1 /**************************************************************************
2 * Copyright(c) 1998-2008, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
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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 **************************************************************************/
18 /////////////////////////////////////////////////////////////
20 // Class for AOD reconstructed heavy-flavour cascades
22 // Author: X-M. Zhang, zhangxm@iopp.ccnu.edu.cn
23 /////////////////////////////////////////////////////////////
26 #include <TDatabasePDG.h>
27 #include <TClonesArray.h>
28 #include "AliAODMCParticle.h"
29 #include "AliAODRecoDecay.h"
30 #include "AliAODVertex.h"
31 #include "AliAODRecoDecayHF2Prong.h"
32 #include "AliAODRecoCascadeHF.h"
34 ClassImp(AliAODRecoCascadeHF)
35 //-----------------------------------------------------------------------------
37 AliAODRecoCascadeHF::AliAODRecoCascadeHF() :
38 AliAODRecoDecayHF2Prong()
41 // Default Constructor
44 //-----------------------------------------------------------------------------
45 AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
46 Double_t *px, Double_t *py, Double_t *pz,
47 Double_t *d0, Double_t *d0err, Double_t dca) :
48 AliAODRecoDecayHF2Prong(vtx2, px, py, pz, d0, d0err, dca)
51 // Constructor with AliAODVertex for decay vertex
55 //-----------------------------------------------------------------------------
56 AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
57 Double_t *d0, Double_t *d0err, Double_t dca) :
58 AliAODRecoDecayHF2Prong(vtx2, d0, d0err, dca)
61 // Constructor with decay vertex and without prongs momenta
65 //-----------------------------------------------------------------------------
66 AliAODRecoCascadeHF::AliAODRecoCascadeHF(const AliAODRecoCascadeHF &source) :
67 AliAODRecoDecayHF2Prong(source)
73 //-----------------------------------------------------------------------------
74 AliAODRecoCascadeHF &AliAODRecoCascadeHF::operator=(const AliAODRecoCascadeHF &source)
77 // assignment operator
79 if(&source == this) return *this;
81 AliAODRecoDecayHF2Prong::operator=(source);
85 //-----------------------------------------------------------------------------
86 AliAODRecoCascadeHF::~AliAODRecoCascadeHF()
92 //-----------------------------------------------------------------------------
93 Double_t AliAODRecoCascadeHF::InvMassDstarKpipi() const
96 // 3 prong invariant mass of the D0 daughters and the soft pion
100 e[0]=Get2Prong()->EProng(0,211);
101 e[1]=Get2Prong()->EProng(1,321);
103 e[0]=Get2Prong()->EProng(0,321);
104 e[1]=Get2Prong()->EProng(1,211);
108 Double_t esum = e[0]+e[1]+e[2];
109 Double_t minv = TMath::Sqrt(esum*esum-P()*P());
113 //----------------------------------------------------------------------------
114 Int_t AliAODRecoCascadeHF::MatchToMC(Int_t pdgabs,Int_t pdgabs2prong,
115 Int_t *pdgDg,Int_t *pdgDg2prong,
