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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 | |
41 | ClassImp(AliJetKineReader) | |
42 | ||
1b7d5d7e | 43 | AliJetKineReader::AliJetKineReader(): |
44 | fRunLoader(0x0), | |
0ffa8579 | 45 | fAliHeader(0x0), |
1b7d5d7e | 46 | fMass(0), |
47 | fPdgC(0) | |
99e5fe42 | 48 | { |
1b7d5d7e | 49 | // Default constructor |
99e5fe42 | 50 | fReaderHeader = 0x0; |
99e5fe42 | 51 | } |
52 | ||
53 | //____________________________________________________________________________ | |
54 | ||
55 | AliJetKineReader::~AliJetKineReader() | |
56 | { | |
57 | // Destructor | |
58 | delete fReaderHeader; | |
0ffa8579 | 59 | delete fAliHeader; |
99e5fe42 | 60 | } |
61 | ||
62 | //____________________________________________________________________________ | |
63 | ||
64 | void AliJetKineReader::OpenInputFiles() | |
65 | { | |
83a444b1 | 66 | // Opens the input file using the run loader |
67 | const char* dirName = fReaderHeader->GetDirectory(); | |
68 | char path[256]; | |
69 | sprintf(path, "%s/galice.root",dirName); | |
70 | fRunLoader = AliRunLoader::Open(path); | |
71 | fRunLoader->LoadKinematics(); | |
72 | fRunLoader->LoadHeader(); | |
73 | ||
74 | // get number of events | |
75 | Int_t nMax = fRunLoader->GetNumberOfEvents(); | |
76 | printf("\nTotal number of events = %d", nMax); | |
77 | ||
99e5fe42 | 78 | // set number of events in header |
83a444b1 | 79 | if (fReaderHeader->GetLastEvent() == -1) |
80 | fReaderHeader->SetLastEvent(nMax); | |
81 | else { | |
82 | Int_t nUsr = fReaderHeader->GetLastEvent(); | |
83 | fReaderHeader->SetLastEvent(TMath::Min(nMax, nUsr)); | |
84 | } | |
99e5fe42 | 85 | } |
86 | ||
87 | //____________________________________________________________________________ | |
88 | ||
0ffa8579 | 89 | Bool_t AliJetKineReader::FillMomentumArray(Int_t event) |
99e5fe42 | 90 | { |
83a444b1 | 91 | // Fill momentum array for event |
92 | ||
93 | Int_t goodTrack = 0; | |
94 | // Clear array | |
95 | ClearArray(); | |
96 | // Get event from runloader | |
97 | fRunLoader->GetEvent(event); | |
98 | // Get the stack | |
99 | AliStack* stack = fRunLoader->Stack(); | |
100 | // Number of primaries | |
101 | Int_t nt = stack->GetNprimary(); | |
102 | ||
103 | // Get cuts set by user and header | |
104 | Double_t ptMin = ((AliJetKineReaderHeader*) fReaderHeader)->GetPtCut(); | |
105 | Float_t etaMin = fReaderHeader->GetFiducialEtaMin(); | |
106 | Float_t etaMax = fReaderHeader->GetFiducialEtaMax(); | |
107 | fAliHeader = fRunLoader->GetHeader(); | |
108 | ||
109 | // temporary storage of signal and cut flags | |
110 | Int_t* sflag = new Int_t[nt]; | |
111 | Int_t* cflag = new Int_t[nt]; | |
112 | ||
113 | TLorentzVector p4; | |
114 | // Loop over particles | |
115 | for (Int_t it = 0; it < nt; it++) { | |
116 | TParticle *part = stack->Particle(it); | |
117 | Int_t status = part->GetStatusCode(); | |
118 | Int_t pdg = TMath::Abs(part->GetPdgCode()); | |
119 | Float_t pt = part->Pt(); | |
120 | ||
121 | // Skip non-final state particles, neutrinos | |
122 | // and particles with pt < pt_min | |
123 | if ((status != 1) | |
124 | || (pdg == 12 || pdg == 14 || pdg == 16)) continue; | |
125 | ||
126 | Float_t p = part->P(); | |
127 | Float_t p0 = p; | |
128 | Float_t eta = part->Eta(); | |
129 | Float_t phi = part->Phi(); | |
130 | ||
131 | // Fast simulation of TPC if requested | |
132 | if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimTPC()) { | |
133 | // Charged particles only | |
134 | Float_t charge = | |
135 | TDatabasePDG::Instance()->GetParticle(pdg)->Charge(); | |
136 | if (charge == 0) continue; | |
137 | // Simulate efficiency | |
138 | if (!Efficiency(p0, eta, phi)) continue; | |
139 | // Simulate resolution | |
140 | p = SmearMomentum(4, p0); | |
141 | } // End fast TPC | |
142 | ||
143 | // Fast simulation of EMCAL if requested | |
144 | if (((AliJetKineReaderHeader*)fReaderHeader)->FastSimEMCAL()) { | |
145 | Float_t charge = | |
146 | TDatabasePDG::Instance()->GetParticle(pdg)->Charge(); | |
147 | // Charged particles only | |
148 | if (charge != 0){ | |
149 | // Simulate efficiency | |
