Rulechecker-complying update from P.Ganoti (pganoti@phys.uoa.gr)
[u/mrichter/AliRoot.git] / PWG2 / KINK / 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
14//----------------------------------------------------------------------------------------------------------------
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.
7ccf0419 18// Background is calculated from a positive kaon kink and a negative track.
10eaad41 19//-----------------------------------------------------------------------------------------------------------------
20
21#include "TChain.h"
22#include "TTree.h"
23#include "TVector3.h"
24#include "TF1.h"
25#include "TH1D.h"
7ccf0419 26#include "TH2D.h"
f27d6e67 27#include <TDatabasePDG.h>
28#include <TParticlePDG.h>
10eaad41 29#include "TLorentzVector.h"
30#include "AliAnalysisTaskSE.h"
31#include "AliAnalysisManager.h"
32
33#include "AliESDInputHandler.h"
34
35#include "AliResonanceKinkLikeSign.h"
36#include "AliESDkink.h"
37
38ClassImp(AliResonanceKinkLikeSign)
39
40//________________________________________________________________________
41AliResonanceKinkLikeSign::AliResonanceKinkLikeSign()
7ccf0419 42 : AliAnalysisTaskSE(), fESD(0), fListOfHistos(0), f1(0), f2(0), fPosKaonLikeSign(0), fLikeSignInvmassPt(0)
10eaad41 43{
44 // Constructor
45}
46
47//________________________________________________________________________
48AliResonanceKinkLikeSign::AliResonanceKinkLikeSign(const char *name)
7ccf0419 49 : AliAnalysisTaskSE(name), fESD(0), fListOfHistos(0), f1(0), f2(0), fPosKaonLikeSign(0), fLikeSignInvmassPt(0)
10eaad41 50
51{
52 // Constructor
53
54 // Define input and output slots here
55 // Input slot #0 works with a TChain
56 DefineInput(0, TChain::Class());
57 DefineOutput(1, TList::Class());
58}
59
60//________________________________________________________________________
61void AliResonanceKinkLikeSign::ConnectInputData(Option_t *)
62{
63 // Connect ESD or AOD here
64 // Called once
10eaad41 65
66 TTree* tree = dynamic_cast<TTree*> (GetInputData(0));
67 if (!tree) {
68 Printf("ERROR: Could not read chain from input slot 0");
69 } else {
f27d6e67 70
10eaad41 71 AliESDInputHandler *esdH = dynamic_cast<AliESDInputHandler*> (AliAnalysisManager::GetAnalysisManager()->GetInputEventHandler());
72
73 if (!esdH) {
74 Printf("ERROR: Could not get ESDInputHandler");
75 } else
76 fESD = esdH->GetEvent();
77 }
78}
79
80//________________________________________________________________________
81void AliResonanceKinkLikeSign::CreateOutputObjects()
82{
83 // Create histograms
84 // Called once
85
86 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);
87 f1->SetParameter(0,0.493677);
88 f1->SetParameter(1,0.9127037);
89 f1->SetParameter(2,TMath::Pi());
90
91 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);
92 f2->SetParameter(0,0.13957018);
93 f2->SetParameter(1,0.2731374);
94 f2->SetParameter(2,TMath::Pi());
95
96 //OpenFile(1); //uncomment for proof analysis
97
98 // for K*0(892)
7ccf0419 99 fPosKaonLikeSign=new TH1D("fPosKaonLikeSign"," ", 60,0.6,1.2);
100 fLikeSignInvmassPt=new TH2D("fLikeSignInvmassPt"," ", 60,0.6,1.2, 100,0.0,10.0);
10eaad41 101
102 // for phi(1020)
7ccf0419 103 // fPosKaonLikeSign=new TH1D("fPosKaonLikeSign"," ", 70,0.99,1.088);
10eaad41 104
105
106 fListOfHistos=new TList();
7ccf0419 107 fListOfHistos->Add(fPosKaonLikeSign);
108 fListOfHistos->Add(fLikeSignInvmassPt);
10eaad41 109
110}
111
112//________________________________________________________________________
113void AliResonanceKinkLikeSign::Exec(Option_t *)
114{
115 // Main loop
