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dfcc2025 | 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 | ||
16 | ||
17 | //////////////////////////////////////////////////////////////////////// | |
18 | // // | |
19 | // Class for the Selection of Non-Heavy-Flavour-Electrons trought // | |
20 | // the invariant mass method. The selection can be done from two // | |
21 | // diferent algorithms, which can be choosed calling the function // | |
22 | // "SetAlgorithm(TString Algorithm)". // | |
23 | // // | |
24 | // Author: Elienos Pereira de Oliveira Filho // | |
25 | // (University of São Paulo) // | |
26 | // // | |
27 | //////////////////////////////////////////////////////////////////////// | |
28 | ||
29 | #include "TH1F.h" | |
30 | #include "TMath.h" | |
31 | #include "TLorentzVector.h" | |
7edfba87 | 32 | #include "AliAODTrack.h" |
dfcc2025 | 33 | #include "AliESDtrack.h" |
7edfba87 | 34 | #include "AliVEvent.h" |
35 | #include "AliESDtrackCuts.h" | |
36 | #include "AliVTrack.h" | |
37 | #include "AliVParticle.h" | |
70448e3b | 38 | #include "AliPIDResponse.h" |
39 | #include "AliPID.h" | |
7edfba87 | 40 | #include "AliExternalTrackParam.h" |
dfcc2025 | 41 | #include "AliSelectNonHFE.h" |
42 | #include "AliKFParticle.h" | |
43 | #include "AliLog.h" | |
44 | #include "stdio.h" | |
45 | #include "iostream" | |
46 | #include "fstream" | |
47 | ||
48 | ClassImp(AliSelectNonHFE) | |
49 | //________________________________________________________________________ | |
50 | AliSelectNonHFE::AliSelectNonHFE(const char *name, const Char_t *title) | |
51 | : TNamed(name, title) | |
52 | ,fTrackCuts(0) | |
7edfba87 | 53 | ,fAlgorithm("DCA") |
dfcc2025 | 54 | ,fAngleCut(999) |
55 | ,fdcaCut(999) | |
70448e3b | 56 | ,fTPCnSigmaMin(-3) |
57 | ,fTPCnSigmaMax(3) | |
dfcc2025 | 58 | ,fMassCut(0.5) |
59 | ,fChi2OverNDFCut(999) | |
a6f21076 | 60 | ,fPtMin(0.3) |
dfcc2025 | 61 | ,fIsLS(kFALSE) |
62 | ,fIsULS(kFALSE) | |
7edfba87 | 63 | ,fIsAOD(kFALSE) |
a6f21076 | 64 | ,fHasPtCut(kFALSE) |
dfcc2025 | 65 | ,fNLS(0) |
66 | ,fNULS(0) | |
a6f21076 | 67 | ,fTpcNcls(50) |
dfcc2025 | 68 | ,fLSPartner(0) |
69 | ,fULSPartner(0) | |
70 | ,fHistMass(0) | |
71 | ,fHistMassBack(0) | |
72 | ,fHistDCA(0) | |
73 | ,fHistDCABack(0) | |
74 | ,fHistAngle(0) | |
75 | ,fHistAngleBack(0) | |
70448e3b | 76 | ,fPIDResponse(0) |
dfcc2025 | 77 | { |
78 | // | |
79 | // Constructor | |
80 | // | |
81 | ||
82 | fTrackCuts = new AliESDtrackCuts(); | |
83 | //Configure Default Track Cuts | |
84 | fTrackCuts->SetAcceptKinkDaughters(kFALSE); | |
85 | fTrackCuts->SetRequireTPCRefit(kTRUE); | |
