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adding separate primary vertex and V0 finder components (Timur)
[u/mrichter/AliRoot.git] / STEER / AliAODRecoDecay.cxx
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7de7497b 1/**************************************************************************
2 * Copyright(c) 1998-2006, 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// Base class for AOD reconstructed decay
19//
20// Author: A.Dainese, andrea.dainese@lnl.infn.it
21/////////////////////////////////////////////////////////////
22
23#include <TDatabasePDG.h>
24#include <TVector3.h>
bfd68286 25#include <TClonesArray.h>
e045ffda 26#include "AliLog.h"
27#include "AliVTrack.h"
6dc40b1c 28#include "AliExternalTrackParam.h"
29#include "AliNeutralTrackParam.h"
bfd68286 30#include "AliAODMCParticle.h"
7de7497b 31#include "AliAODRecoDecay.h"
32
33ClassImp(AliAODRecoDecay)
34
35//--------------------------------------------------------------------------
36AliAODRecoDecay::AliAODRecoDecay() :
e045ffda 37 AliVTrack(),
7de7497b 38 fSecondaryVtx(0x0),
a11de4a0 39 fOwnSecondaryVtx(0x0),
7de7497b 40 fCharge(0),
41 fNProngs(0), fNDCA(0), fNPID(0),
42 fPx(0x0), fPy(0x0), fPz(0x0),
43 fd0(0x0),
44 fDCA(0x0),
45 fPID(0x0),
46 fEventNumber(-1),fRunNumber(-1)
47{
48 //
49 // Default Constructor
50 //
7de7497b 51}
52//--------------------------------------------------------------------------
53AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
54 Short_t charge,
55 Double_t *px,Double_t *py,Double_t *pz,
56 Double_t *d0) :
e045ffda 57 AliVTrack(),
7de7497b 58 fSecondaryVtx(vtx2),
a11de4a0 59 fOwnSecondaryVtx(0x0),
7de7497b 60 fCharge(charge),
61 fNProngs(nprongs), fNDCA(0), fNPID(0),
62 fPx(0x0), fPy(0x0), fPz(0x0),
63 fd0(0x0),
64 fDCA(0x0),
65 fPID(0x0),
66 fEventNumber(-1),fRunNumber(-1)
67{
68 //
69 // Constructor with AliAODVertex for decay vertex
70 //
71
72 fPx = new Double_t[GetNProngs()];
73 fPy = new Double_t[GetNProngs()];
74 fPz = new Double_t[GetNProngs()];
75 fd0 = new Double_t[GetNProngs()];
76 for(Int_t i=0; i<GetNProngs(); i++) {
77 fPx[i] = px[i];
78 fPy[i] = py[i];
79 fPz[i] = pz[i];
80 fd0[i] = d0[i];
81 }
82}
83//--------------------------------------------------------------------------
84AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
85 Short_t charge,
86 Double_t *d0) :
e045ffda 87 AliVTrack(),
7de7497b 88 fSecondaryVtx(vtx2),
a11de4a0 89 fOwnSecondaryVtx(0x0),
7de7497b 90 fCharge(charge),
91 fNProngs(nprongs), fNDCA(0), fNPID(0),
92 fPx(0x0), fPy(0x0), fPz(0x0),
93 fd0(0x0),
94 fDCA(0x0),
95 fPID(0x0),
96 fEventNumber(-1),fRunNumber(-1)
97{
98 //
99 // Constructor with AliAODVertex for decay vertex and without prongs momenta
100 //
101
102 fd0 = new Double_t[GetNProngs()];
103 for(Int_t i=0; i<GetNProngs(); i++) fd0[i] = d0[i];
104}
105//--------------------------------------------------------------------------
106AliAODRecoDecay::AliAODRecoDecay(const AliAODRecoDecay &source) :
e045ffda 107 AliVTrack(source),
7de7497b 108 fSecondaryVtx(source.fSecondaryVtx),
a11de4a0 109 fOwnSecondaryVtx(source.fOwnSecondaryVtx),
7de7497b 110 fCharge(source.fCharge),
111 fNProngs(source.fNProngs), fNDCA(source.fNDCA), fNPID(source.fNPID),
112 fPx(0x0), fPy(0x0), fPz(0x0),
113 fd0(0x0),
114 fDCA(0x0),
115 fPID(0x0),
116 fEventNumber(source.fEventNumber),fRunNumber(source.fRunNumber)
117{
118 //
119 // Copy constructor
120 //
121 if(source.GetNProngs()>0) {
58b0186f 122 fd0 = new Double32_t[GetNProngs()];
123 memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double32_t));
7de7497b 124 if(source.fPx) {
58b0186f 125 fPx = new Double32_t[GetNProngs()];
126 fPy = new Double32_t[GetNProngs()];
127 fPz = new Double32_t[GetNProngs()];
128 memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double32_t));