116 // Called for each event
117
f27d6e67 118 Double_t daughter1Mass=TDatabasePDG::Instance()->GetParticle(kKPlus)->Mass();
119 Double_t daughter2Mass=TDatabasePDG::Instance()->GetParticle(kPiPlus)->Mass();
10eaad41 120
121 if (!fESD) {
122 Printf("ERROR: fESD not available");
123 return;
124 }
125
126 const AliESDVertex* vertex = GetEventVertex(fESD);
127 if(!vertex) return;
128
129 Double_t ptrackpos[3], ptrackneg[3];
130
131 TLorentzVector p4pos;
132 TLorentzVector p4neg;
133 TLorentzVector p4comb;
134
135 for (Int_t iTracks = 0; iTracks < fESD->GetNumberOfTracks(); iTracks++) {
136 AliESDtrack* trackpos = fESD->GetTrack(iTracks);
137 if (!trackpos) {
1ac5c71d 138 if (fDebug > 0) Printf("ERROR: Could not receive track %d", iTracks);
10eaad41 139 continue;
140 }
141
7ccf0419 142 if (trackpos->GetSign() < 0) continue;
10eaad41 143
144 trackpos->GetPxPyPz(ptrackpos);
145
146 Float_t nSigmaToVertex = GetSigmaToVertex(trackpos);
147
148 Float_t bpos[2];
149 Float_t bCovpos[3];
150 trackpos->GetImpactParameters(bpos,bCovpos);
151
152 if (bCovpos[0]<=0 || bCovpos[2]<=0) {
1ac5c71d 153 if (fDebug > 0) Printf("Estimated b resolution lower or equal zero!");
10eaad41 154 bCovpos[0]=0; bCovpos[2]=0;
155 }
156
157 Float_t dcaToVertexXYpos = bpos[0];
158 Float_t dcaToVertexZpos = bpos[1];
159
160 if(nSigmaToVertex>=4) continue;
161 if((dcaToVertexXYpos>3.0)||(dcaToVertexZpos>3.0)) continue;
162
163 TVector3 posTrackMom(ptrackpos[0],ptrackpos[1],ptrackpos[2]);
164
165 if(posTrackMom.Perp()<=0.25) continue;
166
7ccf0419 167 //Uncomment the following block if the Like Sign is made of K+ kink + positive track
10eaad41 168
04c3c355 169 Int_t indexKink=trackpos->GetKinkIndex(0);
7ccf0419 170 Int_t kaonKinkFlag=0;
04c3c355 171 if(indexKink<0){
7ccf0419 172
04c3c355 173 AliESDkink *kink=fESD->GetKink(TMath::Abs(indexKink)-1);
7ccf0419 174 const TVector3 motherMfromKink(kink->GetMotherP());
175 const TVector3 daughterMKink(kink->GetDaughterP());
176 Float_t qt=kink->GetQt();
177
178 Double_t maxDecAngKmu=f1->Eval(motherMfromKink.Mag(),0.,0.,0.);
179 Double_t maxDecAngpimu=f2->Eval(motherMfromKink.Mag(),0.,0.,0.);
180
181 Float_t kinkAngle=TMath::RadToDeg()*kink->GetAngle(2);
182
183 Float_t energyDaughterMu=TMath::Sqrt(daughterMKink.Mag()*daughterMKink.Mag()+0.105658*0.105658);
184 Float_t p1XM= motherMfromKink.Px();
185 Float_t p1YM= motherMfromKink.Py();
186 Float_t p1ZM= motherMfromKink.Pz();
187 Float_t p2XM= daughterMKink.Px();
188 Float_t p2YM= daughterMKink.Py();
189 Float_t p2ZM= daughterMKink.Pz();
190 Float_t p3Daughter=TMath::Sqrt(((p1XM-p2XM)*(p1XM-p2XM))+((p1YM-p2YM)*(p1YM-p2YM))+((p1ZM-p2ZM)*(p1ZM-p2ZM)));
191 Double_t invariantMassKmu= TMath::Sqrt((energyDaughterMu+p3Daughter)*(energyDaughterMu+p3Daughter)-motherMfromKink.Mag()*motherMfromKink.Mag());
192
193 if((kinkAngle>maxDecAngpimu)&&(qt>0.05)&&(qt<0.25)&&((kink->GetR()>110.)&&(kink->GetR()<230.))&&(TMath::Abs(posTrackMom.Eta())<1.1)&&(invariantMassKmu<0.6)) {
194
195 if(posTrackMom.Mag()<=1.1) {
196 kaonKinkFlag=1;
197 }
198 else
199 if (kinkAngle<maxDecAngKmu) {
200 kaonKinkFlag=1;
201 }
202 }
203
204 } //End Kink Information
205
206 if(kaonKinkFlag==0) continue;
207 if(kaonKinkFlag==1) p4pos.SetVectM(posTrackMom,daughter1Mass);
208
209 // Comment the following statements till the "for" if the Like Sign of K+ kink + positive track is needed
210
211// UInt_t status=trackpos->GetStatus();
212// if((status&AliESDtrack::kTPCrefit)==0) continue;
213// if(trackpos->GetTPCclusters(0)<50) continue;
214// if((trackpos->GetTPCchi2()/trackpos->GetTPCclusters(0))>3.5) continue;
