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Using a conservative 3% estimate for the K0s signal extraction systematics. Using...
[u/mrichter/AliRoot.git] / PWGHF / hfe / AliSelectNonHFE.cxx
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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"
32
33#include "AliESDEvent.h"
34#include "AliESDtrackCuts.h"
35#include "AliESDtrack.h"
36
37#include "AliSelectNonHFE.h"
38#include "AliKFParticle.h"
39#include "AliLog.h"
40#include "stdio.h"
41#include "iostream"
42#include "fstream"
43
44ClassImp(AliSelectNonHFE)
45//________________________________________________________________________
46AliSelectNonHFE::AliSelectNonHFE(const char *name, const Char_t *title)
47: TNamed(name, title)
48 ,fTrackCuts(0)
49 ,fAlgorithm("MA")
50 ,fAngleCut(999)
51 ,fdcaCut(999)
52 ,fdEdxMin(62)
53 ,fdEdxMax(100)
54 ,fMassCut(0.5)
55 ,fChi2OverNDFCut(999)
56 ,fIsLS(kFALSE)
57 ,fIsULS(kFALSE)
58 ,fNLS(0)
59 ,fNULS(0)
60 ,fLSPartner(0)
61 ,fULSPartner(0)
62 ,fHistMass(0)
63 ,fHistMassBack(0)
64 ,fHistDCA(0)
65 ,fHistDCABack(0)
66 ,fHistAngle(0)
67 ,fHistAngleBack(0)
68{
69 //
70 // Constructor
71 //
72
73 fTrackCuts = new AliESDtrackCuts();
74 //Configure Default Track Cuts
75 fTrackCuts->SetAcceptKinkDaughters(kFALSE);
76 fTrackCuts->SetRequireTPCRefit(kTRUE);
77 fTrackCuts->SetEtaRange(-0.9,0.9);
78 fTrackCuts->SetRequireSigmaToVertex(kTRUE);
79 fTrackCuts->SetMaxChi2PerClusterTPC(4.0);
80 fTrackCuts->SetMinNClustersTPC(50);
81 fTrackCuts->SetPtRange(0.3,1e10);
82
83
84}
85
86//________________________________________________________________________
87AliSelectNonHFE::AliSelectNonHFE()
88 : TNamed()
89 ,fTrackCuts(0)
90 ,fAlgorithm("MA")
91 ,fAngleCut(999)
92 ,fdcaCut(999)
93 ,fdEdxMin(62)
94 ,fdEdxMax(100)
95 ,fMassCut(0.5)
96 ,fChi2OverNDFCut(999)
97 ,fIsLS(kFALSE)
98 ,fIsULS(kFALSE)
99 ,fNLS(0)
100 ,fNULS(0)
101 ,fLSPartner(0)
102 ,fULSPartner(0)
103 ,fHistMass(0)
104 ,fHistMassBack(0)
105 ,fHistDCA(0)
106 ,fHistDCABack(0)
107 ,fHistAngle(0)
108 ,fHistAngleBack(0)
109{
110 //
111 // Constructor
112 //
113
114 fTrackCuts = new AliESDtrackCuts();
115 //Configure Default Track Cuts
116 fTrackCuts->SetAcceptKinkDaughters(kFALSE);
117 fTrackCuts->SetRequireTPCRefit(kTRUE);
118 fTrackCuts->SetEtaRange(-0.9,0.9);
119 fTrackCuts->SetRequireSigmaToVertex(kTRUE);
120 fTrackCuts->SetMaxChi2PerClusterTPC(4.0);
121 fTrackCuts->SetMinNClustersTPC(50);
122 fTrackCuts->SetPtRange(0.3,1e10);
123
124
125}
126
127//_________________________________________
128AliSelectNonHFE::~AliSelectNonHFE()
129{
130 //
131 // Destructor
132 //
133
134 if(fTrackCuts) delete fTrackCuts;
135 if(fLSPartner) delete [] fLSPartner;
136 if(fULSPartner) delete [] fULSPartner;
137
138
139}
140
141//__________________________________________
142void AliSelectNonHFE::FindNonHFE(Int_t iTrack1, AliESDtrack *track1, AliESDEvent *fESD)
143{
144 //
145 // Find non HFE electrons
146 //
147
148
149 //Magnetic Field
150 Double_t bfield = fESD->GetMagneticField();
151
152 //Second Track loop
153
154 fIsULS = kFALSE; //Non-HFE Unlike signal Flag
155 fIsLS = kFALSE; //Non-HFE like signal Flag
156 fNULS = 0; //Non-HFE Unlike signal Flag
157 fNLS = 0; //Non-HFE like signal Flag
158
159 if(fLSPartner) delete [] fLSPartner;
160 if(fULSPartner) delete [] fULSPartner;
161 fLSPartner = new int [100]; //store the partners index
162 fULSPartner = new int [100]; //store the partners index
163
7c4ec6e7 164 for(Int_t iTrack2 = 0; iTrack2 < fESD->GetNumberOfTracks(); iTrack2++)
dfcc2025 165 {
7c4ec6e7 166 if(iTrack1==iTrack2) continue;
167
dfcc2025 168 AliESDtrack* track2 = fESD->GetTrack(iTrack2);
169 if (!track2)
170 {
171 printf("ERROR: Could not receive track %d\n", iTrack2);
172 continue;
173 }
174
175 //Second track cuts
176 Double_t dEdx2 = track2->GetTPCsignal();
177 if(dEdx2<fdEdxMin || dEdx2>fdEdxMax) continue;