116 TClonesArray *mcArray, Bool_t isV0) const
119 // Check if this candidate is matched to a MC signal
121 // If yes, return label (>=0) of the AliAODMCParticle
124 Int_t ndg=GetNDaughters();
126 AliError("No daughters available");
131 ( (pdgDg[1]==2212 && pdgDg[0]==310) ||
132 (pdgDg[1]==211 && pdgDg[0]==3122) ) ) {
133 AliWarning("Please, pay attention: first element in AliAODRecoCascadeHF object must be the bachelor and second one V0. Skipping!");
137 Int_t lab2Prong = -1;
140 AliAODRecoDecayHF2Prong *the2Prong = Get2Prong();
141 lab2Prong = the2Prong->MatchToMC(pdgabs2prong,mcArray,2,pdgDg2prong);
143 AliAODv0 *theV0 = dynamic_cast<AliAODv0*>(Getv0());
144 lab2Prong = theV0->MatchToMC(pdgabs2prong,mcArray,2,pdgDg2prong);
147 if(lab2Prong<0) return -1;
149 Int_t dgLabels[10]={0,0,0,0,0,0,0,0,0,0};
151 // loop on daughters and write labels
152 for(Int_t i=0; i<ndg; i++) {
153 AliVTrack *trk = dynamic_cast<AliVTrack*>(GetDaughter(i));
155 Int_t lab = trk->GetLabel();
156 if(lab==-1) { // this daughter is the 2prong
158 } else if(lab<-1) continue;
162 Int_t finalLabel = AliAODRecoDecay::MatchToMC(pdgabs,mcArray,dgLabels,2,2,pdgDg);
165 // debug printouts for Lc->V0 bachelor case
167 if ( isV0 && (dgLabels[0]!=-1 && dgLabels[1]!=-1) ) {
168 AliAODv0 *theV0 = dynamic_cast<AliAODv0*>(Getv0());
169 Bool_t onTheFly = theV0->GetOnFlyStatus();
170 if (pdgDg[0]==2212 && pdgDg[1]==310) {
171 AliAODMCParticle*k0s = dynamic_cast<AliAODMCParticle*>(mcArray->At(lab2Prong));
173 Int_t labK0 = k0s->GetMother();
174 AliAODMCParticle*k0bar = dynamic_cast<AliAODMCParticle*>(mcArray->At(labK0));
176 AliDebug(1,Form(" (onTheFly=%1d) LabelV0=%d (%d) -> LabelK0S=%d (%d -> %d %d)",onTheFly,labK0,k0bar->GetPdgCode(),lab2Prong,pdgabs2prong,pdgDg2prong[0],pdgDg2prong[1]));
177 AliDebug(1,Form(" LabelLc=%d (%d) -> LabelBachelor=%d (%d) LabelV0=%d (%d)",
179 dgLabels[0],pdgDg[0],dgLabels[1],pdgDg[1]));
182 } else if (pdgDg[0]==211 && pdgDg[1]==3122) {
183 AliDebug(1,Form(" (onTheFly=%1d) LabelV0=%d (%d -> %d %d)",onTheFly,lab2Prong,pdgabs2prong,pdgDg2prong[0],pdgDg2prong[1]));
184 AliDebug(1,Form(" LabelLc=%d (%d) -> LabelBachelor=%d (%d) LabelV0=%d (%d)",
186 dgLabels[0],pdgDg[0],dgLabels[1],pdgDg[1]));
195 //-----------------------------------------------------------------------------
196 Bool_t AliAODRecoCascadeHF::SelectDstar(const Double_t *cutsDstar,
197 const Double_t *cutsD0,
201 // cutsDstar[0] = inv. mass half width of D* [GeV]
202 // cutsDstar[1] = half width of (M_Kpipi-M_D0) [GeV]
203 // cutsDstar[2] = PtMin of pi_s [GeV/c]
204 // cutsDstar[3] = PtMax of pi_s [GeV/c]
205 // cutsDstar[4] = theta, angle between the pi_s and decay plane of the D0 [rad]
207 // cutsD0[0] = inv. mass half width [GeV]
208 // cutsD0[1] = dca [cm]
209 // cutsD0[2] = cosThetaStar
210 // cutsD0[3] = pTK [GeV/c]
211 // cutsD0[4] = pTPi [GeV/c]
212 // cutsD0[5] = d0K [cm] upper limit!
213 // cutsD0[6] = d0Pi [cm] upper limit!