150 | if (!Efficiency(p0, eta, phi)) continue; | |
151 | // Simulate resolution | |
152 | p = SmearMomentum(4, p0); | |
153 | } // end "if" charged particles | |
154 | // Neutral particles (exclude K0L, n, nbar) | |
155 | if (pdg == kNeutron || pdg == kK0Long) continue; | |
156 | } // End fast EMCAL | |
157 | ||
158 | fMass = part->GetCalcMass(); | |
159 | fPdgC = part->GetPdgCode(); | |
160 | ||
161 | // Fill momentum array | |
162 | Float_t r = p/p0; | |
163 | Float_t px = r * part->Px(); | |
164 | Float_t py = r * part->Py(); | |
165 | Float_t pz = r * part->Pz(); | |
166 | Float_t m = part->GetMass(); | |
167 | Float_t e = TMath::Sqrt(px * px + py * py + pz * pz + m * m); | |
168 | p4 = TLorentzVector(px, py, pz, e); | |
169 | if ( (p4.Eta()>etaMax) || (p4.Eta()<etaMin)) continue; | |
170 | new ((*fMomentumArray)[goodTrack]) TLorentzVector(p4); | |
171 | ||
172 | // all tracks are signal ... ? | |
173 | sflag[goodTrack]=1; | |
174 | cflag[goodTrack]=0; | |
175 | if (pt > ptMin) cflag[goodTrack]=1; // track surviving pt cut | |
176 | goodTrack++; | |
99e5fe42 | 177 | } |
83a444b1 | 178 | |
179 | // set the signal flags | |
180 | fSignalFlag.Set(goodTrack,sflag); | |
181 | fCutFlag.Set(goodTrack,cflag); | |
182 | printf("\nIn event %d, number of good tracks %d \n", event, goodTrack); | |
0ffa8579 | 183 | return kTRUE; |
99e5fe42 | 184 | } |
185 | ||
186 | ||
48bb52d8 | 187 | Float_t AliJetKineReader::SmearMomentum(Int_t ind, Float_t p) |
188 | { | |
83a444b1 | 189 | // The relative momentum error, i.e. |
190 | // (delta p)/p = sqrt (a**2 + (b*p)**2) * 10**-2, | |
191 | // where typically a = 0.75 and b = 0.16 - 0.24 depending on multiplicity | |
192 | // (the lower value is for dn/d(eta) about 2000, and the higher one for 8000) | |
193 | // | |
194 | // If we include information from TRD, b will be a factor 2/3 smaller. | |
195 | // | |
196 | // ind = 1: high multiplicity | |
197 | // ind = 2: low multiplicity | |
198 | // ind = 3: high multiplicity + TRD | |
199 | // ind = 4: low multiplicity + TRD | |
200 | ||
201 | Float_t pSmeared; | |
202 | Float_t a = 0.75; | |
203 | Float_t b = 0.12; | |
204 | ||
205 | if (ind == 1) b = 0.12; | |
206 | if (ind == 2) b = 0.08; | |
207 | if (ind == 3) b = 0.12; | |
208 | if (ind == 4) b = 0.08; | |
209 | ||
210 | Float_t sigma = p * TMath::Sqrt(a * a + b * b * p * p)*0.01; | |
211 | pSmeared = p + gRandom->Gaus(0., sigma); | |
212 | return pSmeared; | |
48bb52d8 | 213 | } |
83a444b1 | 214 | |
215 | ||
48bb52d8 | 216 | Bool_t AliJetKineReader::Efficiency(Float_t p, Float_t /*eta*/, Float_t phi) |
217 | { | |
83a444b1 | 218 | // Fast simulation of geometrical acceptance and tracking efficiency |
219 | ||
220 | // Tracking | |
221 | Float_t eff = 0.99; | |
222 | if (p < 0.5) eff -= (0.5-p)*0.2/0.3; | |
223 | // Geometry | |
224 | if (p > 0.5) { | |
225 | phi *= 180. / TMath::Pi(); | |
226 | // Sector number 0 - 17 | |
227 | Int_t isec = Int_t(phi / 20.); | |
228 | // Sector centre | |
229 | Float_t phi0 = isec * 20. + 10.; | |
230 | Float_t phir = TMath::Abs(phi-phi0); | |
231 | // 2 deg of dead space | |
232 | if (phir > 9.) eff = 0.; | |
233 | } | |
234 | ||
235 | if (gRandom->Rndm() > eff) { | |
236 | return kFALSE; | |
237 | } else { | |
238 | return kTRUE; | |
239 | } | |
240 | ||
48bb52d8 | 241 | } |
242 | ||
0ffa8579 | 243 | Bool_t AliJetKineReader::GetGenJets(AliJet* genJets) |
244 | { | |
245 | // Get generated jets from mc header | |
246 | AliHeader* alih = GetAliHeader(); | |
247 | if (alih == 0) return kFALSE; | |
248 | AliGenEventHeader * genh = alih->GenEventHeader(); | |
249 | if (genh == 0) return kFALSE; | |
250 | Int_t nj =((AliGenPythiaEventHeader*)genh)->NTriggerJets(); | |
251 | Int_t* m = new Int_t[nj]; | |
252 | Int_t* k = new Int_t[nj]; | |
253 | for (Int_t i=0; i< nj; i++) { | |
254 | Float_t p[4]; | |
255 | ((AliGenPythiaEventHeader*)genh)->TriggerJet(i,p); | |
256 | genJets->AddJet(p[0],p[1],p[2],p[3]); | |
257 | m[i]=1; | |
258 | k[i]=i; | |
259 | } | |
260 | genJets->SetNinput(nj); | |
261 | genJets->SetMultiplicities(m); | |
262 | genJets->SetInJet(k); | |
263 | return kTRUE; | |
264 | } |