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[u/mrichter/AliRoot.git] / PWGLF / SPECTRA / Kinks / AliResonanceKinkLikeSign.cxx
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10eaad41 1/**************************************************************************
2 * Author: Paraskevi Ganoti, University of Athens (pganoti@phys.uoa.gr) *
3 * Contributors are mentioned in the code where appropriate. *
4 * *
5 * Permission to use, copy, modify and distribute this software and its *
6 * documentation strictly for non-commercial purposes is hereby granted *
7 * without fee, provided that the above copyright notice appears in all *
8 * copies and that both the copyright notice and this permission notice *
9 * appear in the supporting documentation. The authors make no claims *
10 * about the suitability of this software for any purpose. It is *
11 * provided "as is" without express or implied warranty. *
12 **************************************************************************/
13
e3c296cd 14//----------------------------------------------------------------------------------------------------------------
10eaad41 15// class AliResonanceKinkLikeSign
16// Example of an analysis task for producing a like-sign background for resonances having at least one
17// kaon-kink in their decay products.
e3c296cd 18// Background is calculated from a positive kaon kink and a negative track.
19//-----------------------------------------------------------------------------------------------------------------
10eaad41 20
be1a7181 21#include "AliESDEvent.h"
10eaad41 22#include "TH1D.h"
7ccf0419 23#include "TH2D.h"
be1a7181 24#include "TF1.h"
25#include "TDatabasePDG.h"
10eaad41 26#include "TLorentzVector.h"
be1a7181 27#include "AliESDkink.h"
10eaad41 28
29#include "AliResonanceKinkLikeSign.h"
10eaad41 30
31ClassImp(AliResonanceKinkLikeSign)
32
10eaad41 33//________________________________________________________________________
34AliResonanceKinkLikeSign::AliResonanceKinkLikeSign(const char *name)
be1a7181 35 : AliAnalysisTaskSE(name), fDebug(0), fListOfHistos(0), f1(0), f2(0), fPosKaonLikeSign(0), fLikeSignInvmassPt(0), fMaxNSigmaToVertex(0), fMinPtTrackCut(0), fMaxDCAxy(0), fMaxDCAzaxis(0),
e3c296cd 36fMinTPCclusters(0),fMaxChi2PerTPCcluster(0), fMaxCov0(0), fMaxCov2(0), fMaxCov5(0) , fMaxCov9(0), fMaxCov14(0), fdaughter1pdg(0), fdaughter2pdg(0), fnbins(0), fnlowx(0), fnhighx(0), floweta(0), fuppereta(0), fminKinkRadius(0), fmaxKinkRadius(0), fminQt(0), fmaxQt(0), fptbins(0), flowpt(0), fupperpt(0), fmaxAbsEtaCut(0)
10eaad41 37
38{
39 // Constructor
40
41 // Define input and output slots here
42 // Input slot #0 works with a TChain
10eaad41 43 DefineOutput(1, TList::Class());
44}
45
46//________________________________________________________________________
be1a7181 47void AliResonanceKinkLikeSign::UserCreateOutputObjects()
10eaad41 48{
49 // Create histograms
50 // Called once
51
52 f1=new TF1("f1","((atan([0]*[1]*(1.0/(sqrt((x^2)*(1.0-([1]^2))-([0]^2)*([1]^2))))))*180.)/[2]",1.1,10.0);
53 f1->SetParameter(0,0.493677);
