Upgrading the macro for the new DCS aliases
[u/mrichter/AliRoot.git] / JETAN / AliJetKineReader.cxx
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99e5fe42 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
83a444b1 16//-------------------------------------------------------------------------
99e5fe42 17// Jet kinematics reader
18// MC reader for jet analysis
83a444b1 19// Author: Andreas Morsch (andreas.morsch@cern.ch)
20//-------------------------------------------------------------------------
99e5fe42 21
22// From root ...
23#include <TClonesArray.h>
24#include <TPDGCode.h>
25#include <TParticle.h>
26#include <TParticlePDG.h>
83a444b1 27//#include <TVector3.h>
99e5fe42 28#include <TLorentzVector.h>
29#include <TSystem.h>
30#include <TDatabasePDG.h>
31#include <TRandom.h>
32// From AliRoot ...
0ffa8579 33#include "AliJet.h"
99e5fe42 34#include "AliJetKineReaderHeader.h"
35#include "AliJetKineReader.h"
36#include "AliRunLoader.h"
37#include "AliStack.h"
0ffa8579 38#include "AliHeader.h"
39#include "AliGenPythiaEventHeader.h"
99e5fe42 40
41ClassImp(AliJetKineReader)
42
1b7d5d7e 43AliJetKineReader::AliJetKineReader():
b45b0c92 44 AliJetReader(),
45 fRunLoader(0x0),
46 fAliHeader(0x0)
99e5fe42 47{
1b7d5d7e 48 // Default constructor
99e5fe42 49}
50
51//____________________________________________________________________________
52
53AliJetKineReader::~AliJetKineReader()
54{
55 // Destructor
0ffa8579 56 delete fAliHeader;
99e5fe42 57}
58
59//____________________________________________________________________________
60
61void AliJetKineReader::OpenInputFiles()
62{
83a444b1 63 // Opens the input file using the run loader
64 const char* dirName = fReaderHeader->GetDirectory();
65 char path[256];
66 sprintf(path, "%s/galice.root",dirName);
67 fRunLoader = AliRunLoader::Open(path);
68 fRunLoader->LoadKinematics();
69 fRunLoader->LoadHeader();
70
71 // get number of events
72 Int_t nMax = fRunLoader->GetNumberOfEvents();
73 printf("\nTotal number of events = %d", nMax);
74
99e5fe42 75 // set number of events in header
83a444b1 76 if (fReaderHeader->GetLastEvent() == -1)
77 fReaderHeader->SetLastEvent(nMax);
78 else {
79 Int_t nUsr = fReaderHeader->GetLastEvent();
80 fReaderHeader->SetLastEvent(TMath::Min(nMax, nUsr));
81 }
99e5fe42 82}
83
84//____________________________________________________________________________
85
0ffa8579 86Bool_t AliJetKineReader::FillMomentumArray(Int_t event)
99e5fe42 87{
83a444b1 88 // Fill momentum array for event
89
90 Int_t goodTrack = 0;
91 // Clear array
92 ClearArray();
93 // Get event from runloader
94 fRunLoader->GetEvent(event);
95 // Get the stack
96 AliStack* stack = fRunLoader->Stack();
97 // Number of primaries
98 Int_t nt = stack->GetNprimary();
99
100 // Get cuts set by user and header
101 Double_t ptMin = ((AliJetKineReaderHeader*) fReaderHeader)->GetPtCut();
102 Float_t etaMin = fReaderHeader->GetFiducialEtaMin();
103 Float_t etaMax = fReaderHeader->GetFiducialEtaMax();
104 fAliHeader = fRunLoader->GetHeader();
105
106 // temporary storage of signal and cut flags
107 Int_t* sflag = new Int_t[nt];
108 Int_t* cflag = new Int_t[nt];
109
110 TLorentzVector p4;
111 // Loop over particles
112 for (Int_t it = 0; it < nt; it++) {
113 TParticle *part = stack->Particle(it);
114 Int_t status = part->GetStatusCode();
115 Int_t pdg = TMath::Abs(part->GetPdgCode());
116 Float_t pt = part->Pt();
117
118 // Skip non-final state particles, neutrinos
119 // and particles with pt < pt_min
120 if ((status != 1)
121 || (pdg == 12 || pdg == 14 || pdg == 16)) continue;
122
123 Float_t p = part->P();
124 Float_t p0 = p;
125 Float_t eta = part->Eta();
126 Float_t phi = part->Phi();
127
128 // Fast simulation of TPC if requested
129 if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimTPC()) {
130 // Charged particles only
131 Float_t charge =
132 TDatabasePDG::Instance()->GetParticle(pdg)->Charge();
133 if (charge == 0) continue;
134 // Simulate efficiency
135 if (!Efficiency(p0, eta, phi)) continue;
136 // Simulate resolution
137 p = SmearMomentum(4, p0);
138 } // End fast TPC
139
140 // Fast simulation of EMCAL if requested
141 if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimEMCAL()) {
142 Float_t charge =
143 TDatabasePDG::Instance()->GetParticle(pdg)->Charge();
144 // Charged particles only
145 if (charge != 0){
146 // Simulate efficiency
147 if (!Efficiency(p0, eta, phi)) continue;
148 // Simulate resolution
149 p = SmearMomentum(4, p0);
150 } // end "if" charged particles
151 // Neutral particles (exclude K0L, n, nbar)
152 if (pdg == kNeutron || pdg == kK0Long) continue;
153 } // End fast EMCAL
154
83a444b1 155 // Fill momentum array
156 Float_t r = p/p0;
157 Float_t px = r * part->Px();
158 Float_t py = r * part->Py();
159 Float_t pz = r * part->Pz();
160 Float_t m = part->GetMass();
161 Float_t e = TMath::Sqrt(px * px + py * py + pz * pz + m * m);
162 p4 = TLorentzVector(px, py, pz, e);
163 if ( (p4.Eta()>etaMax) || (p4.Eta()<etaMin)) continue;
164 new ((*fMomentumArray)[goodTrack]) TLorentzVector(p4);
165
166 // all tracks are signal ... ?