214 // cutsD0[7] = d0d0 [cm^2]
215 // cutsD0[8] = cosThetaPoint
218 // check that the D0 passes the cuts
219 // (if we have a D*+, it has to pass as D0,
220 // if we have a D*-, it has to pass as D0bar)
223 Int_t okD0=0,okD0bar=0;
224 Get2Prong()->SelectD0(cutsD0,okD0,okD0bar);
225 if((Charge()==+1 && !okD0) || (Charge()==-1 && !okD0bar)) return kFALSE;
228 if( (PtProng(0)<cutsDstar[2]) || (PtProng(0)>cutsDstar[3]) ) return kFALSE;
230 Double_t mDstar = TDatabasePDG::Instance()->GetParticle(413)->Mass();
231 Double_t invmDstar = InvMassDstarKpipi();
232 if(TMath::Abs(mDstar-invmDstar)>cutsDstar[0]) return kFALSE;
234 Double_t mD0 = TDatabasePDG::Instance()->GetParticle(421)->Mass();
235 if(TMath::Abs((mDstar-mD0)-DeltaInvMass())>cutsDstar[1]) return kFALSE;
237 Double_t theta = AngleD0dkpPisoft();
238 if(theta>cutsDstar[4]) return kFALSE;
242 //-----------------------------------------------------------------------------
243 Bool_t AliAODRecoCascadeHF::SelectLctoV0(const Double_t *cutsLctoV0,
244 Bool_t okLck0sp, Bool_t okLcLpi, Bool_t okLcLbarpi) const
246 // cuts on Lambdac candidates to V0+bachelor
247 // (to be passed to AliAODRecoDecayHF3Prong::SelectLctoV0())
248 // 0 = inv. mass half width in K0s hypothesis [GeV]
249 // 1 = inv. mass half width in Lambda hypothesis [GeV]
250 // 2 = inv. mass V0 in K0s hypothesis half width [GeV]
251 // 3 = inv. mass V0 in Lambda hypothesis half width [GeV]
252 // 4 = pT min Bachelor track [GeV/c]
253 // 5 = pT min V0-Positive track [GeV/c]
254 // 6 = pT min V0-Negative track [GeV/c]
255 // 7 = dca cut on the cascade (cm)
256 // 8 = dca cut on the V0 (cm)
258 // if ( !Getv0() || !Getv0PositiveTrack() || !Getv0NegativeTrack() )
259 // { AliInfo(Form("Not adapted for ESDv0s, return true...")); return false; }
261 Double_t mLck0sp,mLcLpi;
262 okLck0sp=1; okLcLpi=1; okLcLbarpi=1;
264 Double_t mLcPDG = TDatabasePDG::Instance()->GetParticle(4122)->Mass();
265 Double_t mk0sPDG = TDatabasePDG::Instance()->GetParticle(310)->Mass();
266 Double_t mLPDG = TDatabasePDG::Instance()->GetParticle(3122)->Mass();
269 double mk0s = Getv0()->MassK0Short();
270 mLck0sp = InvMassLctoK0sP();
273 double mlambda = Getv0()->MassLambda();
274 double malambda = Getv0()->MassAntiLambda();
275 mLcLpi = InvMassLctoLambdaPi();
278 // with k0s p hypothesis
279 if(TMath::Abs(mLck0sp-mLcPDG)>cutsLctoV0[0]) okLck0sp = 0;
280 // with Lambda pi hypothesis
281 if(TMath::Abs(mLcLpi-mLcPDG)>cutsLctoV0[1]) okLcLpi = 0;
282 okLcLbarpi = okLcLpi;
284 // cuts on the v0 mass
285 if( TMath::Abs(mk0s-mk0sPDG)>cutsLctoV0[2]) okLck0sp = 0;
286 //if( TMath::Abs(mlambda-mLPDG)>cutsLctoV0[3] &&
287 //TMath::Abs(malambda-mLPDG)>cutsLctoV0[3] ) okLcLpi = 0;
288 if( !(GetBachelor()->Charge()==+1 && TMath::Abs(mlambda-mLPDG)<=cutsLctoV0[3]) ) okLcLpi = 0;
289 if( !(GetBachelor()->Charge()==-1 && TMath::Abs(malambda-mLPDG)<=cutsLctoV0[3]) ) okLcLbarpi = 0;
291 if(!okLck0sp && !okLcLpi && !okLcLbarpi) return 0;
293 // cuts on the minimum pt of the tracks
294 if(TMath::Abs(GetBachelor()->Pt()) < cutsLctoV0[4]) return 0;