129 memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double32_t));
130 memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double32_t));
7de7497b 131 }
132 if(source.fPID) {
58b0186f 133 fPID = new Double32_t[fNPID];
134 memcpy(fPID,source.fPID,fNPID*sizeof(Double32_t));
7de7497b 135 }
136 if(source.fDCA) {
58b0186f 137 fDCA = new Double32_t[fNDCA];
138 memcpy(fDCA,source.fDCA,fNDCA*sizeof(Double32_t));
7de7497b 139 }
140 }
141}
142//--------------------------------------------------------------------------
143AliAODRecoDecay &AliAODRecoDecay::operator=(const AliAODRecoDecay &source)
144{
145 //
146 // assignment operator
147 //
148 if(&source == this) return *this;
149 fSecondaryVtx = source.fSecondaryVtx;
a11de4a0 150 fOwnSecondaryVtx = source.fOwnSecondaryVtx;
7de7497b 151 fCharge = source.fCharge;
152 fNProngs = source.fNProngs;
153 fNDCA = source.fNDCA;
154 fNPID = source.fNPID;
155 fEventNumber = source.fEventNumber;
156 fRunNumber = source.fRunNumber;
157 if(source.GetNProngs()>0) {
341952b8 158 if(fd0)delete [] fd0;
58b0186f 159 fd0 = new Double32_t[GetNProngs()];
160 memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double32_t));
7de7497b 161 if(source.fPx) {
341952b8 162 if(fPx) delete [] fPx;
58b0186f 163 fPx = new Double32_t[GetNProngs()];
341952b8 164 if(fPy) delete [] fPy;
58b0186f 165 fPy = new Double32_t[GetNProngs()];
341952b8 166 if(fPz) delete [] fPz;
58b0186f 167 fPz = new Double32_t[GetNProngs()];
168 memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double32_t));
169 memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double32_t));
170 memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double32_t));
7de7497b 171 }
172 if(source.fPID) {
341952b8 173 if(fPID) delete [] fPID;
58b0186f 174 fPID = new Double32_t[fNPID];
175 memcpy(fPID,source.fPID,fNPID*sizeof(Double32_t));
7de7497b 176 }
177 if(source.fDCA) {
341952b8 178 if(fDCA) delete [] fDCA;
58b0186f 179 fDCA = new Double32_t[fNDCA];
180 memcpy(fDCA,source.fDCA,fNDCA*sizeof(Double32_t));
7de7497b 181 }
182 }
183 return *this;
184}
185//--------------------------------------------------------------------------
186AliAODRecoDecay::~AliAODRecoDecay() {
187 //
188 // Default Destructor
189 //
a11de4a0 190 if(fPx) { delete [] fPx; fPx=NULL; }
191 if(fPy) { delete [] fPy; fPy=NULL; }
192 if(fPz) { delete [] fPz; fPz=NULL; }
193 if(fd0) { delete [] fd0; fd0=NULL; }
194 if(fPID) { delete [] fPID; fPID=NULL; }
195 if(fDCA) { delete [] fDCA; fDCA=NULL; }
196 if(fOwnSecondaryVtx) { delete fOwnSecondaryVtx; fOwnSecondaryVtx=NULL; }
7de7497b 197}
198//----------------------------------------------------------------------------
199Double_t AliAODRecoDecay::Alpha() const
200{
201 //
202 // Armenteros-Podolanski alpha for 2-prong decays
203 //
204 if(GetNProngs()!=2) {
205 printf("Can be called only for 2-prong decays");
206 return (Double_t)-99999.;
207 }
208 return 1.-2./(1.+QlProng(0)/QlProng(1));
209}
210//----------------------------------------------------------------------------
211Double_t AliAODRecoDecay::DecayLength(Double_t point[3]) const
212{
213 //
214 // Decay length assuming it is produced at "point" [cm]
215 //
216 return TMath::Sqrt((point[0]-GetSecVtxX())
217 *(point[0]-GetSecVtxX())
218 +(point[1]-GetSecVtxY())
219 *(point[1]-GetSecVtxY())
220 +(point[2]-GetSecVtxZ())
221 *(point[2]-GetSecVtxZ()));
222}
223//----------------------------------------------------------------------------
224Double_t AliAODRecoDecay::DecayLengthXY(Double_t point[3]) const
225{
226 //
227 // Decay length in XY assuming it is produced at "point" [cm]
228 //
229 return TMath::Sqrt((point[0]-GetSecVtxX())
230 *(point[0]-GetSecVtxX())
231 +(point[1]-GetSecVtxY())
232 *(point[1]-GetSecVtxY()));
233}
