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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 | |
43 | ClassImp(AliJetKineReader) | |
44 | ||
1b7d5d7e | 45 | AliJetKineReader::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 | ||
56 | AliJetKineReader::~AliJetKineReader() | |
57 | { | |
58 | // Destructor | |
dee50a65 | 59 | if (fAliHeader) { |
60 | delete fAliHeader; | |
61 | fAliHeader = 0; | |
62 | } | |
99e5fe42 | 63 | } |
64 | ||
65 | //____________________________________________________________________________ | |
66 | ||
67 | void AliJetKineReader::OpenInputFiles() | |
68 | { | |
83a444b1 | 69 | // Opens the input file using the run loader |
85575952 | 70 | // Not used anymore |
99e5fe42 | 71 | } |
72 | ||
73 | //____________________________________________________________________________ | |
74 | ||
ae24a5a1 | 75 | Bool_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 | 188 | Float_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 | 217 | Bool_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 | 244 | TClonesArray* 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 | ||
271 | void AliJetKineReader::SetInputEvent(TObject* /*esd*/, TObject* /*aod*/, TObject* mc) | |
272 | { | |
273 | // Connect the input event | |
b0394c65 | 274 | fMCEvent = (AliMCEvent*) mc; |
0ffa8579 | 275 | } |