86 | fTrackCuts->SetEtaRange(-0.9,0.9); | |
87 | fTrackCuts->SetRequireSigmaToVertex(kTRUE); | |
88 | fTrackCuts->SetMaxChi2PerClusterTPC(4.0); | |
89 | fTrackCuts->SetMinNClustersTPC(50); | |
90 | fTrackCuts->SetPtRange(0.3,1e10); | |
91 | ||
92 | ||
93 | } | |
94 | ||
95 | //________________________________________________________________________ | |
96 | AliSelectNonHFE::AliSelectNonHFE() | |
97 | : TNamed() | |
98 | ,fTrackCuts(0) | |
7edfba87 | 99 | ,fAlgorithm("DCA") |
dfcc2025 | 100 | ,fAngleCut(999) |
101 | ,fdcaCut(999) | |
70448e3b | 102 | ,fTPCnSigmaMin(-3) |
103 | ,fTPCnSigmaMax(3) | |
dfcc2025 | 104 | ,fMassCut(0.5) |
105 | ,fChi2OverNDFCut(999) | |
a6f21076 | 106 | ,fPtMin(0.3) |
dfcc2025 | 107 | ,fIsLS(kFALSE) |
108 | ,fIsULS(kFALSE) | |
7edfba87 | 109 | ,fIsAOD(kFALSE) |
a6f21076 | 110 | ,fHasPtCut(kFALSE) |
dfcc2025 | 111 | ,fNLS(0) |
112 | ,fNULS(0) | |
a6f21076 | 113 | ,fTpcNcls(50) |
dfcc2025 | 114 | ,fLSPartner(0) |
115 | ,fULSPartner(0) | |
116 | ,fHistMass(0) | |
117 | ,fHistMassBack(0) | |
118 | ,fHistDCA(0) | |
119 | ,fHistDCABack(0) | |
120 | ,fHistAngle(0) | |
121 | ,fHistAngleBack(0) | |
70448e3b | 122 | ,fPIDResponse(0) |
dfcc2025 | 123 | { |
124 | // | |
125 | // Constructor | |
126 | // | |
127 | ||
128 | fTrackCuts = new AliESDtrackCuts(); | |
129 | //Configure Default Track Cuts | |
130 | fTrackCuts->SetAcceptKinkDaughters(kFALSE); | |
131 | fTrackCuts->SetRequireTPCRefit(kTRUE); | |
132 | fTrackCuts->SetEtaRange(-0.9,0.9); | |
133 | fTrackCuts->SetRequireSigmaToVertex(kTRUE); | |
134 | fTrackCuts->SetMaxChi2PerClusterTPC(4.0); | |
135 | fTrackCuts->SetMinNClustersTPC(50); | |
136 | fTrackCuts->SetPtRange(0.3,1e10); | |
137 | ||
138 | ||
139 | } | |
140 | ||
141 | //_________________________________________ | |
142 | AliSelectNonHFE::~AliSelectNonHFE() | |
143 | { | |
144 | // | |
145 | // Destructor | |
146 | // | |
147 | ||
148 | if(fTrackCuts) delete fTrackCuts; | |
149 | if(fLSPartner) delete [] fLSPartner; | |
150 | if(fULSPartner) delete [] fULSPartner; | |
151 | ||
152 | ||
153 | } | |
154 | ||
155 | //__________________________________________ | |
7edfba87 | 156 | void AliSelectNonHFE::FindNonHFE(Int_t iTrack1, AliVParticle *Vtrack1, AliVEvent *fVevent) |
dfcc2025 | 157 | { |
7edfba87 | 158 | AliVTrack *track1 = dynamic_cast<AliVTrack*>(Vtrack1); |
159 | AliESDtrack *etrack1 = dynamic_cast<AliESDtrack*>(Vtrack1); | |
2d17adb0 | 160 | AliExternalTrackParam *extTrackParam1=NULL; |
161 | AliExternalTrackParam *extTrackParam2=NULL; | |
7edfba87 | 162 | if(fAlgorithm=="DCA") |
163 | { | |