234//----------------------------------------------------------------------------
235Double_t AliAODRecoDecay::CosPointingAngle(Double_t point[3]) const
236{
237 //
238 // Cosine of pointing angle in space assuming it is produced at "point"
239 //
240 TVector3 mom(Px(),Py(),Pz());
241 TVector3 fline(GetSecVtxX()-point[0],
242 GetSecVtxY()-point[1],
243 GetSecVtxZ()-point[2]);
244
245 Double_t pta = mom.Angle(fline);
246
247 return TMath::Cos(pta);
248}
249//----------------------------------------------------------------------------
250Double_t AliAODRecoDecay::CosPointingAngleXY(Double_t point[3]) const
251{
252 //
253 // Cosine of pointing angle in transverse plane assuming it is produced
254 // at "point"
255 //
256 TVector3 momXY(Px(),Py(),0.);
257 TVector3 flineXY(GetSecVtxX()-point[0],
258 GetSecVtxY()-point[1],
259 0.);
260
261 Double_t ptaXY = momXY.Angle(flineXY);
262
263 return TMath::Cos(ptaXY);
264}
265//----------------------------------------------------------------------------
266Double_t AliAODRecoDecay::CosThetaStar(Int_t ip,UInt_t pdgvtx,UInt_t pdgprong0,UInt_t pdgprong1) const
267{
268 //
269 // Only for 2-prong decays:
270 // Cosine of decay angle (theta*) in the rest frame of the mother particle
271 // for prong ip (0 or 1) with mass hypotheses pdgvtx for mother particle,
272 // pdgprong0 for prong 0 and pdgprong1 for prong1
273 //
274 if(GetNProngs()!=2) {
275 printf("Can be called only for 2-prong decays");
276 return (Double_t)-99999.;
277 }
278 Double_t massvtx = TDatabasePDG::Instance()->GetParticle(pdgvtx)->Mass();
279 Double_t massp[2];
280 massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
281 massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();
282
283 Double_t pStar = TMath::Sqrt(TMath::Power(massvtx*massvtx-massp[0]*massp[0]-massp[1]*massp[1],2.)-4.*massp[0]*massp[0]*massp[1]*massp[1])/(2.*massvtx);
284
285 Double_t beta = P()/E(pdgvtx);
286 Double_t gamma = E(pdgvtx)/massvtx;
287
288 Double_t cts = (QlProng(ip)/gamma-beta*TMath::Sqrt(pStar*pStar+massp[ip]*massp[ip]))/pStar;
289
290 return cts;
291}
292//---------------------------------------------------------------------------
293Double_t AliAODRecoDecay::Ct(UInt_t pdg,Double_t point[3]) const
294{
295 //
296 // Decay time * c assuming it is produced at "point" [cm]
297 //
298 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
299 return DecayLength(point)*mass/P();
300}
301//---------------------------------------------------------------------------
302Double_t AliAODRecoDecay::E(UInt_t pdg) const
303{
304 //
305 // Energy
306 //
307 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
308 return TMath::Sqrt(mass*mass+P()*P());
309}
310//---------------------------------------------------------------------------
311Double_t AliAODRecoDecay::EProng(Int_t ip,UInt_t pdg) const
312{
313 //
314 // Energy of ip-th prong
315 //
316 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
317 return TMath::Sqrt(mass*mass+PProng(ip)*PProng(ip));
318}
e045ffda 319//--------------------------------------------------------------------------
320Bool_t AliAODRecoDecay::GetCovarianceXYZPxPyPz(Double_t cv[21]) const {
321 //
322 // This function returns the global covariance matrix of the track params
323 //
324 // Cov(x,x) ... : cv[0]
325 // Cov(y,x) ... : cv[1] cv[2]
326 // Cov(z,x) ... : cv[3] cv[4] cv[5]
327 // Cov(px,x)... : cv[6] cv[7] cv[8] cv[9]
328 // Cov(py,x)... : cv[10] cv[11] cv[12] cv[13] cv[14]
329 // Cov(pz,x)... : cv[15] cv[16] cv[17] cv[18] cv[19] cv[20]
7de7497b 330 //
e045ffda 331 // For XYZ we take the cov of the vertex, for PxPyPz we take the
332 // sum of the covs of PxPyPz from the daughters, for the moment
333 // we set the cov between position and momentum as the sum of
334 // the same cov from the daughters.
