
37 processes beyond that, again for low multiplicities. Combined with
38 the PYTHIA parton showers, this should be enough to get a flying
39 start in the study of many physics scenarios.
40 Other processes could be fed in via the
41 <?php $filepath = $_GET["filepath"];
42 echo "<a href='LesHouchesAccord.php?filepath=".$filepath."' target='page'>";?>Les Houches Accord</a>
43 or be implemented as a
44 <?php $filepath = $_GET["filepath"];
45 echo "<a href='SemiInternalProcesses.php?filepath=".$filepath."' target='page'>";?>Semi-Internal Process</a>.
46 In the latter case the existing processes would act as obvious
50 By default all processes are switched off. You should switch on
51 those you want to simulate. This may be done at two (occasionally
52 three) levels, either for each individual process or for a group of
53 processes. That is, a process is going to be generated either if its
54 own flag or its group flag is on. There is no built-in construction
55 to switch on a group and then switch off a few of its members.
58 Each process is assigned an integer code. This code is not used in
59 the internal administration of events (so having the same code for
60 two completely different processes would not be a problem), but only
61 intended to allow a simpler user separation of different processes.
62 Also the process name is available, as a string.
65 To ease navigation, the list of processes has been split into several
66 separate pages, by main topic. The classification is hopefully
67 intuitive, but by no means unambiguous. For instance, essentially
68 all processes involve QCD, so the "QCD processes" are the ones that
69 only involve QCD. (And also that is not completely true, once one
70 includes all that may happen in multiple interactions.) On these
71 separate pages also appear the settings that are completely local
72 to that particular process class, but not the ones that have a
75 <h3><?php $filepath = $_GET["filepath"];
76 echo "<a href='QCDProcesses.php?filepath=".$filepath."' target='page'>";?>QCD Processes</a></h3>
78 QCD processes fall in two main categories: soft and hard. The soft ones
79 contain elastic, diffractive and "minimum-bias" events, together
80 covering the total cross section. Hard processea are the normal
81 <i>2 -> 2</i> ones, including charm and bottom production.
82 <br/>Reserved code range: 101 - 199.
84 <h3><?php $filepath = $_GET["filepath"];
85 echo "<a href='ElectroweakProcesses.php?filepath=".$filepath."' target='page'>";?>Electroweak Processes</a></h3>
87 Prompt-photon, <i>gamma^*/Z^0</i> and <i>W^+-</i> production,
88 plus a few processes with <i>t</i>-channel boson exchange.
89 <br/>Reserved code range: 201 - 299.
91 <h3><?php $filepath = $_GET["filepath"];
92 echo "<a href='OniaProcesses.php?filepath=".$filepath."' target='page'>";?>Onia Processes</a></h3>
94 Colour singlet and octet production of charmonium and bottomonium.
95 <br/>Reserved code range: 401 - 499 for charmonium and
96 501 - 599 for bottomonium.
98 <h3><?php $filepath = $_GET["filepath"];
99 echo "<a href='TopProcesses.php?filepath=".$filepath."' target='page'>";?>Top Processes</a></h3>
101 Top production, singly or doubly.
102 <br/>Reserved code range: 601 - 699.
104 <h3><?php $filepath = $_GET["filepath"];
105 echo "<a href='FourthGenerationProcesses.php?filepath=".$filepath."' target='page'>";?>Fourth-Generation
108 Production of hypothetical fourth-generation fermions.
109 <br/>Reserved code range: 801 - 899.
111 <h3><?php $filepath = $_GET["filepath"];
112 echo "<a href='HiggsProcesses.php?filepath=".$filepath."' target='page'>";?>Higgs Processes</a></h3>
114 Higgs production, within or beyond the Standard Model.
115 See section on Left-Right-Symmetry processes for doubly charged Higgses.
116 <br/>Reserved code range: 901 - 999 for a Standard Model Higgs
117 and 1001 - 1199 for MSSM Higgses.
119 <h3><?php $filepath = $_GET["filepath"];
120 echo "<a href='SUSYProcesses.php?filepath=".$filepath."' target='page'>";?>SUSY Processes</a></h3>
122 Production of supersymmetric particles, currently barely begun.
123 <br/>Reserved code range: 1001 - 2999. (Whereof 1001 - 1199
124 for Higgses; see above.)
126 <h3><?php $filepath = $_GET["filepath"];
127 echo "<a href='NewGaugeBosonProcesses.php?filepath=".$filepath."' target='page'>";?>New-Gauge-Boson
130 Production of new gauge bosons such as <i>Z'</i> and <i>W'</i>.
131 <br/>Reserved code range: 3001 - 3099.
133 <h3><?php $filepath = $_GET["filepath"];
134 echo "<a href='LeftRightSymmetryProcesses.php?filepath=".$filepath."' target='page'>";?>Left-Right-Symmetry
137 Production of righthanded <i>Z_R</i> and <i>W_R</i> bosons and of
138 doubly charged Higgses.
139 <br/>Reserved code range: 3101 - 3199.
141 <h3><?php $filepath = $_GET["filepath"];
142 echo "<a href='LeptoquarkProcesses.php?filepath=".$filepath."' target='page'>";?>Leptoquark Processes</a></h3>
144 Production of a simple scalar leptoquark state.
145 <br/>Reserved code range: 3201 - 3299.
147 <h3><?php $filepath = $_GET["filepath"];
148 echo "<a href='CompositenessProcesses.php?filepath=".$filepath."' target='page'>";?>Compositeness Processes</a></h3>
150 Production of excited fermion states and contact-interaction modification
151 to interactions between fermions (excluding technicolor; see below).
152 <br/>Reserved code range: 4001 - 4099.
154 <h3>Technicolor Processes</h3>
156 Production of technicolor particles and modifications of QCD processes
157 by technicolor interactions. Does not exist yet.
158 <br/>Reserved code range: 4101 - 4199.
160 <h3><?php $filepath = $_GET["filepath"];
161 echo "<a href='HiddenValleyProcesses.php?filepath=".$filepath."' target='page'>";?>Hidden Valley Processes</a></h3>
162 A scenario for the pair prodiction of new particles with couplings
163 under a new gauge group, with invisible gauge bosons. Radiation of
164 these gauge bosons is included in the standard final-state parton
166 <br/>Reserved code range: 4901 - 4999.
168 <h3><?php $filepath = $_GET["filepath"];
169 echo "<a href='ExtraDimensionalProcesses.php?filepath=".$filepath."' target='page'>";?>Extra-Dimensional
172 A vast area, here represented by the production of a Randall-Sundrum
173 excited graviton state and a Kaluza-Klein gluon, a Kaluza-Klein tower
174 of <i>gamma/Z^0</i> excitations in one TeV^- sized extra dimension,
175 several Large Extra Dimension processes, and a few related Unparticle
177 <br/>Reserved code range: 5001 - 5099.
182 <!-- Copyright (C) 2010 Torbjorn Sjostrand -->