164 | extTrackParam1 = new AliExternalTrackParam(); | |
165 | extTrackParam1->CopyFromVTrack(track1); | |
166 | } | |
dfcc2025 | 167 | // |
168 | // Find non HFE electrons | |
169 | // | |
170 | ||
dfcc2025 | 171 | //Magnetic Field |
7edfba87 | 172 | Double_t bfield = fVevent->GetMagneticField(); |
dfcc2025 | 173 | |
174 | //Second Track loop | |
175 | ||
176 | fIsULS = kFALSE; //Non-HFE Unlike signal Flag | |
177 | fIsLS = kFALSE; //Non-HFE like signal Flag | |
178 | fNULS = 0; //Non-HFE Unlike signal Flag | |
179 | fNLS = 0; //Non-HFE like signal Flag | |
180 | ||
181 | if(fLSPartner) delete [] fLSPartner; | |
182 | if(fULSPartner) delete [] fULSPartner; | |
183 | fLSPartner = new int [100]; //store the partners index | |
184 | fULSPartner = new int [100]; //store the partners index | |
185 | ||
7edfba87 | 186 | for(Int_t iTrack2 = 0; iTrack2 < fVevent->GetNumberOfTracks(); iTrack2++) |
dfcc2025 | 187 | { |
7edfba87 | 188 | if(iTrack1==iTrack2) continue; |
7c4ec6e7 | 189 | |
7edfba87 | 190 | AliVParticle* Vtrack2 = fVevent->GetTrack(iTrack2); |
191 | if (!Vtrack2) | |
dfcc2025 | 192 | { |
193 | printf("ERROR: Could not receive track %d\n", iTrack2); | |
194 | continue; | |
195 | } | |
7edfba87 | 196 | |
197 | AliVTrack *track2 = dynamic_cast<AliVTrack*>(Vtrack2); | |
198 | AliAODTrack *atrack2 = dynamic_cast<AliAODTrack*>(Vtrack2); | |
199 | AliESDtrack *etrack2 = dynamic_cast<AliESDtrack*>(Vtrack2); | |
200 | ||
201 | if(fAlgorithm=="DCA") | |
202 | { | |
203 | extTrackParam2 = new AliExternalTrackParam(); | |
204 | extTrackParam2->CopyFromVTrack(track2); | |
205 | } | |
206 | ||
dfcc2025 | 207 | //Second track cuts |
7edfba87 | 208 | if(fIsAOD) |
209 | { | |
210 | if(!atrack2->TestFilterMask(AliAODTrack::kTrkTPCOnly)) continue; | |
211 | if((!(atrack2->GetStatus()&AliESDtrack::kITSrefit)|| (!(atrack2->GetStatus()&AliESDtrack::kTPCrefit)))) continue; | |
a6f21076 | 212 | if(atrack2->GetTPCNcls() < fTpcNcls) continue; |
7edfba87 | 213 | } |
214 | else | |
215 | { | |
216 | if(!fTrackCuts->AcceptTrack(etrack2)) continue; | |
217 | } | |
218 | ||
219 | //Second track pid | |
70448e3b | 220 | Double_t tpcNsigma2 = fPIDResponse->NumberOfSigmasTPC(track2,AliPID::kElectron); |
70448e3b | 221 | if(tpcNsigma2<fTPCnSigmaMin || tpcNsigma2>fTPCnSigmaMax) continue; |
dfcc2025 | 222 | |
a6f21076 | 223 | //Pt Cut |
224 | if((track2->Pt() < fPtMin) && (fHasPtCut)) continue; | |
7edfba87 | 225 | |
226 | if(fAlgorithm=="DCA") | |
dfcc2025 | 227 | { |
228 | //Variables | |
229 | Double_t p1[3]; | |
230 | Double_t p2[3]; | |
231 | Double_t xt1; //radial position track 1 at the DCA point | |
