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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> | |
e045ffda | 25 | #include "AliLog.h" |
26 | #include "AliVTrack.h" | |
7de7497b | 27 | #include "AliAODRecoDecay.h" |
28 | ||
29 | ClassImp(AliAODRecoDecay) | |
30 | ||
31 | //-------------------------------------------------------------------------- | |
32 | AliAODRecoDecay::AliAODRecoDecay() : | |
e045ffda | 33 | AliVTrack(), |
7de7497b | 34 | fSecondaryVtx(0x0), |
a11de4a0 | 35 | fOwnSecondaryVtx(0x0), |
7de7497b | 36 | fCharge(0), |
37 | fNProngs(0), fNDCA(0), fNPID(0), | |
38 | fPx(0x0), fPy(0x0), fPz(0x0), | |
39 | fd0(0x0), | |
40 | fDCA(0x0), | |
41 | fPID(0x0), | |
42 | fEventNumber(-1),fRunNumber(-1) | |
43 | { | |
44 | // | |
45 | // Default Constructor | |
46 | // | |
7de7497b | 47 | } |
48 | //-------------------------------------------------------------------------- | |
49 | AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs, | |
50 | Short_t charge, | |
51 | Double_t *px,Double_t *py,Double_t *pz, | |
52 | Double_t *d0) : | |
e045ffda | 53 | AliVTrack(), |
7de7497b | 54 | fSecondaryVtx(vtx2), |
a11de4a0 | 55 | fOwnSecondaryVtx(0x0), |
7de7497b | 56 | fCharge(charge), |
57 | fNProngs(nprongs), fNDCA(0), fNPID(0), | |
58 | fPx(0x0), fPy(0x0), fPz(0x0), | |
59 | fd0(0x0), | |
60 | fDCA(0x0), | |
61 | fPID(0x0), | |
62 | fEventNumber(-1),fRunNumber(-1) | |
63 | { | |
64 | // | |
65 | // Constructor with AliAODVertex for decay vertex | |
66 | // | |
67 | ||
68 | fPx = new Double_t[GetNProngs()]; | |
69 | fPy = new Double_t[GetNProngs()]; | |
70 | fPz = new Double_t[GetNProngs()]; | |
71 | fd0 = new Double_t[GetNProngs()]; | |
72 | for(Int_t i=0; i<GetNProngs(); i++) { | |
73 | fPx[i] = px[i]; | |
74 | fPy[i] = py[i]; | |
75 | fPz[i] = pz[i]; | |
76 | fd0[i] = d0[i]; | |
77 | } | |
78 | } | |
79 | //-------------------------------------------------------------------------- | |
80 | AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs, | |
81 | Short_t charge, | |
82 | Double_t *d0) : | |
e045ffda | 83 | AliVTrack(), |
7de7497b | 84 | fSecondaryVtx(vtx2), |
a11de4a0 | 85 | fOwnSecondaryVtx(0x0), |
7de7497b | 86 | fCharge(charge), |
87 | fNProngs(nprongs), fNDCA(0), fNPID(0), | |
88 | fPx(0x0), fPy(0x0), fPz(0x0), | |
89 | fd0(0x0), | |
90 | fDCA(0x0), | |
91 | fPID(0x0), | |
92 | fEventNumber(-1),fRunNumber(-1) | |
93 | { | |
94 | // | |
95 | // Constructor with AliAODVertex for decay vertex and without prongs momenta | |
96 | // | |
97 | ||
98 | fd0 = new Double_t[GetNProngs()]; | |
99 | for(Int_t i=0; i<GetNProngs(); i++) fd0[i] = d0[i]; | |
100 | } | |
101 | //-------------------------------------------------------------------------- | |
102 | AliAODRecoDecay::AliAODRecoDecay(const AliAODRecoDecay &source) : | |
e045ffda | 103 | AliVTrack(source), |
7de7497b | 104 | fSecondaryVtx(source.fSecondaryVtx), |
a11de4a0 | 105 | fOwnSecondaryVtx(source.fOwnSecondaryVtx), |
7de7497b | 106 | fCharge(source.fCharge), |
107 | fNProngs(source.fNProngs), fNDCA(source.fNDCA), fNPID(source.fNPID), | |
108 | fPx(0x0), fPy(0x0), fPz(0x0), | |
109 | fd0(0x0), | |
110 | fDCA(0x0), | |
111 | fPID(0x0), | |
112 | fEventNumber(source.fEventNumber),fRunNumber(source.fRunNumber) | |
113 | { | |
114 | // | |
115 | // Copy constructor | |
116 | // | |
117 | if(source.GetNProngs()>0) { | |
58b0186f | 118 | fd0 = new Double32_t[GetNProngs()]; |
