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9c090011 | 1 | /************************************************************************** |
2 | * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
3 | * * | |
4 | * Author: The ALICE Off-line Project. * | |
5 | * Contributors are mentioned in the code where appropriate. * | |
6 | * * | |
7 | * Permission to use, copy, modify and distribute this software and its * | |
8 | * documentation strictly for non-commercial purposes is hereby granted * | |
9 | * without fee, provided that the above copyright notice appears in all * | |
10 | * copies and that both the copyright notice and this permission notice * | |
11 | * appear in the supporting documentation. The authors make no claims * | |
12 | * about the suitability of this software for any purpose. It is * | |
13 | * provided "as is" without express or implied warranty. * | |
14 | **************************************************************************/ | |
15 | ||
16 | /* $Id: */ | |
17 | ||
18 | //H. Woehri, A. De Falco, INFN Cagliari, April 2007 | |
19 | //an example how to use the AliGenMUONCocktailpp generator | |
20 | //without GEANT simulation of the detector | |
21 | //The macro switches on all decay modes for the resonances, | |
22 | //while for the minimum bias Pythia event we additionally | |
23 | //switch on the muonic decays of pions and Kaons | |
24 | //Its outcome can be further processed by the macro | |
25 | //"fastMUONSim.C | |
26 | ||
27 | #if !defined(__CINT__) || defined(__MAKECINT__) | |
28 | #include "AliGenerator.h" | |
29 | #include "AliRunLoader.h" | |
30 | #include "AliRun.h" | |
31 | #include "AliHeader.h" | |
32 | #include "AliStack.h" | |
33 | #include "AliGenCocktail.h" | |
34 | #include "AliDecayerPythia.h" | |
35 | #include "AliPDG.h" | |
36 | #include "AliGenMUONCocktailpp.h" | |
37 | ||
38 | #include "TParticle.h" | |
39 | #endif | |
40 | ||
41 | AliGenerator* CreateGeneratorMC(Int_t mult); | |
42 | Int_t SetupOutputDirectory(); | |
43 | ||
44 | //the third argument "mult" allows to select at a "pre-trigger" level | |
45 | //events with "mult" muons in the MUON detector's phase space | |
46 | //window, which is defined in the method "CreateGeneratorMC(Int_t mult)" | |
47 | //note that in this routine also a cut on the muon's origin | |
48 | //should be placed in order not to trigger on muons from pi/K decays | |
49 | //that were decayed by Pythia way inside the absorber or in the muon | |
50 | //spectrometer itself | |
51 | void fastMUONGen(Int_t nev = 1, char* filename = "galice.root", Int_t mult = 2) | |
52 | { | |
53 | Int_t runNumber = SetupOutputDirectory(); | |
54 | gAlice->SetRunNumber(runNumber); | |
55 | printf("\n\n\n\nsetting run number to %d\n\n\n\n", runNumber); | |
56 | ||
57 | // Update data base | |
58 | AliPDG::AddParticlesToPdgDataBase(); | |
59 | // | |
60 | AliRunLoader* rl = AliRunLoader::Open(filename,"FASTRUN","recreate"); | |
61 | rl->SetCompressionLevel(2); | |
62 | rl->SetNumberOfEventsPerFile(10000); | |
63 | rl->LoadKinematics("RECREATE"); | |
64 | rl->MakeTree("E"); | |
65 | gAlice->SetRunLoader(rl); | |
66 | // | |
67 | rl->MakeStack(); | |
68 | AliStack* stack = rl->Stack(); | |
69 | AliHeader* header = rl->GetHeader(); | |
70 | // | |
71 | // Create and Initialize Generator | |
72 | AliGenerator *gener = CreateGeneratorMC(mult); | |
73 | gener->SetStack(stack); | |
74 | gener->Init(); | |
75 | // | |
76 | for (int iev = 0; iev < nev; iev++) { | |
77 | ||
78 | if(iev%1000 == 0) printf("Event %d\n", iev); | |
79 | // Initialize event | |
80 | header->Reset(0,iev); | |
81 | rl->SetEventNumber(iev); | |
82 | stack->Reset(); | |
83 | rl->MakeTree("K"); | |
84 | ||
85 | gener->Generate(); | |
86 | /* | |
87 | // Printing | |
88 | Int_t npart = stack->GetNprimary(); | |
89 | for (Int_t part=0; part<npart; part++) { | |
90 | TParticle *MPart = stack->Particle(part); | |
91 | Int_t mpart = MPart->GetPdgCode(); | |
92 | printf("Particle %5d %5d %5d\n", part, mpart, MPart->GetFirstMother()); | |
93 | } | |
94 | */ | |
95 | ||
96 | // Finish event | |
97 | header->SetNprimary(stack->GetNprimary()); | |
98 | header->SetNtrack(stack->GetNtrack()); | |
99 | // I/O | |
100 | // | |
101 | stack->FinishEvent(); | |
102 | header->SetStack(stack); | |
103 | rl->TreeE()->Fill(); | |
104 | rl->WriteKinematics("OVERWRITE"); | |
105 | } // event loop | |
106 | ||
107 | gener->FinishRun(); | |
9c090011 | 108 | rl->WriteHeader("OVERWRITE"); |
109 | gener->Write(); | |
110 | rl->Write(); | |
111 | } | |
112 | //=============================================== | |
113 | AliGenerator* CreateGeneratorMC(Int_t mult) | |
114 | { | |
115 | AliGenMUONCocktailpp* gener = new AliGenMUONCocktailpp(); | |
116 | gener->SetPtRange(0.,100.); | |
117 | gener->SetYRange(-4.,-2.4); | |
118 | gener->SetPhiRange(0., 360.); | |
119 | gener->SetMuonMultiplicity(mult); | |
120 | gener->SetMuonPtCut(0.5); | |
121 | gener->SetMuonThetaRange(171.,178.); | |
122 | gener->SetOrigin(0.,0.,0.); | |
123 | gener->SetSigma(0.,0.,5.); | |
124 | gener->SetVertexSmear(kPerEvent); | |
125 | //for resonances: "kAll" all decay modes are openend | |
126 | gener->SetDecayModeResonance(kAll); | |
127 | //for MC Pythia events: all decays, including muonic decays from pion and Kaons are opened | |
128 | gener->SetDecayModePythia(kAllMuonic); | |
129 | gener->SetMuonOriginCut(-130.); //prevent the trigger muon(s) from decaying after 130 cm | |
130 | AliDecayerPythia* decayer = new AliDecayerPythia(); | |
131 | gener->SetDecayer(decayer); | |
132 | return gener; | |
133 | } | |
134 | //=============================================== | |
135 | Int_t SetupOutputDirectory(){ | |
136 | ||
137 | //Setting up the name for the output directory: | |
138 | static Int_t sseed = 0; // Set 0 to use the current time | |
139 | gRandom->SetSeed(sseed); | |
140 | UInt_t theSeed = gRandom->GetSeed(); | |
141 | Int_t labIndex = 5; //1 subatech, 2 clermont, 3 Torino, 4 Orsay | |
142 | // 5 Cagliari, etc... | |
143 | Int_t runNumber = (theSeed%100000000 + 100000000*labIndex); | |
144 | ||
145 | Char_t name[100]; | |
146 | sprintf(name, "touch run_%d", runNumber); | |
147 | gSystem->Exec(name); | |
148 | ||
149 | return runNumber; | |
150 | } |