7de7497b 335 //
e045ffda 336
337 Int_t j;
338 for(j=0;j<21;j++) cv[j]=0.;
339
340 if(!GetNDaughters()) {
341 AliError("No daughters available");
342 return kFALSE;
343 }
344
345 Double_t v[6];
346 AliAODVertex *secv=GetSecondaryVtx();
347 if(!secv) {
348 AliError("Vertex covariance matrix not available");
349 return kFALSE;
350 }
351 if(!secv->GetCovMatrix(v)) {
352 AliError("Vertex covariance matrix not available");
353 return kFALSE;
354 }
355
356 Double_t p[21]; for(j=0;j<21;j++) p[j]=0.;
357 Bool_t error=kFALSE;
358 for(Int_t i=1; i<GetNDaughters(); i++) {
359 AliVTrack *daugh = (AliVTrack*)GetDaughter(i);
360 Double_t dcov[21];
361 if(!daugh->GetCovarianceXYZPxPyPz(dcov)) error=kTRUE;
362 for(j=0;j<21;j++) p[j] += dcov[j];
363 }
364 if(error) {
365 AliError("No covariance for at least one daughter")
366 return kFALSE;
367 }
368
369 for(j=0; j<21; j++) {
370 if(j<6) {
371 cv[j] = v[j];
372 } else {
373 cv[j] = p[j];
374 }
375 }
376
377 return kTRUE;
378}
7de7497b 379//----------------------------------------------------------------------------
e045ffda 380UChar_t AliAODRecoDecay::GetITSClusterMap() const {
381 //
382 // We take the logical AND of the daughters cluster maps
383 // (only if all daughters have the bit for given layer, we set the bit)
384 //
385 UChar_t map=0;
386
387 if(!GetNDaughters()) {
388 AliError("No daughters available");
389 return map;
390 }
391
392 for(Int_t l=0; l<12; l++) { // loop on ITS layers (from here we cannot know how many they are; let's put 12 to be conservative)
393 Int_t bit = 1;
394 for(Int_t i=0; i<GetNDaughters(); i++) {
395 AliVTrack *daugh = (AliVTrack*)GetDaughter(i);
396 if(!TESTBIT(daugh->GetITSClusterMap(),l)) bit=0;
397 }
398 if(bit) SETBIT(map,l);
399 }
400
401 return map;
402}
403//--------------------------------------------------------------------------
404ULong_t AliAODRecoDecay::GetStatus() const {
405 //
406 // Same as for ITSClusterMap
407 //
408 ULong_t status=0;
409
410 if(!GetNDaughters()) {
411 AliError("No daughters available");
412 return status;
413 }
414
415 AliVTrack *daugh0 = (AliVTrack*)GetDaughter(0);
416 status = status&(daugh0->GetStatus());
417
418 for(Int_t i=1; i<GetNDaughters(); i++) {
419 AliVTrack *daugh = (AliVTrack*)GetDaughter(i);
420 status = status&(daugh->GetStatus());
421 }
422
423 return status;
424}
425//--------------------------------------------------------------------------
6dc40b1c 426Bool_t AliAODRecoDecay::PropagateToDCA(const AliVVertex* vtx,Double_t b,Double_t maxd,Double_t dz[2],Double_t covar[3])
427{
428 // compute impact parameters to the vertex vtx and their covariance matrix
429 // b is the Bz, needed to propagate correctly the track to vertex
430 // return kFALSE is something went wrong
431
432 AliWarning("The AliAODRecoDecay momentum is not updated to the DCA");
433
434 Bool_t retval=kTRUE;
435 if(Charge()==0) {
436 // convert to AliNeutralTrackParam
437 AliNeutralTrackParam ntp(this);
438 retval = ntp.PropagateToDCA(vtx,b,maxd,dz,covar);
439 } else {
440 // convert to AliExternalTrackParam
441 AliExternalTrackParam etp(this);
442 retval = etp.PropagateToDCA(vtx,b,maxd,dz,covar);
443 }
444 return retval;