54 f1->SetParameter(1,0.9127037);
55 f1->SetParameter(2,TMath::Pi());
56
57 f2=new TF1("f2","((atan([0]*[1]*(1.0/(sqrt((x^2)*(1.0-([1]^2))-([0]^2)*([1]^2))))))*180.)/[2]",0.1,10.0);
58 f2->SetParameter(0,0.13957018);
59 f2->SetParameter(1,0.2731374);
60 f2->SetParameter(2,TMath::Pi());
61
be1a7181 62 fPosKaonLikeSign=new TH1D("fPosKaonLikeSign"," ", fnbins, fnlowx, fnhighx);
894840ad 63 fLikeSignInvmassPt=new TH2D("fLikeSignInvmassPt"," ", fnbins, fnlowx, fnhighx, fptbins, flowpt, fupperpt);
be1a7181 64
10eaad41 65 fListOfHistos=new TList();
7ccf0419 66 fListOfHistos->Add(fPosKaonLikeSign);
67 fListOfHistos->Add(fLikeSignInvmassPt);
10eaad41 68
69}
70
71//________________________________________________________________________
be1a7181 72void AliResonanceKinkLikeSign::UserExec(Option_t *)
10eaad41 73{
74 // Main loop
75 // Called for each event
76
be1a7181 77 AliVEvent *event = InputEvent();
78 if (!event) {
79 Printf("ERROR: Could not retrieve event");
80 return;
81 }
10eaad41 82
be1a7181 83 AliESDEvent* esd = dynamic_cast<AliESDEvent*>(event);
84 if (!esd) {
85 Printf("ERROR: Could not retrieve esd");
86 return;
87 }
f2a16059 88
be1a7181 89 Double_t daughter1Mass, daughter2Mass;
90
91 if (fdaughter1pdg==kKPlus) {
92 daughter1Mass=TDatabasePDG::Instance()->GetParticle(fdaughter1pdg)->Mass();
93 daughter2Mass=TDatabasePDG::Instance()->GetParticle(fdaughter2pdg)->Mass();
94 }
95
96 if (fdaughter1pdg!=kKPlus) {
97 daughter1Mass=TDatabasePDG::Instance()->GetParticle(fdaughter2pdg)->Mass();
98 daughter2Mass=TDatabasePDG::Instance()->GetParticle(fdaughter1pdg)->Mass();
99 } // to ensure that daughter1Mass has always the kaon mass
100
101 if (!esd) {
102 Printf("ERROR: esd not available");
10eaad41 103 return;
104 }
105
be1a7181 106 const AliESDVertex* vertex = GetEventVertex(esd);
10eaad41 107 if(!vertex) return;
108
109 Double_t ptrackpos[3], ptrackneg[3];
110
111 TLorentzVector p4pos;
112 TLorentzVector p4neg;
113 TLorentzVector p4comb;
114
be1a7181 115 for (Int_t iTracks = 0; iTracks < esd->GetNumberOfTracks(); iTracks++) {
116
117 AliESDtrack* trackpos = esd->GetTrack(iTracks);
10eaad41 118 if (!trackpos) {
1ac5c71d 119 if (fDebug > 0) Printf("ERROR: Could not receive track %d", iTracks);
10eaad41 120 continue;
121 }
7ccf0419 122 if (trackpos->GetSign() < 0) continue;
10eaad41 123
be1a7181 124 AliExternalTrackParam *tpcTrackpos = (AliExternalTrackParam *)trackpos->GetTPCInnerParam();
125 if(!tpcTrackpos) continue;
126 ptrackpos[0]=tpcTrackpos->Px();
127 ptrackpos[1]=tpcTrackpos->Py();
128 ptrackpos[2]=tpcTrackpos->Pz();
10eaad41 129
be1a7181 130 Bool_t firstLevelAcceptPosTrack=IsAcceptedForKink(esd, vertex, trackpos);
131 if(firstLevelAcceptPosTrack==kFALSE) continue;
10eaad41 132
133 TVector3 posTrackMom(ptrackpos[0],ptrackpos[1],ptrackpos[2]);
10eaad41 134
be1a7181 135 Int_t indexKinkPos=trackpos->GetKinkIndex(0);
136 Bool_t posKaonKinkFlag=0;
137 if(indexKinkPos<0) posKaonKinkFlag=IsKink(esd, indexKinkPos, posTrackMom);
138 if(posKaonKinkFlag==0) continue;
139 if(posKaonKinkFlag==1) p4pos.SetVectM(posTrackMom, daughter1Mass);
