1 // Author: Dariusz Miskowiec <mailto:d.miskowiec@gsi.de> 2008
3 //=============================================================================
4 // pt-fluctuations analyzer
5 //=============================================================================
11 #include "AliDEvent.h"
13 #include "AliDAnalPtfluc.h"
15 ClassImp(AliDAnalPtfluc)
17 //=============================================================================
18 AliDAnalPtfluc::AliDAnalPtfluc(Char_t *nam, Int_t pid0, Int_t pid1) :
19 AliDAnal(nam), fPid0(pid0), fPid1(pid1)
24 ax[0] = new TAxis(2,-0.5,1.5); ax[0]->SetTitle("trumix");
25 ax[1] = new TAxis(9,0,0.9); ax[1]->SetTitle("centrality");
26 ax[2] = new TAxis(6,-0.5,5.5); ax[2]->SetTitle("n-pt0-pt1-pt00-pt11-pt01");
27 ax[3] = new TAxis(48,-180,180); ax[3]->SetTitle("dphi (deg)");
28 ax[4] = new TAxis(40,-2,2); ax[4]->SetTitle("deta");
29 AliDHN *pair = new AliDHN("pair",5,ax);
30 for (int i=0; i<5; i++) delete ax[i];
33 printf("%s object named %s created\n",ClassName(),GetName());
35 //=============================================================================
36 void AliDAnalPtfluc::Process(Int_t tmr, AliDEvent *ev0, AliDEvent *ev1)
38 // process pairs from one or two (if mixing) events
40 double ptmin=0.1; // GeV
41 double ptmax=1.5; // GeV
45 // mixing-and-rotating-proof centrality
47 double cent = (ev0->Centrality()+ev1->Centrality())/2.0;
51 AliDHN *pair = (AliDHN*) fHistos.At(0);
53 for (int i=0; i<ev0->NParticles(); i++) {
54 if (!ev0->ParticleGood(i,fPid0)) continue;
55 double eta0 = ev0->ParticleEta(i);
56 double phi0 = ev0->ParticlePhi(i);
57 double pt0 = ev0->ParticlePt(i);
58 if (eta0 < etamin) continue;
59 if (eta0 > etamax) continue;
60 if (pt0 < ptmin) continue;
61 if (pt0 > ptmax) continue;
62 for (int j=0; j<ev1->NParticles(); j++) {
63 if (ev0==ev1 && j==i) continue;
64 if (ev0==ev1 && j<i && fPid0==fPid1) continue;
65 if (!ev1->ParticleGood(j,fPid1)) continue;
66 double eta1 = ev1->ParticleEta(j);
67 double phi1 = ev1->ParticlePhi(j);
68 double pt1 = ev1->ParticlePt(j);
69 if (eta1 < etamin) continue;
70 if (eta1 > etamax) continue;
71 if (pt1 < ptmin) continue;
72 if (pt1 > ptmax) continue;
73 double deta = eta1-eta0;
74 double dphi = phi1-phi0;
83 dphi = TVector2::Phi_mpi_pi(dphi);
84 dphi*=TMath::RadToDeg();
85 pair->Fill(tmr, cent, 0, dphi, deta, 1); // number of pairs
86 pair->Fill(tmr, cent, 1, dphi, deta, pt0);
87 pair->Fill(tmr, cent, 2, dphi, deta, pt1);
88 pair->Fill(tmr, cent, 3, dphi, deta, pt0*pt0);
89 pair->Fill(tmr, cent, 4, dphi, deta, pt1*pt1);
90 pair->Fill(tmr, cent, 5, dphi, deta, pt0*pt1);
94 //=============================================================================