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