Fixes to FastJetFinder (added c'tors) and added possibility to run FJ on Kinematics...
[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>
99e5fe42 27#include <TLorentzVector.h>
28#include <TSystem.h>
29#include <TDatabasePDG.h>
30#include <TRandom.h>
31// From AliRoot ...
85575952 32#include "AliAODJet.h"
d625f15e 33#include "AliPDG.h"
99e5fe42 34#include "AliJetKineReaderHeader.h"
35#include "AliJetKineReader.h"
85575952 36#include "AliMCEventHandler.h"
7f7091b8 37#include "AliMCEvent.h"
99e5fe42 38#include "AliStack.h"
0ffa8579 39#include "AliHeader.h"
40#include "AliGenPythiaEventHeader.h"
85575952 41#include "AliLog.h"
99e5fe42 42
43ClassImp(AliJetKineReader)
44
1b7d5d7e 45AliJetKineReader::AliJetKineReader():
b45b0c92 46 AliJetReader(),
85575952 47 fAliHeader(0),
b0394c65 48 fMCEvent(0),
85575952 49 fGenJets(0)
99e5fe42 50{
1b7d5d7e 51 // Default constructor
99e5fe42 52}
53
54//____________________________________________________________________________
55
56AliJetKineReader::~AliJetKineReader()
57{
58 // Destructor
dee50a65 59 if (fAliHeader) {
60 delete fAliHeader;
61 fAliHeader = 0;
62 }
99e5fe42 63}
64
65//____________________________________________________________________________
66
67void AliJetKineReader::OpenInputFiles()
68{
83a444b1 69 // Opens the input file using the run loader
85575952 70 // Not used anymore
99e5fe42 71}
72
73//____________________________________________________________________________
74
ae24a5a1 75Bool_t AliJetKineReader::FillMomentumArray()
99e5fe42 76{
83a444b1 77 // Fill momentum array for event
85575952 78 Int_t goodTrack = 0;
79 // Clear array
80 // temporary storage of signal and cut flags
81 Int_t* sflag = new Int_t[50000];
82 Int_t* cflag = new Int_t[50000];
83a444b1 83
85575952 84 ClearArray();
85 // Get the stack
b0394c65 86 AliStack* stack = fMCEvent->Stack();
85575952 87 // Number of primaries
88 Int_t nt = stack->GetNprimary();
4faf4c3d 89
85575952 90 // Get cuts set by user and header
91 Double_t ptMin = ((AliJetKineReaderHeader*) fReaderHeader)->GetPtCut();
92 Float_t etaMin = fReaderHeader->GetFiducialEtaMin();
93 Float_t etaMax = fReaderHeader->GetFiducialEtaMax();
b0394c65 94 fAliHeader = fMCEvent->Header();
4faf4c3d 95
85575952 96
97 TLorentzVector p4;
98 // Loop over particles
99 for (Int_t it = 0; it < nt; it++) {
100 TParticle *part = stack->Particle(it);
101 Int_t status = part->GetStatusCode();
102 Int_t pdg = TMath::Abs(part->GetPdgCode());
103 Float_t pt = part->Pt();
4faf4c3d 104
85575952 105 // Skip non-final state particles, neutrinos
106 // and particles with pt < pt_min
107 if ((status != 1)
108 || (pdg == 12 || pdg == 14 || pdg == 16)) continue;
109
110 Float_t p = part->P();
111 Float_t p0 = p;
112 Float_t eta = part->Eta();
113 Float_t phi = part->Phi();
114
115 // Fast simulation of TPC if requested
116 if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimTPC()) {
117 // Charged particles only
118 Float_t charge =
119 TDatabasePDG::Instance()->GetParticle(pdg)->Charge();
120 if (charge == 0) continue;
121 // Simulate efficiency
122 if (!Efficiency(p0, eta, phi)) continue;
123 // Simulate resolution
124 p = SmearMomentum(4, p0);
125 } // End fast TPC
4faf4c3d 126
127 // Fast simulation of EMCAL if requested
85575952 128 if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimEMCAL()) {
129 Float_t charge =
130 TDatabasePDG::Instance()->GetParticle(pdg)->Charge();
131 // Charged particles only
132 if (charge != 0){
133 // Simulate efficiency
134 if (!Efficiency(p0, eta, phi)) continue;
135 // Simulate resolution
136 p = SmearMomentum(4, p0);
137 } // end "if" charged particles
4faf4c3d 138 // Neutral particles (exclude K0L, n, nbar)
85575952 139 if (pdg == kNeutron || pdg == kK0Long) continue;
140 } // End fast EMCAL
141
4faf4c3d 142 // Fill momentum array
85575952 143 Float_t r = p/p0;
144 Float_t px = r * part->Px();
145 Float_t py = r * part->Py();
146 Float_t pz = r * part->Pz();
d625f15e 147 TParticlePDG *pPDG = part->GetPDG();
148 Float_t m = 0;
149 if(!pPDG){
150 // this is very rare...
151 // Is avoided by AliPDG::AddParticlesToPdgDataBase();
152 // but this should be called only once... (how in proof?)