232 | Double_t xt2; //radial position track 2 at the DCA point | |
7edfba87 | 233 | Double_t dca12; //DCA 1-2 |
234 | Bool_t hasdcaT1; | |
235 | Bool_t hasdcaT2; | |
dfcc2025 | 236 | |
7edfba87 | 237 | if(fIsAOD) |
238 | { | |
239 | //DCA track1-track2 | |
240 | dca12 = extTrackParam2->GetDCA(extTrackParam1,bfield,xt2,xt1); | |
241 | ||
242 | //Momento of the track extrapolated to DCA track-track | |
243 | //Track1 | |
244 | hasdcaT1 = extTrackParam1->GetPxPyPzAt(xt1,bfield,p1); | |
245 | //Track2 | |
246 | hasdcaT2 = extTrackParam2->GetPxPyPzAt(xt2,bfield,p2); | |
247 | } | |
248 | else | |
249 | { | |
250 | //DCA track1-track2 | |
251 | dca12 = etrack2->GetDCA(etrack1,bfield,xt2,xt1); | |
252 | ||
253 | //Momento of the track extrapolated to DCA track-track | |
254 | //Track1 | |
255 | hasdcaT1 = etrack1->GetPxPyPzAt(xt1,bfield,p1); | |
256 | //Track2 | |
257 | hasdcaT2 = etrack2->GetPxPyPzAt(xt2,bfield,p2); | |
258 | } | |
dfcc2025 | 259 | |
260 | if(!hasdcaT1 || !hasdcaT2) AliWarning("It could be a problem in the extrapolation"); | |
261 | ||
262 | //track1-track2 Invariant Mass | |
263 | Double_t eMass = 0.000510998910; //Electron mass in GeV | |
264 | Double_t pP1 = sqrt(p1[0]*p1[0]+p1[1]*p1[1]+p1[2]*p1[2]); //Track 1 momentum | |
265 | Double_t pP2 = sqrt(p2[0]*p2[0]+p2[1]*p2[1]+p2[2]*p2[2]); //Track 1 momentum | |
266 | ||
267 | //Double_t E1 = sqrt(eMass*eMass+pP1*pP1); | |
268 | //Double_t E2 = sqrt(eMass*eMass+pP2*pP2); | |
269 | //Double_t imass = sqrt(2*eMass*eMass+2*(E1*E2-(p1[0]*p2[0]+p1[1]*p2[1]+p1[2]*p2[2]))); | |
270 | //Double_t angle = TMath::ACos((p1[0]*p2[0]+p1[1]*p2[1]+p1[2]*p2[2])/(pP1*pP2)); | |
271 | ||
272 | TLorentzVector v1(p1[0],p1[1],p1[2],sqrt(eMass*eMass+pP1*pP1)); | |
273 | TLorentzVector v2(p2[0],p2[1],p2[2],sqrt(eMass*eMass+pP2*pP2)); | |
274 | Double_t imass = (v1+v2).M(); //Invariant Mass | |
275 | Double_t angle = v1.Angle(v2.Vect()); //Opening Angle (Total Angle) | |
276 | ||
277 | Float_t fCharge1 = track1->Charge(); | |
278 | Float_t fCharge2 = track2->Charge(); | |
279 | ||
280 | if(imass<fMassCut && angle<fAngleCut && dca12<fdcaCut) | |
281 | { | |
282 | if(fCharge1*fCharge2<0) | |
283 | { | |
284 | fIsULS=kTRUE; | |
285 | fULSPartner[fNULS] = iTrack2; | |
286 | fNULS++; | |
287 | } | |
288 | if(fCharge1*fCharge2>0) | |
289 | { | |
290 | fIsLS=kTRUE; | |
291 | fLSPartner[fNLS] = iTrack2; | |
292 | fNLS++; | |
293 | } | |
294 | } | |
295 | ||
296 | //Fill some histograms | |
297 | if(fCharge1*fCharge2<0 && fHistMass) fHistMass->Fill(imass); | |
298 | if(fCharge1*fCharge2>0 && fHistMassBack) fHistMassBack->Fill(imass); | |