167 sflag[goodTrack]=1;
168 cflag[goodTrack]=0;
169 if (pt > ptMin) cflag[goodTrack]=1; // track surviving pt cut
170 goodTrack++;
99e5fe42 171 }
83a444b1 172
173 // set the signal flags
174 fSignalFlag.Set(goodTrack,sflag);
175 fCutFlag.Set(goodTrack,cflag);
176 printf("\nIn event %d, number of good tracks %d \n", event, goodTrack);
0ffa8579 177 return kTRUE;
99e5fe42 178}
179
180
48bb52d8 181Float_t AliJetKineReader::SmearMomentum(Int_t ind, Float_t p)
182{
83a444b1 183 // The relative momentum error, i.e.
184 // (delta p)/p = sqrt (a**2 + (b*p)**2) * 10**-2,
185 // where typically a = 0.75 and b = 0.16 - 0.24 depending on multiplicity
186 // (the lower value is for dn/d(eta) about 2000, and the higher one for 8000)
187 //
188 // If we include information from TRD, b will be a factor 2/3 smaller.
189 //
190 // ind = 1: high multiplicity
191 // ind = 2: low multiplicity
192 // ind = 3: high multiplicity + TRD
193 // ind = 4: low multiplicity + TRD
194
195 Float_t pSmeared;
196 Float_t a = 0.75;
197 Float_t b = 0.12;
198
199 if (ind == 1) b = 0.12;
200 if (ind == 2) b = 0.08;
201 if (ind == 3) b = 0.12;
202 if (ind == 4) b = 0.08;
203
204 Float_t sigma = p * TMath::Sqrt(a * a + b * b * p * p)*0.01;
205 pSmeared = p + gRandom->Gaus(0., sigma);
206 return pSmeared;
48bb52d8 207}
83a444b1 208
209
48bb52d8 210Bool_t AliJetKineReader::Efficiency(Float_t p, Float_t /*eta*/, Float_t phi)
211{
83a444b1 212 // Fast simulation of geometrical acceptance and tracking efficiency
213
214 // Tracking
215 Float_t eff = 0.99;
216 if (p < 0.5) eff -= (0.5-p)*0.2/0.3;
217 // Geometry
218 if (p > 0.5) {
219 phi *= 180. / TMath::Pi();
220 // Sector number 0 - 17
221 Int_t isec = Int_t(phi / 20.);
222 // Sector centre
223 Float_t phi0 = isec * 20. + 10.;
224 Float_t phir = TMath::Abs(phi-phi0);
225 // 2 deg of dead space
226 if (phir > 9.) eff = 0.;
227 }
228
229 if (gRandom->Rndm() > eff) {
230 return kFALSE;
231 } else {
232 return kTRUE;
233 }
234
48bb52d8 235}
236
0ffa8579 237Bool_t AliJetKineReader::GetGenJets(AliJet* genJets)
238{
239 // Get generated jets from mc header
240 AliHeader* alih = GetAliHeader();
241 if (alih == 0) return kFALSE;
242 AliGenEventHeader * genh = alih->GenEventHeader();
243 if (genh == 0) return kFALSE;
244 Int_t nj =((AliGenPythiaEventHeader*)genh)->NTriggerJets();
245 Int_t* m = new Int_t[nj];
246 Int_t* k = new Int_t[nj];
247 for (Int_t i=0; i< nj; i++) {
248 Float_t p[4];
249 ((AliGenPythiaEventHeader*)genh)->TriggerJet(i,p);
250 genJets->AddJet(p[0],p[1],p[2],p[3]);
251 m[i]=1;
252 k[i]=i;
253 }
254 genJets->SetNinput(nj);
255 genJets->SetMultiplicities(m);
256 genJets->SetInJet(k);
257 return kTRUE;
258}