445}
446//--------------------------------------------------------------------------
7de7497b 447Double_t AliAODRecoDecay::ImpParXY(Double_t point[3]) const
448{
449 //
450 // Impact parameter in the bending plane of the particle
451 // w.r.t. to "point"
452 //
453 Double_t k = -(GetSecVtxX()-point[0])*Px()-(GetSecVtxY()-point[1])*Py();
454 k /= Pt()*Pt();
455 Double_t dx = GetSecVtxX()-point[0]+k*Px();
456 Double_t dy = GetSecVtxY()-point[1]+k*Py();
457 Double_t absImpPar = TMath::Sqrt(dx*dx+dy*dy);
458 TVector3 mom(Px(),Py(),Pz());
459 TVector3 fline(GetSecVtxX()-point[0],
460 GetSecVtxY()-point[1],
461 GetSecVtxZ()-point[2]);
462 TVector3 cross = mom.Cross(fline);
463 return (cross.Z()>0. ? absImpPar : -absImpPar);
464}
465//----------------------------------------------------------------------------
466Double_t AliAODRecoDecay::InvMass(Int_t npdg,UInt_t *pdg) const
467{
468 //
469 // Invariant mass for prongs mass hypotheses in pdg array
470 //
471 if(GetNProngs()!=npdg) {
472 printf("npdg != GetNProngs()");
473 return (Double_t)-99999.;
474 }
475 Double_t energysum = 0.;
476
477 for(Int_t i=0; i<GetNProngs(); i++) {
478 energysum += EProng(i,pdg[i]);
479 }
480
481 Double_t mass = TMath::Sqrt(energysum*energysum-P()*P());
482
483 return mass;
484}
485//----------------------------------------------------------------------------
486Double_t AliAODRecoDecay::InvMass2Prongs(Int_t ip1,Int_t ip2,
487 UInt_t pdg1,UInt_t pdg2) const
488{
489 //
490 // 2-prong(ip1,ip2) invariant mass for prongs mass hypotheses in pdg1,2
491 //
492 Double_t energysum = EProng(ip1,pdg1) + EProng(ip2,pdg2);
493 Double_t psum2 = (PxProng(ip1)+PxProng(ip2))*(PxProng(ip1)+PxProng(ip2))
494 +(PyProng(ip1)+PyProng(ip2))*(PyProng(ip1)+PyProng(ip2))
495 +(PzProng(ip1)+PzProng(ip2))*(PzProng(ip1)+PzProng(ip2));
496 Double_t mass = TMath::Sqrt(energysum*energysum-psum2);
497
498 return mass;
499}
bfd68286 500//----------------------------------------------------------------------------
9c4d0454 501Int_t AliAODRecoDecay::MatchToMC(Int_t pdgabs,TClonesArray *mcArray,
502 Int_t ndgCk,Int_t *pdgDg) const
bfd68286 503{
504 //
505 // Check if this candidate is matched to a MC signal
506 // If no, return -1
507 // If yes, return label (>=0) of the AliAODMCParticle
508 //
9c4d0454 509 // if ndgCk>0, checks also daughters PDGs
510 //
8862e6bf 511 Int_t ndg=GetNDaughters();
512 if(!ndg) {
bfd68286 513 AliError("No daughters available");
514 return -1;
515 }
8862e6bf 516 if(ndg>10) {
517 AliError("Only decays with <10 daughters supported");
518 return -1;
519 }
9c4d0454 520 if(ndgCk>0 && ndgCk!=ndg) {
521 AliError("Wrong number of daughter PDGs passed");
522 return -1;
523 }
bfd68286 524
8862e6bf 525 Int_t dgLabels[10];
bfd68286 526
527 // loop on daughters and write the labels
8862e6bf 528 for(Int_t i=0; i<ndg; i++) {
529 AliAODTrack *trk = (AliAODTrack*)GetDaughter(i);
bfd68286 530 dgLabels[i] = trk->GetLabel();
531 }
532
9c4d0454 533 return MatchToMC(pdgabs,mcArray,dgLabels,ndg,ndgCk,pdgDg);
bfd68286 534}
535//----------------------------------------------------------------------------
536Int_t AliAODRecoDecay::MatchToMC(Int_t pdgabs,TClonesArray *mcArray,