7ccf0419 140
be1a7181 141 for (Int_t j=0; j<esd->GetNumberOfTracks(); j++) {
10eaad41 142 if(iTracks==j) continue;
be1a7181 143 AliESDtrack* trackneg=esd->GetTrack(j);
144 if (!trackneg) {
145 if (fDebug > 0) Printf("ERROR: Could not receive track %d", j);
146 continue;
147 }
7ccf0419 148 if (trackneg->GetSign() < 0) continue;
10eaad41 149
be1a7181 150 AliExternalTrackParam *tpcTrackneg = (AliExternalTrackParam *)trackneg->GetTPCInnerParam();
151 if(!tpcTrackneg) continue;
152 ptrackneg[0]=tpcTrackneg->Px();
153 ptrackneg[1]=tpcTrackneg->Py();
154 ptrackneg[2]=tpcTrackneg->Pz();
155
156 Bool_t firstLevelAcceptNegTrack=IsAcceptedForKink(esd, vertex, trackneg);
157 if(firstLevelAcceptNegTrack==kFALSE) continue;
10eaad41 158
be1a7181 159 TVector3 negTrackMom(ptrackneg[0],ptrackneg[1],ptrackneg[2]);
10eaad41 160
be1a7181 161 Bool_t secondLevelAcceptNegTrack=IsAcceptedForTrack(esd, vertex, trackneg);
162 if(secondLevelAcceptNegTrack==kFALSE) continue;
163
164 p4neg.SetVectM(negTrackMom, daughter2Mass);
10eaad41 165
166 p4comb=p4pos;
167 p4comb+=p4neg;
be1a7181 168
894840ad 169 if(p4comb.Vect().Pt()<=fMinPtTrackCut) continue;
be1a7181 170
e3c296cd 171 if((TMath::Abs(p4pos.Vect().Eta())<fmaxAbsEtaCut)&&(TMath::Abs(p4neg.Vect().Eta())<fmaxAbsEtaCut)&&(p4comb.Vect().Eta()<fmaxAbsEtaCut)) {
be1a7181 172
173 fPosKaonLikeSign->Fill(p4comb.M());
174 fLikeSignInvmassPt->Fill(p4comb.M(), p4comb.Vect().Pt());
175
176 }
10eaad41 177
178 } //inner track loop
179
180 } //outer track loop
181
182 PostData(1, fListOfHistos);
183}
184
be1a7181 185//________________________________________________________________________
186void AliResonanceKinkLikeSign::Terminate(Option_t *)
187{
188
189}
190
10eaad41 191//____________________________________________________________________//
192
193Float_t AliResonanceKinkLikeSign::GetSigmaToVertex(AliESDtrack* esdTrack) const {
194 // Calculates the number of sigma to the vertex.
195
196 Float_t b[2];
197 Float_t bRes[2];
198 Float_t bCov[3];
199
200 esdTrack->GetImpactParameters(b,bCov);
201
202 if (bCov[0]<=0 || bCov[2]<=0) {
203 //AliDebug(1, "Estimated b resolution lower or equal zero!");
204 bCov[0]=0; bCov[2]=0;
205 }
206 bRes[0] = TMath::Sqrt(bCov[0]);
207 bRes[1] = TMath::Sqrt(bCov[2]);
208
209 if (bRes[0] == 0 || bRes[1] ==0) return -1;
210
211 Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
212
213 if (TMath::Exp(-d * d / 2) < 1e-10) return 1000;
214
215 d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
216
217 return d;
218}
219
220//____________________________________________________________________//
221
222const AliESDVertex* AliResonanceKinkLikeSign::GetEventVertex(const AliESDEvent* esd) const
223
224{
225 // Get the vertex
226
227 const AliESDVertex* vertex = esd->GetPrimaryVertex();
228
229 if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
230 else
231 {
232 vertex = esd->GetPrimaryVertexSPD();
233 if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
234 else
235 return 0;
236 }
237}
238
be1a7181 239//________________________________________________________________________