119 | memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double32_t)); | |
7de7497b | 120 | if(source.fPx) { |
58b0186f | 121 | fPx = new Double32_t[GetNProngs()]; |
122 | fPy = new Double32_t[GetNProngs()]; | |
123 | fPz = new Double32_t[GetNProngs()]; | |
124 | memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double32_t)); | |
125 | memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double32_t)); | |
126 | memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double32_t)); | |
7de7497b | 127 | } |
128 | if(source.fPID) { | |
58b0186f | 129 | fPID = new Double32_t[fNPID]; |
130 | memcpy(fPID,source.fPID,fNPID*sizeof(Double32_t)); | |
7de7497b | 131 | } |
132 | if(source.fDCA) { | |
58b0186f | 133 | fDCA = new Double32_t[fNDCA]; |
134 | memcpy(fDCA,source.fDCA,fNDCA*sizeof(Double32_t)); | |
7de7497b | 135 | } |
136 | } | |
137 | } | |
138 | //-------------------------------------------------------------------------- | |
139 | AliAODRecoDecay &AliAODRecoDecay::operator=(const AliAODRecoDecay &source) | |
140 | { | |
141 | // | |
142 | // assignment operator | |
143 | // | |
144 | if(&source == this) return *this; | |
145 | fSecondaryVtx = source.fSecondaryVtx; | |
a11de4a0 | 146 | fOwnSecondaryVtx = source.fOwnSecondaryVtx; |
7de7497b | 147 | fCharge = source.fCharge; |
148 | fNProngs = source.fNProngs; | |
149 | fNDCA = source.fNDCA; | |
150 | fNPID = source.fNPID; | |
151 | fEventNumber = source.fEventNumber; | |
152 | fRunNumber = source.fRunNumber; | |
153 | if(source.GetNProngs()>0) { | |
341952b8 | 154 | if(fd0)delete [] fd0; |
58b0186f | 155 | fd0 = new Double32_t[GetNProngs()]; |
156 | memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double32_t)); | |
7de7497b | 157 | if(source.fPx) { |
341952b8 | 158 | if(fPx) delete [] fPx; |
58b0186f | 159 | fPx = new Double32_t[GetNProngs()]; |
341952b8 | 160 | if(fPy) delete [] fPy; |
58b0186f | 161 | fPy = new Double32_t[GetNProngs()]; |
341952b8 | 162 | if(fPz) delete [] fPz; |
58b0186f | 163 | fPz = new Double32_t[GetNProngs()]; |
164 | memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double32_t)); | |
165 | memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double32_t)); | |
166 | memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double32_t)); | |
7de7497b | 167 | } |
168 | if(source.fPID) { | |
341952b8 | 169 | if(fPID) delete [] fPID; |
58b0186f | 170 | fPID = new Double32_t[fNPID]; |
171 | memcpy(fPID,source.fPID,fNPID*sizeof(Double32_t)); | |
7de7497b | 172 | } |
173 | if(source.fDCA) { | |
341952b8 | 174 | if(fDCA) delete [] fDCA; |
58b0186f | 175 | fDCA = new Double32_t[fNDCA]; |
176 | memcpy(fDCA,source.fDCA,fNDCA*sizeof(Double32_t)); | |
7de7497b | 177 | } |
178 | } | |
179 | return *this; | |
180 | } | |
181 | //-------------------------------------------------------------------------- | |
182 | AliAODRecoDecay::~AliAODRecoDecay() { | |
183 | // | |
184 | // Default Destructor | |
185 | // | |
a11de4a0 | 186 | if(fPx) { delete [] fPx; fPx=NULL; } |
187 | if(fPy) { delete [] fPy; fPy=NULL; } | |
188 | if(fPz) { delete [] fPz; fPz=NULL; } | |
189 | if(fd0) { delete [] fd0; fd0=NULL; } | |
190 | if(fPID) { delete [] fPID; fPID=NULL; } | |
191 | if(fDCA) { delete [] fDCA; fDCA=NULL; } | |
192 | if(fOwnSecondaryVtx) { delete fOwnSecondaryVtx; fOwnSecondaryVtx=NULL; } | |
7de7497b | 193 | } |