215// Double_t extCovPos[15];
216// trackpos->GetExternalCovariance(extCovPos);
217// if(extCovPos[0]>2) continue;
218// if(extCovPos[2]>2) continue;
219// if(extCovPos[5]>0.5) continue;
220// if(extCovPos[9]>0.5) continue;
221// if(extCovPos[14]>2) continue;
10eaad41 222//
7ccf0419 223// p4pos.SetVectM(posTrackMom,daughter1Mass);
10eaad41 224
225 for (Int_t j=0; j<fESD->GetNumberOfTracks(); j++) {
226 if(iTracks==j) continue;
227 AliESDtrack* trackneg=fESD->GetTrack(j);
7ccf0419 228 if (trackneg->GetSign() < 0) continue;
10eaad41 229
230 trackneg->GetPxPyPz(ptrackneg);
231 Float_t negSigmaToVertex = GetSigmaToVertex(trackneg);
232
233 Float_t bneg[2];
234 Float_t bCovneg[3];
235 trackneg->GetImpactParameters(bneg,bCovneg);
236 if (bCovneg[0]<=0 || bCovneg[2]<=0) {
1ac5c71d 237 if (fDebug > 0) Printf("Estimated b resolution lower or equal zero!");
10eaad41 238 bCovneg[0]=0; bCovneg[2]=0;
239 }
240
241 Float_t dcaToVertexXYneg = bneg[0];
242 Float_t dcaToVertexZneg = bneg[1];
243
244 if(negSigmaToVertex>=4) continue;
245 if((dcaToVertexXYneg>3.0)||(dcaToVertexZneg>3.0)) continue;
246
247 TVector3 negTrackMom(ptrackneg[0],ptrackneg[1],ptrackneg[2]);
248
249 if(negTrackMom.Perp()<=0.25) continue;
250
251 UInt_t statusneg=trackneg->GetStatus();
252
253 if((statusneg&AliESDtrack::kTPCrefit)==0) continue;
254
255 if(trackneg->GetTPCclusters(0)<50) continue;
256 if((trackneg->GetTPCchi2()/trackneg->GetTPCclusters(0))>3.5) continue;
257 Double_t extCovneg[15];
258 trackneg->GetExternalCovariance(extCovneg);
259 if(extCovneg[0]>2) continue;
260 if(extCovneg[2]>2) continue;
261 if(extCovneg[5]>0.5) continue;
262 if(extCovneg[9]>0.5) continue;
263 if(extCovneg[14]>2) continue;
264
265 p4neg.SetVectM(negTrackMom, daughter2Mass);
266
267 p4comb=p4pos;
268 p4comb+=p4neg;
7ccf0419 269 fPosKaonLikeSign->Fill(p4comb.M());
270 fLikeSignInvmassPt->Fill(p4comb.M(), p4comb.Vect().Pt());
10eaad41 271
272 } //inner track loop
273
274 } //outer track loop
275
276 PostData(1, fListOfHistos);
277}
278
279//________________________________________________________________________
280void AliResonanceKinkLikeSign::Terminate(Option_t *)
281{
282
283}
284
285//____________________________________________________________________//
286
287Float_t AliResonanceKinkLikeSign::GetSigmaToVertex(AliESDtrack* esdTrack) const {
288 // Calculates the number of sigma to the vertex.
289
290 Float_t b[2];
291 Float_t bRes[2];
292 Float_t bCov[3];
293
294 esdTrack->GetImpactParameters(b,bCov);
295
296 if (bCov[0]<=0 || bCov[2]<=0) {
297 //AliDebug(1, "Estimated b resolution lower or equal zero!");
298 bCov[0]=0; bCov[2]=0;
299 }
300 bRes[0] = TMath::Sqrt(bCov[0]);
301 bRes[1] = TMath::Sqrt(bCov[2]);
302
303 if (bRes[0] == 0 || bRes[1] ==0) return -1;
304
305 Float_t d = TMath::Sqrt(TMath::Power(b[0]/bRes[0],2) + TMath::Power(b[1]/bRes[1],2));
306
307 if (TMath::Exp(-d * d / 2) < 1e-10) return 1000;
308
309 d = TMath::ErfInverse(1 - TMath::Exp(-d * d / 2)) * TMath::Sqrt(2);
310
311 return d;
312}
313
314//____________________________________________________________________//
315
316const AliESDVertex* AliResonanceKinkLikeSign::GetEventVertex(const AliESDEvent* esd) const
317
318{
319 // Get the vertex
320
321 const AliESDVertex* vertex = esd->GetPrimaryVertex();
322
323 if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
324 else
325 {
326 vertex = esd->GetPrimaryVertexSPD();
327 if((vertex->GetStatus()==kTRUE)&&(vertex->GetNContributors()>2)) return vertex;
328 else
329 return 0;
330 }
331}
332