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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 | ||
33 | ClassImp(AliAODRecoDecay) | |
34 | ||
35 | //-------------------------------------------------------------------------- | |
36 | AliAODRecoDecay::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 | //-------------------------------------------------------------------------- | |
53 | AliAODRecoDecay::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 | //-------------------------------------------------------------------------- | |
84 | AliAODRecoDecay::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 | //-------------------------------------------------------------------------- | |
106 | AliAODRecoDecay::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 | //-------------------------------------------------------------------------- | |
143 | AliAODRecoDecay &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 | //-------------------------------------------------------------------------- | |
186 | AliAODRecoDecay::~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 | //---------------------------------------------------------------------------- | |
199 | Double_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 | //---------------------------------------------------------------------------- | |
211 | Double_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 | //---------------------------------------------------------------------------- | |
224 | Double_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 | //---------------------------------------------------------------------------- | |
235 | Double_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 | //---------------------------------------------------------------------------- | |
250 | Double_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 | //---------------------------------------------------------------------------- | |
266 | Double_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 | //--------------------------------------------------------------------------- | |
293 | Double_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 | //--------------------------------------------------------------------------- | |
302 | Double_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 | //--------------------------------------------------------------------------- | |
311 | Double_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 | //-------------------------------------------------------------------------- |
320 | Bool_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 | 380 | UChar_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 | //-------------------------------------------------------------------------- | |
404 | ULong_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 | 426 | Bool_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 | 447 | Double_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 | //---------------------------------------------------------------------------- | |
466 | Double_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 | //---------------------------------------------------------------------------- | |
486 | Double_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 | 501 | Int_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 | |
7ba6f91a | 525 | Int_t dgLabels[10] = {0}; |
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 | //---------------------------------------------------------------------------- | |
536 | Int_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 | //--------------------------------------------------------------------------- |
646 | void 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 | //---------------------------------------------------------------------------- | |
657 | Double_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 | //---------------------------------------------------------------------------- | |
670 | Double_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 | //---------------------------------------------------------------------------- | |
681 | Double_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 | //---------------------------------------------------------------------------- | |
692 | Double_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 | //---------------------------------------------------------------------------- | |
706 | Double_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 | //-------------------------------------------------------------------------- |