9c4d0454 537 Int_t dgLabels[10],Int_t ndg,
538 Int_t ndgCk,Int_t *pdgDg) const
bfd68286 539{
540 //
541 // Check if this candidate is matched to a MC signal
542 // If no, return -1
543 // If yes, return label (>=0) of the AliAODMCParticle
544 //
545
0f0c06de 546 Int_t labMom[10]={0,0,0,0,0,0,0,0,0,0};
9c4d0454 547 Int_t i,j,lab,labMother,pdgMother,pdgPart;
bfd68286 548 AliAODMCParticle *part=0;
8862e6bf 549 AliAODMCParticle *mother=0;
54ea2d63 550 Double_t pxSumDgs=0.,pySumDgs=0.,pzSumDgs=0.;
9c4d0454 551 Bool_t pdgUsed[10]={kFALSE,kFALSE,kFALSE,kFALSE,kFALSE,kFALSE,kFALSE,kFALSE,kFALSE,kFALSE};
bfd68286 552
553 // loop on daughter labels
8862e6bf 554 for(i=0; i<ndg; i++) {
bfd68286 555 labMom[i]=-1;
556 lab = dgLabels[i];
557 if(lab<0) {
8862e6bf 558 printf("daughter with negative label %d\n",lab);
559 return -1;
bfd68286 560 }
561 part = (AliAODMCParticle*)mcArray->At(lab);
562 if(!part) {
563 printf("no MC particle\n");
8862e6bf 564 return -1;
bfd68286 565 }
8862e6bf 566
9c4d0454 567 // check the PDG of the daughter, if requested
568 if(ndgCk>0) {
569 pdgPart=TMath::Abs(part->GetPdgCode());
570 for(j=0; j<ndg; j++) {
571 if(!pdgUsed[j] && pdgPart==pdgDg[j]) {
572 pdgUsed[j]=kTRUE;
573 break;
574 }
575 }
576 }
577
54ea2d63 578 // for the J/psi, check that the daughters are electrons
8862e6bf 579 if(pdgabs==443) {
580 if(TMath::Abs(part->GetPdgCode())!=11) return -1;
581 }
54ea2d63 582
8862e6bf 583 mother = part;
584 while(mother->GetMother()>=0) {
585 labMother=mother->GetMother();
586 mother = (AliAODMCParticle*)mcArray->At(labMother);
587 if(!mother) {
bfd68286 588 printf("no MC mother particle\n");
589 break;
590 }
8862e6bf 591 pdgMother = TMath::Abs(mother->GetPdgCode());
bfd68286 592 if(pdgMother==pdgabs) {
593 labMom[i]=labMother;
8862e6bf 594 // keep sum of daughters' momenta, to check for mom conservation
595 pxSumDgs += part->Px();
596 pySumDgs += part->Py();
597 pzSumDgs += part->Pz();
598 break;
599 } else if(pdgMother>pdgabs || pdgMother<10) {
bfd68286 600 break;
601 }
602 }
8862e6bf 603 if(labMom[i]==-1) return -1; // mother PDG not ok for this daughter
604 } // end loop on daughters
bfd68286 605
606 // check if the candidate is signal
bfd68286 607 labMother=labMom[0];
608 // all labels have to be the same and !=-1
8862e6bf 609 for(i=0; i<ndg; i++) {
610 if(labMom[i]==-1) return -1;
611 if(labMom[i]!=labMother) return -1;
bfd68286 612 }
613
9c4d0454 614 // check that all daughter PDGs are matched
615 if(ndgCk>0) {
616 for(i=0; i<ndg; i++) {
617 if(pdgUsed[i]==kFALSE) return -1;
618 }
619 }
8862e6bf 620
621 /*
bfd68286 622 // check that the mother decayed in <GetNDaughters()> prongs
8862e6bf 623 Int_t ndg2 = TMath::Abs(mother->GetDaughter(1)-mother->GetDaughter(0))+1;
624 printf(" MC daughters %d\n",ndg2);
625 //if(ndg!=GetNDaughters()) return -1;
626 AliAODMCParticle* p1=(AliAODMCParticle*)(mcArray->At(mother->GetDaughter(1)));
627 AliAODMCParticle* p0=(AliAODMCParticle*)(mcArray->At(mother->GetDaughter(0)));
628 printf(">>>>>>>> pdg %d %d %d %d %d %d\n",mother->GetDaughter(0),mother->GetDaughter(1),dgLabels[0],dgLabels[1],p0->GetPdgCode(),p1->GetPdgCode());
54ea2d63 629 */