299 | ||
300 | if(fCharge1*fCharge2<0 && fHistDCA) fHistDCA->Fill(dca12); | |
301 | if(fCharge1*fCharge2>0 && fHistDCABack) fHistDCABack->Fill(dca12); | |
302 | ||
303 | if(fCharge1*fCharge2<0 && fHistAngle) fHistAngle->Fill(angle); | |
304 | if(fCharge1*fCharge2>0 && fHistAngleBack) fHistAngleBack->Fill(angle); | |
305 | ||
306 | } | |
307 | else if(fAlgorithm=="KF") | |
308 | { | |
309 | Int_t fPDGtrack1 = 11; | |
310 | Int_t fPDGtrack2 = 11; | |
311 | ||
312 | Float_t fCharge1 = track1->Charge(); | |
313 | Float_t fCharge2 = track2->Charge(); | |
314 | ||
315 | if(fCharge1>0) fPDGtrack1 = -11; | |
316 | if(fCharge2>0) fPDGtrack2 = -11; | |
317 | ||
a6f21076 | 318 | AliKFParticle::SetField(bfield); |
dfcc2025 | 319 | AliKFParticle fKFtrack1(*track1, fPDGtrack1); |
320 | AliKFParticle fKFtrack2(*track2, fPDGtrack2); | |
321 | AliKFParticle fRecoGamma(fKFtrack1, fKFtrack2); | |
322 | ||
323 | //Reconstruction Cuts | |
324 | if(fRecoGamma.GetNDF()<1) continue; | |
325 | Double_t chi2OverNDF = fRecoGamma.GetChi2()/fRecoGamma.GetNDF(); | |
326 | if(TMath::Sqrt(TMath::Abs(chi2OverNDF))>fChi2OverNDFCut) continue; | |
327 | ||
328 | //Invariant Mass | |
329 | Double_t imass; | |
330 | Double_t width; | |
331 | fRecoGamma.GetMass(imass,width); | |
332 | ||
333 | //Opening Angle (Total Angle) | |
334 | Double_t angle = fKFtrack1.GetAngle(fKFtrack2); | |
335 | ||
336 | //Fill some histograms | |
337 | if(fCharge1*fCharge2<0 && fHistAngle) fHistAngle->Fill(angle); | |
338 | if(fCharge1*fCharge2>0 && fHistAngleBack) fHistAngleBack->Fill(angle); | |
339 | ||
7c4ec6e7 | 340 | if(angle>fAngleCut) continue; |
dfcc2025 | 341 | |
342 | if(imass<fMassCut) | |
343 | { | |
344 | if(fCharge1*fCharge2<0) | |
345 | { | |
346 | fIsULS=kTRUE; | |
347 | fULSPartner[fNULS] = iTrack2; | |
348 | fNULS++; | |
349 | } | |
350 | if(fCharge1*fCharge2>0) | |
351 | { | |
352 | fIsLS=kTRUE; | |
353 | fLSPartner[fNLS] = iTrack2; | |
354 | fNLS++; | |
355 | } | |
356 | } | |
357 | ||
358 | //Fill some histograms | |
359 | if(fCharge1*fCharge2<0 && fHistMass) fHistMass->Fill(imass); | |
360 | if(fCharge1*fCharge2>0 && fHistMassBack) fHistMassBack->Fill(imass); | |
361 | ||
362 | } | |
363 | else | |
364 | { | |
365 | AliError( Form("Error: %s is not a valid algorithm option.",(const char*)fAlgorithm)); | |
366 | return; | |
367 | } | |
2d17adb0 | 368 | if(extTrackParam2) delete extTrackParam2; |
369 | ||
dfcc2025 | 370 | } |
7edfba87 | 371 | |
372 | ||
2d17adb0 | 373 | if(extTrackParam1) delete extTrackParam1; |
374 | ||
dfcc2025 | 375 | |
376 | return; | |
377 | } |