240
241 Bool_t AliResonanceKinkLikeSign::IsAcceptedForKink(AliESDEvent *localesd,
242 const AliESDVertex *localvertex, AliESDtrack* localtrack) {
243 // Apply the selections for each kink
244
245 Double_t gPt = 0.0, gPx = 0.0, gPy = 0.0, gPz = 0.0;
246 Double_t dca[2] = {0.0,0.0}, cov[3] = {0.0,0.0,0.0}; //The impact parameters and their covariance.
247 Double_t dca3D = 0.0;
248
249 AliExternalTrackParam *tpcTrack = (AliExternalTrackParam *)localtrack->GetTPCInnerParam();
250 if(!tpcTrack) {
251 gPt = 0.0; gPx = 0.0; gPy = 0.0; gPz = 0.0;
252 dca[0] = -100.; dca[1] = -100.; dca3D = -100.;
253 cov[0] = -100.; cov[1] = -100.; cov[2] = -100.;
254 }
255 else {
256 gPt = tpcTrack->Pt();
257 gPx = tpcTrack->Px();
258 gPy = tpcTrack->Py();
259 gPz = tpcTrack->Pz();
260 tpcTrack->PropagateToDCA(localvertex,
261 localesd->GetMagneticField(),100.,dca,cov);
262 }
263
264 if(GetSigmaToVertex(localtrack) > fMaxNSigmaToVertex) {
265 if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a %lf sigmas to vertex TPC (max. requested: %lf)", GetSigmaToVertex(localtrack),fMaxNSigmaToVertex);
266 return kFALSE;
267 }
268
269 if(TMath::Abs(dca[0]) > fMaxDCAxy) {
270 if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a value of dca(xy) (TPC) of %lf (max. requested: %lf)", TMath::Abs(dca[0]), fMaxDCAxy);
271 return kFALSE;
272 }
273
274 if(TMath::Abs(dca[1]) > fMaxDCAzaxis) {
275 if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a value of dca(z) of %lf (max. requested: %lf)", TMath::Abs(dca[1]), fMaxDCAzaxis);
276 return kFALSE;
277 }
278
279 if(gPt <= fMinPtTrackCut) {
280 if (fDebug > 1) Printf("IsAcceptedKink: Track rejected because it has a min value of pt of %lf (min. requested: %lf)", gPt, fMinPtTrackCut);
281 return kFALSE;
282 }
283
284 return kTRUE;
285}
286
287//________________________________________________________________________
288Bool_t AliResonanceKinkLikeSign::IsAcceptedForTrack(AliESDEvent *localesd, const AliESDVertex *localvertex, AliESDtrack *localtrack) {
289 // Apply the selections for each track
290
291 Double_t gPt = 0.0, gPx = 0.0, gPy = 0.0, gPz = 0.0;
292 Double_t dca[2] = {0.0,0.0}, cov[3] = {0.0,0.0,0.0}; //The impact parameters and their covariance.
293 Double_t dca3D = 0.0;
294
295 AliExternalTrackParam *tpcTrack = (AliExternalTrackParam *)localtrack->GetTPCInnerParam();
296 if(!tpcTrack) {
297 gPt = 0.0; gPx = 0.0; gPy = 0.0; gPz = 0.0;
298 dca[0] = -100.; dca[1] = -100.; dca3D = -100.;
299 cov[0] = -100.; cov[1] = -100.; cov[2] = -100.;
300 }
301 else {
302 gPt = tpcTrack->Pt();
303 gPx = tpcTrack->Px();
304 gPy = tpcTrack->Py();
305 gPz = tpcTrack->Pz();
306 tpcTrack->PropagateToDCA(localvertex,
307 localesd->GetMagneticField(),100.,dca,cov);
308 }
309
310 Int_t fcls[200];
311 Int_t nClustersTPC=localtrack->GetTPCclusters(fcls);
312 Float_t chi2perTPCcluster=-1.0;
313 if(nClustersTPC!=0) chi2perTPCcluster=(localtrack->GetTPCchi2())/Float_t(nClustersTPC);
314
315 Double_t extCov[15];
316 localtrack->GetExternalCovariance(extCov);
317
318 if((localtrack->GetStatus() & AliESDtrack::kTPCrefit) == 0) {
319 if (fDebug > 1) Printf("IsAccepted: Track rejected because of no refited in TPC");