194 | //---------------------------------------------------------------------------- | |
195 | Double_t AliAODRecoDecay::Alpha() const | |
196 | { | |
197 | // | |
198 | // Armenteros-Podolanski alpha for 2-prong decays | |
199 | // | |
200 | if(GetNProngs()!=2) { | |
201 | printf("Can be called only for 2-prong decays"); | |
202 | return (Double_t)-99999.; | |
203 | } | |
204 | return 1.-2./(1.+QlProng(0)/QlProng(1)); | |
205 | } | |
206 | //---------------------------------------------------------------------------- | |
207 | Double_t AliAODRecoDecay::DecayLength(Double_t point[3]) const | |
208 | { | |
209 | // | |
210 | // Decay length assuming it is produced at "point" [cm] | |
211 | // | |
212 | return TMath::Sqrt((point[0]-GetSecVtxX()) | |
213 | *(point[0]-GetSecVtxX()) | |
214 | +(point[1]-GetSecVtxY()) | |
215 | *(point[1]-GetSecVtxY()) | |
216 | +(point[2]-GetSecVtxZ()) | |
217 | *(point[2]-GetSecVtxZ())); | |
218 | } | |
219 | //---------------------------------------------------------------------------- | |
220 | Double_t AliAODRecoDecay::DecayLengthXY(Double_t point[3]) const | |
221 | { | |
222 | // | |
223 | // Decay length in XY assuming it is produced at "point" [cm] | |
224 | // | |
225 | return TMath::Sqrt((point[0]-GetSecVtxX()) | |
226 | *(point[0]-GetSecVtxX()) | |
227 | +(point[1]-GetSecVtxY()) | |
228 | *(point[1]-GetSecVtxY())); | |
229 | } | |
230 | //---------------------------------------------------------------------------- | |
231 | Double_t AliAODRecoDecay::CosPointingAngle(Double_t point[3]) const | |
232 | { | |
233 | // | |
234 | // Cosine of pointing angle in space assuming it is produced at "point" | |
235 | // | |
236 | TVector3 mom(Px(),Py(),Pz()); | |
237 | TVector3 fline(GetSecVtxX()-point[0], | |
238 | GetSecVtxY()-point[1], | |
239 | GetSecVtxZ()-point[2]); | |
240 | ||
241 | Double_t pta = mom.Angle(fline); | |
242 | ||
243 | return TMath::Cos(pta); | |
244 | } | |
245 | //---------------------------------------------------------------------------- | |
246 | Double_t AliAODRecoDecay::CosPointingAngleXY(Double_t point[3]) const | |
247 | { | |
248 | // | |
249 | // Cosine of pointing angle in transverse plane assuming it is produced | |
250 | // at "point" | |
251 | // | |
252 | TVector3 momXY(Px(),Py(),0.); | |
253 | TVector3 flineXY(GetSecVtxX()-point[0], | |
254 | GetSecVtxY()-point[1], | |
255 | 0.); | |
256 | ||
257 | Double_t ptaXY = momXY.Angle(flineXY); | |
258 | ||
259 | return TMath::Cos(ptaXY); | |
260 | } | |
261 | //---------------------------------------------------------------------------- | |
262 | Double_t AliAODRecoDecay::CosThetaStar(Int_t ip,UInt_t pdgvtx,UInt_t pdgprong0,UInt_t pdgprong1) const | |
263 | { | |
264 | // | |
265 | // Only for 2-prong decays: | |
266 | // Cosine of decay angle (theta*) in the rest frame of the mother particle | |
267 | // for prong ip (0 or 1) with mass hypotheses pdgvtx for mother particle, | |
268 | // pdgprong0 for prong 0 and pdgprong1 for prong1 | |
269 | // | |
270 | if(GetNProngs()!=2) { | |
271 | printf("Can be called only for 2-prong decays"); | |
272 | return (Double_t)-99999.; | |
273 | } | |
274 | Double_t massvtx = TDatabasePDG::Instance()->GetParticle(pdgvtx)->Mass(); | |
275 | Double_t massp[2]; | |
276 | massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass(); | |
277 | massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass(); | |
