1 /*************************************************************************
2 * Copyright(c) 1998-2048, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 // Author: Dariusz Miskowiec <mailto:d.miskowiec@gsi.de> 2008
18 //=============================================================================
19 // high-pt correlation analyzer
20 // Loop over pairs and fill pair histograms. The first particle is always
21 // taken from ev0 and the second from ev1 so for ev0=ev1 one is getting true
22 // pairs, otherwise mixed ones. Overlaps a bit with AliUnicorAnalCorrel.
23 //=============================================================================
28 #include "AliUnicorEvent.h"
29 #include "AliUnicorHN.h"
30 #include "AliUnicorAnalHighpt.h"
32 ClassImp(AliUnicorAnalHighpt)
34 //=============================================================================
35 AliUnicorAnalHighpt::AliUnicorAnalHighpt(const char *nam, Double_t emi, Double_t ema, Int_t pid0,
36 Int_t pid1): AliUnicorAnal(nam), fPid0(pid0), fPid1(pid1)
39 // emi and ema define the rapidity range for histogram
41 Double_t ewi = ema-emi; // width of the pseudorapidity range
42 double pi = TMath::Pi();
44 ax[0] = new TAxis(2,-0.5,1.5); ax[0]->SetTitle("trumix");
45 ax[1] = new TAxis(2,-0.5,1.5); ax[1]->SetTitle("weigth"); // 1 or ass pt
46 ax[2] = new TAxis(5,0,0.5); ax[2]->SetTitle("centrality");
47 ax[3] = new TAxis(3,emi,ema); ax[3]->SetTitle("trig eta");
48 ax[4] = new TAxis(1,-pi,pi); ax[4]->SetTitle("trig phi"); // w.r.t. RP
49 // ax[4] = new TAxis(8,-pi,pi); ax[4]->SetTitle("trig phi"); // w.r.t. RP
50 double a5[]={0,2.5,3,4,6,8,10,15,20,30,50,100};
51 ax[5] = new TAxis(11,a5); ax[5]->SetTitle("trig pt (GeV)");
52 ax[6] = new TAxis(20,-ewi,ewi); ax[6]->SetTitle("ass eta - trig eta");
53 ax[7] = new TAxis(36,-1,2*pi-1); ax[7]->SetTitle("ass phi - trig phi");
54 ax[8] = new TAxis(10,0,1); ax[8]->SetTitle("ass pt / trig pt");
56 AliUnicorHN *pair = new AliUnicorHN("pair",9,ax);
57 for (int i=0; i<9; i++) delete ax[i];
60 printf("%s object named %s created\n",ClassName(),GetName());
62 //=============================================================================
63 void AliUnicorAnalHighpt::Process(const AliUnicorEvent * const ev0, const AliUnicorEvent * const ev1)
65 // process pairs from one or two (if mixing) events
66 // true pairs are within the triangle (j<i), mixed - all
68 // mixing-proof centrality and reaction plane angle
70 double cent = (ev0->Centrality()+ev1->Centrality())/2.0;
71 double q0x=0,q0y=0,q1x=0,q1y=0;
74 double rpphi = atan2(q0y+q1y,q0x+q1x);
78 int tmr = (ev0!=ev1); // 0 for true, 1 for mixed
79 AliUnicorHN *pair = (AliUnicorHN*) fHistos.At(0);
80 for (int i=0; i<ev0->NParticles(); i++) {
81 if (!ev0->ParticleGood(i,fPid0)) continue;
82 double eta0 = ev0->ParticleEta(i);
83 double phi0 = ev0->ParticlePhi(i);
84 double pt0 = ev0->ParticlePt(i);
85 for (int j=0; j<ev1->NParticles(); j++) {
86 if (ev0==ev1 && j==i) continue; // same particle
87 if (ev0==ev1 && j<i && fPid0==fPid1) continue;
88 if (!ev1->ParticleGood(j,fPid1)) continue;
89 double eta1 = ev1->ParticleEta(j);
90 double phi1 = ev1->ParticlePhi(j);
91 double pt1 = ev1->ParticlePt(j);
92 int order = (pt0>pt1);
93 double deta = order*(eta1-eta0); // ass-trig
94 double dphi = order*(phi1-phi0);
95 dphi = TVector2::Phi_mpi_pi(dphi);
96 if (dphi<-1) dphi+=2*TMath::Pi();
97 double relphi = TVector2::Phi_mpi_pi(phi0-rpphi); // wrt. reaction plane
98 pair->Fill((double)tmr,0.0,cent,eta0,relphi,pt0,deta,dphi,pt1/pt0,1.0); // number of pairs
99 pair->Fill((double)tmr,1.0,cent,eta0,relphi,pt0,deta,dphi,pt1/pt0,pt1); // weigthed with ass pt
103 //=============================================================================