320 return kFALSE;
321 }
322
323 if(nClustersTPC < fMinTPCclusters) {
44b5c57e 324 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of nclusters (TPC) of %d (min. requested: %d)", nClustersTPC, fMinTPCclusters);
be1a7181 325 return kFALSE;
326 }
327
328 if(chi2perTPCcluster > fMaxChi2PerTPCcluster) {
329 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of chi2perTPCcluster of %lf (max. requested: %lf)", chi2perTPCcluster, fMaxChi2PerTPCcluster);
330 return kFALSE;
331 }
332
333 if(extCov[0] > fMaxCov0) {
9ee1c45f 334 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[0] of %lf (max. requested: %lf)", extCov[0], fMaxCov0);
be1a7181 335 return kFALSE;
336 }
337
338 if(extCov[2] > fMaxCov2) {
9ee1c45f 339 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[2] of %lf (max. requested: %lf)", extCov[2], fMaxCov2);
be1a7181 340 return kFALSE;
341 }
342
343 if(extCov[5] > fMaxCov5) {
9ee1c45f 344 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[5] of %lf (max. requested: %lf)", extCov[5], fMaxCov5);
be1a7181 345 return kFALSE;
346 }
347
348 if(extCov[9] > fMaxCov9) {
9ee1c45f 349 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[9] of %lf (max. requested: %lf)", extCov[9], fMaxCov9);
be1a7181 350 return kFALSE;
351 }
352
353 if(extCov[14] > fMaxCov14) {
9ee1c45f 354 if (fDebug > 1) Printf("IsAccepted: Track rejected because it has a value of cov[14] of %lf (max. requested: %lf)", extCov[14], fMaxCov14);
be1a7181 355 return kFALSE;
356 }
357
358 return kTRUE;
359
360}
361
362//________________________________________________________________________
363Bool_t AliResonanceKinkLikeSign::IsKink(AliESDEvent *localesd, Int_t kinkIndex, TVector3 trackMom)
364{
365 // Test some kinematical criteria for each kink
366
367 AliESDkink *kink=localesd->GetKink(TMath::Abs(kinkIndex)-1);
368 const TVector3 motherMfromKink(kink->GetMotherP());
369 const TVector3 daughterMKink(kink->GetDaughterP());
370 Float_t qt=kink->GetQt();
371
372 Double_t maxDecAngKmu=f1->Eval(motherMfromKink.Mag(),0.,0.,0.);
373 Double_t maxDecAngpimu=f2->Eval(motherMfromKink.Mag(),0.,0.,0.);
374
375 Float_t kinkAngle=TMath::RadToDeg()*kink->GetAngle(2);
376
377 Float_t energyDaughterMu=TMath::Sqrt(daughterMKink.Mag()*daughterMKink.Mag()+0.105658*0.105658);
378 Float_t p1XM= motherMfromKink.Px();
379 Float_t p1YM= motherMfromKink.Py();
380 Float_t p1ZM= motherMfromKink.Pz();
381 Float_t p2XM= daughterMKink.Px();
382 Float_t p2YM= daughterMKink.Py();
383 Float_t p2ZM= daughterMKink.Pz();
384 Float_t p3Daughter=TMath::Sqrt(((p1XM-p2XM)*(p1XM-p2XM))+((p1YM-p2YM)*(p1YM-p2YM))+((p1ZM-p2ZM)*(p1ZM-p2ZM)));
385 Double_t invariantMassKmu= TMath::Sqrt((energyDaughterMu+p3Daughter)*(energyDaughterMu+p3Daughter)-motherMfromKink.Mag()*motherMfromKink.Mag());
386
e3c296cd 387 if((kinkAngle>maxDecAngpimu)&&(qt>fminQt)&&(qt<fmaxQt)&&((kink->GetR()>fminKinkRadius)&&(kink->GetR()<fmaxKinkRadius))&&(TMath::Abs(trackMom.Eta())<fmaxAbsEtaCut)&&(invariantMassKmu<0.6)) {
be1a7181 388
389 if(trackMom.Mag()<=1.1) {
390 return kTRUE;
391 }
392 else
393 if (kinkAngle<maxDecAngKmu) {
394 return kTRUE;
395 }
396 }
397 return kFALSE;
398}