bfd68286 630
54ea2d63 631 // the above works only for non-resonant decays,
632 // it's better to check for mom conservation
8862e6bf 633 mother = (AliAODMCParticle*)mcArray->At(labMother);
634 Double_t pxMother = mother->Px();
635 Double_t pyMother = mother->Py();
636 Double_t pzMother = mother->Pz();
a364c44a 637 // within 0.1%
9c4d0454 638 if((TMath::Abs(pxMother-pxSumDgs)/(TMath::Abs(pxMother)+1.e-13)) > 0.00001 &&
639 (TMath::Abs(pyMother-pySumDgs)/(TMath::Abs(pyMother)+1.e-13)) > 0.00001 &&
640 (TMath::Abs(pzMother-pzSumDgs)/(TMath::Abs(pzMother)+1.e-13)) > 0.00001)
a364c44a 641 return -1;
54ea2d63 642
bfd68286 643 return labMother;
644}
7de7497b 645//---------------------------------------------------------------------------
646void AliAODRecoDecay::Print(Option_t* /*option*/) const
647{
648 //
649 // Print some information
650 //
651 printf("AliAODRecoDecay with %d prongs\n",GetNProngs());
652 printf("Secondary Vertex: (%f, %f, %f)\n",GetSecVtxX(),GetSecVtxY(),GetSecVtxZ());
653
654 return;
655}
656//----------------------------------------------------------------------------
657Double_t AliAODRecoDecay::ProngsRelAngle(Int_t ip1,Int_t ip2) const
658{
659 //
660 // Relative angle between two prongs
661 //
662 TVector3 momA(PxProng(ip1),PyProng(ip1),PzProng(ip1));
663 TVector3 momB(PxProng(ip2),PyProng(ip2),PzProng(ip2));
664
665 Double_t angle = momA.Angle(momB);
666
667 return angle;
668}
669//----------------------------------------------------------------------------
670Double_t AliAODRecoDecay::QlProng(Int_t ip) const
671{
672 //
673 // Longitudinal momentum of prong w.r.t. to total momentum
674 //
675 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
676 TVector3 momTot(Px(),Py(),Pz());
677
678 return mom.Dot(momTot)/momTot.Mag();
679}
680//----------------------------------------------------------------------------
681Double_t AliAODRecoDecay::QtProng(Int_t ip) const
682{
683 //
684 // Transverse momentum of prong w.r.t. to total momentum
685 //
686 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
687 TVector3 momTot(Px(),Py(),Pz());
688
689 return mom.Perp(momTot);
690}
691//----------------------------------------------------------------------------
692Double_t AliAODRecoDecay::QlProngFlightLine(Int_t ip,Double_t point[3]) const
693{
694 //
695 // Longitudinal momentum of prong w.r.t. to flight line between "point"
696 // and fSecondaryVtx
697 //
698 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
699 TVector3 fline(GetSecVtxX()-point[0],
700 GetSecVtxY()-point[1],
701 GetSecVtxZ()-point[2]);
702
703 return mom.Dot(fline)/fline.Mag();
704}
705//----------------------------------------------------------------------------
706Double_t AliAODRecoDecay::QtProngFlightLine(Int_t ip,Double_t point[3]) const
707{
708 //
709 // Transverse momentum of prong w.r.t. to flight line between "point" and
710 // fSecondaryVtx
711 //
712 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
713 TVector3 fline(GetSecVtxX()-point[0],
714 GetSecVtxY()-point[1],
715 GetSecVtxZ()-point[2]);
716
717 return mom.Perp(fline);
718}
719//--------------------------------------------------------------------------