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