153 // Calucluate mass with unsmeared momentum values
154 m = part->Energy()*part->Energy() -
155 (px * px + py * py + pz * pz)/r/r;
156 if(m>0)m = TMath::Sqrt(m);
157 else m = 0;
158 AliInfo(Form("Unknown Particle using %d calculated mass m = %3.3f",part->GetPdgCode(),m));
159
160 }
161 else{
162 m = pPDG->Mass();
163 }
85575952 164 Float_t e = TMath::Sqrt(px * px + py * py + pz * pz + m * m);
165 p4 = TLorentzVector(px, py, pz, e);
166 if ( (p4.Eta()>etaMax) || (p4.Eta()<etaMin)) continue;
167 new ((*fMomentumArray)[goodTrack]) TLorentzVector(p4);
168
169 // all tracks are signal ... ?
170 sflag[goodTrack]=1;
171 cflag[goodTrack]=0;
172 if (pt > ptMin) cflag[goodTrack] = 1; // track surviving pt cut
173 goodTrack++;
174 } // track loop
175
176// set the signal flags
177 fSignalFlag.Set(goodTrack, sflag);
178 fCutFlag.Set(goodTrack, cflag);
b0394c65 179 AliInfo(Form(" Number of good tracks %d \n", goodTrack));
85575952 180
181 delete[] sflag;
182 delete[] cflag;
183
184 return kTRUE;
99e5fe42 185}
186
187
48bb52d8 188Float_t AliJetKineReader::SmearMomentum(Int_t ind, Float_t p)
189{
83a444b1 190 // The relative momentum error, i.e.
191 // (delta p)/p = sqrt (a**2 + (b*p)**2) * 10**-2,
192 // where typically a = 0.75 and b = 0.16 - 0.24 depending on multiplicity
193 // (the lower value is for dn/d(eta) about 2000, and the higher one for 8000)
194 //
195 // If we include information from TRD, b will be a factor 2/3 smaller.
196 //
197 // ind = 1: high multiplicity
198 // ind = 2: low multiplicity
199 // ind = 3: high multiplicity + TRD
200 // ind = 4: low multiplicity + TRD
201
202 Float_t pSmeared;
203 Float_t a = 0.75;
204 Float_t b = 0.12;
205
206 if (ind == 1) b = 0.12;
207 if (ind == 2) b = 0.08;
208 if (ind == 3) b = 0.12;
209 if (ind == 4) b = 0.08;
210
211 Float_t sigma = p * TMath::Sqrt(a * a + b * b * p * p)*0.01;
212 pSmeared = p + gRandom->Gaus(0., sigma);
213 return pSmeared;
48bb52d8 214}
83a444b1 215
216
48bb52d8 217Bool_t AliJetKineReader::Efficiency(Float_t p, Float_t /*eta*/, Float_t phi)
218{
83a444b1 219 // Fast simulation of geometrical acceptance and tracking efficiency
220
221 // Tracking
222 Float_t eff = 0.99;
223 if (p < 0.5) eff -= (0.5-p)*0.2/0.3;
224 // Geometry
225 if (p > 0.5) {
226 phi *= 180. / TMath::Pi();
227 // Sector number 0 - 17
228 Int_t isec = Int_t(phi / 20.);
229 // Sector centre
230 Float_t phi0 = isec * 20. + 10.;
231 Float_t phir = TMath::Abs(phi-phi0);
232 // 2 deg of dead space
233 if (phir > 9.) eff = 0.;
234 }
235
236 if (gRandom->Rndm() > eff) {
237 return kFALSE;
238 } else {
239 return kTRUE;
240 }
241
48bb52d8 242}
243
85575952 244TClonesArray* AliJetKineReader::GetGeneratedJets()
0ffa8579 245{
85575952 246 //
0ffa8579 247 // Get generated jets from mc header
85575952 248 //
249 if (!fGenJets) {
250 fGenJets = new TClonesArray("AliAODJets", 100);
251 } else {
252 fGenJets->Clear();
253 }
254
255
0ffa8579 256 AliHeader* alih = GetAliHeader();
85575952 257 if (alih == 0) return 0;
0ffa8579 258 AliGenEventHeader * genh = alih->GenEventHeader();
85575952 259 if (genh == 0) return 0;
260
0ffa8579 261 Int_t nj =((AliGenPythiaEventHeader*)genh)->NTriggerJets();
85575952 262 for (Int_t i = 0; i < nj; i++) {
0ffa8579 263 Float_t p[4];
264 ((AliGenPythiaEventHeader*)genh)->TriggerJet(i,p);
85575952 265 new ((*fGenJets)[i]) AliAODJet(p[0], p[1], p[2], p[3]);
0ffa8579 266 }
85575952 267
268 return fGenJets;
269}
270
c4688b3a 271void AliJetKineReader::SetInputEvent(const TObject* /*esd*/, const TObject* /*aod*/, const TObject* mc)
85575952 272{
273 // Connect the input event
b0394c65 274 fMCEvent = (AliMCEvent*) mc;
0ffa8579 275}