178 if(!fTrackCuts->AcceptTrack(track2)) continue;
179
180 if(fAlgorithm=="MA")
181 {
182 //Variables
183 Double_t p1[3];
184 Double_t p2[3];
185 Double_t xt1; //radial position track 1 at the DCA point
186 Double_t xt2; //radial position track 2 at the DCA point
187 //DCA track1-track2
188 Double_t dca12 = track2->GetDCA(track1,bfield,xt2,xt1);
189
190 //Momento of the track extrapolated to DCA track-track
191 //Track1
192 Bool_t hasdcaT1 = track1->GetPxPyPzAt(xt1,bfield,p1);
193 //Track2
194 Bool_t hasdcaT2 = track2->GetPxPyPzAt(xt2,bfield,p2);
195
196 if(!hasdcaT1 || !hasdcaT2) AliWarning("It could be a problem in the extrapolation");
197
198 //track1-track2 Invariant Mass
199 Double_t eMass = 0.000510998910; //Electron mass in GeV
200 Double_t pP1 = sqrt(p1[0]*p1[0]+p1[1]*p1[1]+p1[2]*p1[2]); //Track 1 momentum
201 Double_t pP2 = sqrt(p2[0]*p2[0]+p2[1]*p2[1]+p2[2]*p2[2]); //Track 1 momentum
202
203 //Double_t E1 = sqrt(eMass*eMass+pP1*pP1);
204 //Double_t E2 = sqrt(eMass*eMass+pP2*pP2);
205 //Double_t imass = sqrt(2*eMass*eMass+2*(E1*E2-(p1[0]*p2[0]+p1[1]*p2[1]+p1[2]*p2[2])));
206 //Double_t angle = TMath::ACos((p1[0]*p2[0]+p1[1]*p2[1]+p1[2]*p2[2])/(pP1*pP2));
207
208 TLorentzVector v1(p1[0],p1[1],p1[2],sqrt(eMass*eMass+pP1*pP1));
209 TLorentzVector v2(p2[0],p2[1],p2[2],sqrt(eMass*eMass+pP2*pP2));
210 Double_t imass = (v1+v2).M(); //Invariant Mass
211 Double_t angle = v1.Angle(v2.Vect()); //Opening Angle (Total Angle)
212
213 Float_t fCharge1 = track1->Charge();
214 Float_t fCharge2 = track2->Charge();
215
216 if(imass<fMassCut && angle<fAngleCut && dca12<fdcaCut)
217 {
218 if(fCharge1*fCharge2<0)
219 {
220 fIsULS=kTRUE;
221 fULSPartner[fNULS] = iTrack2;
222 fNULS++;
223 }
224 if(fCharge1*fCharge2>0)
225 {
226 fIsLS=kTRUE;
227 fLSPartner[fNLS] = iTrack2;
228 fNLS++;
229 }
230 }
231
232 //Fill some histograms
233 if(fCharge1*fCharge2<0 && fHistMass) fHistMass->Fill(imass);
234 if(fCharge1*fCharge2>0 && fHistMassBack) fHistMassBack->Fill(imass);
235
236 if(fCharge1*fCharge2<0 && fHistDCA) fHistDCA->Fill(dca12);
237 if(fCharge1*fCharge2>0 && fHistDCABack) fHistDCABack->Fill(dca12);
238
239 if(fCharge1*fCharge2<0 && fHistAngle) fHistAngle->Fill(angle);
240 if(fCharge1*fCharge2>0 && fHistAngleBack) fHistAngleBack->Fill(angle);
241
242 }
243 else if(fAlgorithm=="KF")
244 {
245 Int_t fPDGtrack1 = 11;
246 Int_t fPDGtrack2 = 11;
247
248 Float_t fCharge1 = track1->Charge();
249 Float_t fCharge2 = track2->Charge();
250
251 if(fCharge1>0) fPDGtrack1 = -11;
252 if(fCharge2>0) fPDGtrack2 = -11;
253
254 AliKFParticle fKFtrack1(*track1, fPDGtrack1);
255 AliKFParticle fKFtrack2(*track2, fPDGtrack2);
256 AliKFParticle fRecoGamma(fKFtrack1, fKFtrack2);
257
258 //Reconstruction Cuts
259 if(fRecoGamma.GetNDF()<1) continue;
260 Double_t chi2OverNDF = fRecoGamma.GetChi2()/fRecoGamma.GetNDF();
261 if(TMath::Sqrt(TMath::Abs(chi2OverNDF))>fChi2OverNDFCut) continue;
262
263 //Invariant Mass
264 Double_t imass;
265 Double_t width;
266 fRecoGamma.GetMass(imass,width);
267
268 //Opening Angle (Total Angle)
269 Double_t angle = fKFtrack1.GetAngle(fKFtrack2);
270
271 //Fill some histograms
272 if(fCharge1*fCharge2<0 && fHistAngle) fHistAngle->Fill(angle);
273 if(fCharge1*fCharge2>0 && fHistAngleBack) fHistAngleBack->Fill(angle);
274
7c4ec6e7 275 if(angle>fAngleCut) continue;
dfcc2025 276
277 if(imass<fMassCut)
278 {
279 if(fCharge1*fCharge2<0)
280 {
281 fIsULS=kTRUE;
282 fULSPartner[fNULS] = iTrack2;
283 fNULS++;
284 }
285 if(fCharge1*fCharge2>0)
286 {
287 fIsLS=kTRUE;
288 fLSPartner[fNLS] = iTrack2;
289 fNLS++;
290 }
291 }
292
293 //Fill some histograms
294 if(fCharge1*fCharge2<0 && fHistMass) fHistMass->Fill(imass);
295 if(fCharge1*fCharge2>0 && fHistMassBack) fHistMassBack->Fill(imass);
296
297 }
298 else
299 {
300 AliError( Form("Error: %s is not a valid algorithm option.",(const char*)fAlgorithm));
301 return;
302 }
303
304 }
305
306 return;
307}