295 if(TMath::Abs(Getv0PositiveTrack()->Pt()) < cutsLctoV0[5]) return 0;
296 if(TMath::Abs(Getv0NegativeTrack()->Pt()) < cutsLctoV0[6]) return 0;
298 // cut on the cascade dca
299 if( TMath::Abs(GetDCA(0))>cutsLctoV0[7] //||
300 //TMath::Abs(Getv0()->DcaPosToPrimVertex())>cutsLctoV0[7] ||
301 //TMath::Abs(Getv0()->DcaNegToPrimVertex())>cutsLctoV0[7]
305 if(TMath::Abs(Getv0()->DcaV0Daughters()) > cutsLctoV0[8]) return 0;
307 // cut on V0 cosine of pointing angle wrt PV
308 if (CosV0PointingAngle() < cutsLctoV0[9]) { // cosine of V0 pointing angle wrt primary vertex
309 AliDebug(4,Form(" V0 cosine of pointing angle doesn't pass the cut"));
313 // cut on bachelor transverse impact parameter wrt PV
314 if (TMath::Abs(Getd0Prong(0)) > cutsLctoV0[10]) { // bachelor transverse impact parameter wrt PV
315 AliDebug(4,Form(" bachelor transverse impact parameter doesn't pass the cut"));
319 // cut on V0 transverse impact parameter wrt PV
320 if (TMath::Abs(Getd0Prong(1)) > cutsLctoV0[11]) { // V0 transverse impact parameter wrt PV
321 AliDebug(4,Form(" V0 transverse impact parameter doesn't pass the cut"));
325 // cut on K0S invariant mass veto
326 if (TMath::Abs(Getv0()->MassK0Short()-mk0sPDG) < cutsLctoV0[12]) { // K0S invariant mass veto
327 AliDebug(4,Form(" veto on K0S invariant mass doesn't pass the cut"));
331 // cut on Lambda/LambdaBar invariant mass veto
332 if (TMath::Abs(Getv0()->MassLambda()-mLPDG) < cutsLctoV0[13] ||
333 TMath::Abs(Getv0()->MassAntiLambda()-mLPDG) < cutsLctoV0[13] ) { // Lambda/LambdaBar invariant mass veto
334 AliDebug(4,Form(" veto on K0S invariant mass doesn't pass the cut"));
338 // cut on gamma invariant mass veto
339 if (Getv0()->InvMass2Prongs(0,1,11,11) < cutsLctoV0[14]) { // K0S invariant mass veto
340 AliDebug(4,Form(" veto on gamma invariant mass doesn't pass the cut"));
345 if (Getv0()->Pt() < cutsLctoV0[15]) { // V0 pT min
346 AliDebug(4,Form(" V0 track Pt=%2.2e > %2.2e",Getv0()->Pt(),cutsLctoV0[15]));
353 //-----------------------------------------------------------------------------
354 Double_t AliAODRecoCascadeHF::AngleD0dkpPisoft() const {
356 // Angle of soft pion to D0 decay plane
359 TVector3 p3Trk0(Get2Prong()->PxProng(0),Get2Prong()->PyProng(0),Get2Prong()->PzProng(0)); // from D0
360 TVector3 p3Trk1(Get2Prong()->PxProng(1),Get2Prong()->PyProng(1),Get2Prong()->PzProng(1)); // from D0
361 TVector3 p3Trk2(PxProng(0),PyProng(0),PzProng(0)); // pi_s
363 TVector3 perp = p3Trk0.Cross(p3Trk1);
364 Double_t theta = p3Trk2.Angle(perp);
365 if(theta>(TMath::Pi()-theta)) theta = TMath::Pi() - theta;
366 theta = TMath::Pi()/2. - theta;
370 //-----------------------------------------------------------------------------
371 Bool_t AliAODRecoCascadeHF::TrigonometricalCut() const {
373 // Trigonometrical constraint
375 TVector3 p3Trk0(Get2Prong()->PxProng(0),Get2Prong()->PyProng(0),Get2Prong()->PzProng(0)); // from D0
376 TVector3 p3Trk1(Get2Prong()->PxProng(1),Get2Prong()->PyProng(1),Get2Prong()->PzProng(1)); // from D0
