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93ff27bd | 1 | /************************************************************************* |
2 | * Copyright(c) 1998-2008, 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 | /********************************** | |
17 | * create an event and perform * | |
18 | * flow analysis 'on the fly' * | |
19 | * * | |
20 | * authors: Raimond Snellings * | |
21 | * (snelling@nikhef.nl) * | |
22 | * Ante Bilandzic * | |
23 | * (anteb@nikhef.nl) * | |
24 | *********************************/ | |
25 | ||
26 | #include "Riostream.h" | |
27 | #include "TMath.h" | |
28 | #include "TF1.h" | |
29 | #include "TRandom3.h" | |
30 | ||
31 | #include "AliFlowEventSimpleMakerOnTheFly.h" | |
32 | #include "AliFlowEventSimple.h" | |
33 | #include "AliFlowTrackSimple.h" | |
34 | ||
35 | ClassImp(AliFlowEventSimpleMakerOnTheFly) | |
36 | ||
37 | ||
38 | //======================================================================== | |
39 | ||
40 | ||
5b8dccde | 41 | AliFlowEventSimpleMakerOnTheFly::AliFlowEventSimpleMakerOnTheFly(UInt_t iseed): |
42 | fMultiplicityOfRP(0), | |
43 | fMultiplicitySpreadOfRP(0.), | |
44 | fPtFormula(NULL), | |
45 | fPhiFormula(NULL), | |
46 | fMyTRandom3(NULL), | |
47 | fCount(0) | |
93ff27bd | 48 | { |
49 | // constructor | |
5b8dccde | 50 | fMyTRandom3 = new TRandom3(iseed); |
93ff27bd | 51 | } |
52 | ||
53 | ||
54 | //======================================================================== | |
55 | ||
56 | ||
57 | AliFlowEventSimpleMakerOnTheFly::~AliFlowEventSimpleMakerOnTheFly() | |
58 | { | |
59 | // destructor | |
60 | if (fPtFormula) delete fPtFormula; | |
61 | if (fPhiFormula) delete fPhiFormula; | |
5b8dccde | 62 | if (fMyTRandom3) delete fMyTRandom3; |
93ff27bd | 63 | } |
64 | ||
65 | ||
66 | //======================================================================== | |
67 | ||
68 | ||
69 | AliFlowEventSimple* AliFlowEventSimpleMakerOnTheFly::CreateEventOnTheFly() | |
70 | { | |
71 | // method to create event on the fly | |
72 | ||
73 | AliFlowEventSimple* pEvent = new AliFlowEventSimple(fMultiplicityOfRP); | |
74 | ||
5b8dccde | 75 | //reaction plane |
76 | Double_t fMCReactionPlaneAngle = fMyTRandom3->Uniform(0.,TMath::TwoPi()); | |
93ff27bd | 77 | |
78 | // pt: | |
79 | Double_t dPtMin = 0.; // to be improved | |
80 | Double_t dPtMax = 10.; // to be improved | |
81 | ||
82 | fPtFormula = new TF1("PtFormula","[0]*x*TMath::Exp(-x*x)",dPtMin,dPtMax); | |
83 | ||
84 | fPtFormula->SetParName(0,"Multiplicity of RPs"); | |
85 | fPtFormula->SetParameter(0,fMultiplicityOfRP); | |
86 | ||
87 | ||
88 | // phi: | |
89 | Double_t dPhiMin = 0.; // to be improved | |
90 | Double_t dPhiMax = TMath::TwoPi(); // to be improved | |
91 | ||
92 | fPhiFormula = new TF1("phiDistribution","(1)*(1+2.*[0]*TMath::Cos(2*x))",dPhiMin,dPhiMax); | |
93 | ||
94 | Double_t dV2 = 0.044; // to be improved | |
95 | ||
96 | fPhiFormula->SetParName(0,"elliptic flow"); | |
97 | fPhiFormula->SetParameter(0,dV2); | |
98 | ||
99 | ||
100 | // eta: | |
101 | Double_t dEtaMin = -1.; // to be improved | |
102 | Double_t dEtaMax = 1.; // to be improved | |
93ff27bd | 103 | |
93ff27bd | 104 | |
105 | Int_t iGoodTracks = 0; | |
106 | Int_t iSelParticlesRP = 0; | |
107 | Int_t iSelParticlesPOI = 0; | |
108 | for(Int_t i=0;i<fMultiplicityOfRP;i++) { | |
109 | AliFlowTrackSimple* pTrack = new AliFlowTrackSimple(); | |
110 | pTrack->SetPt(fPtFormula->GetRandom()); | |
5b8dccde | 111 | pTrack->SetEta(fMyTRandom3->Uniform(dEtaMin,dEtaMax)); |
112 | pTrack->SetPhi(fPhiFormula->GetRandom()+fMCReactionPlaneAngle); | |
93ff27bd | 113 | pTrack->SetForRPSelection(kTRUE); |
114 | iSelParticlesRP++; | |
115 | pTrack->SetForPOISelection(kTRUE); | |
116 | iSelParticlesPOI++; | |
117 | ||
118 | pEvent->TrackCollection()->Add(pTrack); | |
119 | iGoodTracks++; | |
120 | } | |
121 | ||
122 | pEvent->SetEventNSelTracksRP(iSelParticlesRP); | |
123 | pEvent->SetNumberOfTracks(iGoodTracks);//tracks used either for RP or for POI selection | |
124 | pEvent->SetMCReactionPlaneAngle(fMCReactionPlaneAngle); | |
125 | ||
5b8dccde | 126 | if (!fMCReactionPlaneAngle == 0) cout<<" MC Reaction Plane Angle = "<< fMCReactionPlaneAngle << endl; |
127 | else cout<<" MC Reaction Plane Angle = unknown "<< endl; | |
128 | ||
129 | cout<<" iGoodTracks = "<< iGoodTracks << endl; | |
130 | cout<<" # of RP selected tracks = "<<iSelParticlesRP<<endl; | |
131 | cout<<" # of POI selected tracks = "<<iSelParticlesPOI<<endl; | |
132 | cout << "# " << ++fCount << " events processed" << endl; | |
93ff27bd | 133 | |
134 | return pEvent; | |
135 | ||
136 | } // end of CreateEventOnTheFly() | |
137 | ||
138 | ||
139 |