377 TVector3 p3Trk2(PxProng(0),PyProng(0),PzProng(0)); // pi_s
379 Double_t alpha = p3Trk0.Angle(p3Trk2);
380 Double_t beta = p3Trk1.Angle(p3Trk2);
382 Double_t cosphi01 = TMath::Cos(alpha) / TMath::Cos(AngleD0dkpPisoft());
383 Double_t cosphi02 = TMath::Cos(beta) / TMath::Cos(AngleD0dkpPisoft());
385 Double_t phi01 = TMath::ACos(cosphi01);
386 Double_t phi02 = TMath::ACos(cosphi02);
387 Double_t phi00 = p3Trk0.Angle(p3Trk1);
389 if((phi01>phi00) || (phi02>phi00)) return kFALSE;
393 //-----------------------------------------------------------------------------
394 Double_t AliAODRecoCascadeHF::DecayLengthV0() const
397 // Returns V0 decay length wrt primary vertex
400 AliAODv0 *v0 = (AliAODv0*)Getv0();
404 AliAODVertex *vtxPrimary = GetPrimaryVtx();
405 Double_t posVtx[3] = {0.,0.,0.};
406 vtxPrimary->GetXYZ(posVtx);
407 return v0->DecayLengthV0(posVtx);
410 //-----------------------------------------------------------------------------
411 Double_t AliAODRecoCascadeHF::DecayLengthXYV0() const
414 // Returns transverse V0 decay length wrt primary vertex
416 AliAODv0 *v0 = (AliAODv0*)Getv0();
420 AliAODVertex *vtxPrimary = GetPrimaryVtx();
421 Double_t posVtx[3] = {0.,0.,0.};
422 vtxPrimary->GetXYZ(posVtx);
423 return v0->DecayLengthXY(posVtx);
426 //-----------------------------------------------------------------------------
427 Double_t AliAODRecoCascadeHF::CosV0PointingAngle() const
430 // Returns cosine of V0 pointing angle wrt primary vertex
433 AliAODv0 *v0 = (AliAODv0*)Getv0();
438 AliAODVertex *vtxPrimary = GetPrimaryVtx();
439 Double_t posVtx[3] = {0.,0.,0.};
440 vtxPrimary->GetXYZ(posVtx);
441 return v0->CosPointingAngle(posVtx);
444 //-----------------------------------------------------------------------------
445 Double_t AliAODRecoCascadeHF::CosV0PointingAngleXY() const
448 // Returns XY cosine of V0 pointing angle wrt primary vertex
451 AliAODv0 *v0 = (AliAODv0*)Getv0();
456 AliAODVertex *vtxPrimary = GetPrimaryVtx();
457 Double_t posVtx[3] = {0.,0.,0.};
458 vtxPrimary->GetXYZ(posVtx);
459 return v0->CosPointingAngleXY(posVtx);
462 //-----------------------------------------------------------------------------
463 Double_t AliAODRecoCascadeHF::NormalizedV0DecayLength() const
466 // Returns V0 normalized decay length wrt primary vertex
469 AliAODv0 *v0 = (AliAODv0*)Getv0();
473 //AliAODVertex *vtxPrimary = GetPrimaryVtx();
474 //Double_t posVtx[3] = {0.,0.,0.};
475 //vtxPrimary->GetXYZ(posVtx);
476 //return v0->NormalizedDecayLength(posVtx);
477 return v0->NormalizedDecayLength(GetPrimaryVtx());
480 //-----------------------------------------------------------------------------
481 Double_t AliAODRecoCascadeHF::NormalizedV0DecayLengthXY() const
484 // Returns transverse V0 normalized decay length wrt primary vertex
486 AliAODv0 *v0 = (AliAODv0*)Getv0();
490 //AliAODVertex *vtxPrimary = GetPrimaryVtx();
491 //Double_t posVtx[3] = {0.,0.,0.};
492 //vtxPrimary->GetXYZ(posVtx);
493 //return v0->NormalizedDecayLengthXY(posVtx);
494 return v0->NormalizedDecayLengthXY(GetPrimaryVtx());