278 | ||
279 | 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); | |
280 | ||
281 | Double_t beta = P()/E(pdgvtx); | |
282 | Double_t gamma = E(pdgvtx)/massvtx; | |
283 | ||
284 | Double_t cts = (QlProng(ip)/gamma-beta*TMath::Sqrt(pStar*pStar+massp[ip]*massp[ip]))/pStar; | |
285 | ||
286 | return cts; | |
287 | } | |
288 | //--------------------------------------------------------------------------- | |
289 | Double_t AliAODRecoDecay::Ct(UInt_t pdg,Double_t point[3]) const | |
290 | { | |
291 | // | |
292 | // Decay time * c assuming it is produced at "point" [cm] | |
293 | // | |
294 | Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass(); | |
295 | return DecayLength(point)*mass/P(); | |
296 | } | |
297 | //--------------------------------------------------------------------------- | |
298 | Double_t AliAODRecoDecay::E(UInt_t pdg) const | |
299 | { | |
300 | // | |
301 | // Energy | |
302 | // | |
303 | Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass(); | |
304 | return TMath::Sqrt(mass*mass+P()*P()); | |
305 | } | |
306 | //--------------------------------------------------------------------------- | |
307 | Double_t AliAODRecoDecay::EProng(Int_t ip,UInt_t pdg) const | |
308 | { | |
309 | // | |
310 | // Energy of ip-th prong | |
311 | // | |
312 | Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass(); | |
313 | return TMath::Sqrt(mass*mass+PProng(ip)*PProng(ip)); | |
314 | } | |
e045ffda | 315 | //-------------------------------------------------------------------------- |
316 | Bool_t AliAODRecoDecay::GetCovarianceXYZPxPyPz(Double_t cv[21]) const { | |
317 | // | |
318 | // This function returns the global covariance matrix of the track params | |
319 | // | |
320 | // Cov(x,x) ... : cv[0] | |
321 | // Cov(y,x) ... : cv[1] cv[2] | |
322 | // Cov(z,x) ... : cv[3] cv[4] cv[5] | |
323 | // Cov(px,x)... : cv[6] cv[7] cv[8] cv[9] | |
324 | // Cov(py,x)... : cv[10] cv[11] cv[12] cv[13] cv[14] | |
325 | // Cov(pz,x)... : cv[15] cv[16] cv[17] cv[18] cv[19] cv[20] | |
7de7497b | 326 | // |
e045ffda | 327 | // For XYZ we take the cov of the vertex, for PxPyPz we take the |
328 | // sum of the covs of PxPyPz from the daughters, for the moment | |
329 | // we set the cov between position and momentum as the sum of | |
330 | // the same cov from the daughters. | |
7de7497b | 331 | // |
e045ffda | 332 | |
333 | Int_t j; | |
334 | for(j=0;j<21;j++) cv[j]=0.; | |
335 | ||
336 | if(!GetNDaughters()) { | |
337 | AliError("No daughters available"); | |
338 | return kFALSE; | |
339 | } | |
340 | ||
341 | Double_t v[6]; | |
342 | AliAODVertex *secv=GetSecondaryVtx(); | |
343 | if(!secv) { | |
344 | AliError("Vertex covariance matrix not available"); | |
345 | return kFALSE; | |
346 | } | |
347 | if(!secv->GetCovMatrix(v)) { | |
348 | AliError("Vertex covariance matrix not available"); | |
349 | return kFALSE; | |
350 | } | |
351 | ||
352 | Double_t p[21]; for(j=0;j<21;j++) p[j]=0.; | |
353 | Bool_t error=kFALSE; | |
354 | for(Int_t i=1; i<GetNDaughters(); i++) { | |
355 | AliVTrack *daugh = (AliVTrack*)GetDaughter(i); | |
356 | Double_t dcov[21]; | |
357 | if(!daugh->GetCovarianceXYZPxPyPz(dcov)) error=kTRUE; | |
358 | for(j=0;j<21;j++) p[j] += dcov[j]; | |
359 | } | |
360 | if(error) { | |
361 | AliError("No covariance for at least one daughter") | |
362 | return kFALSE; | |
363 | } | |
364 | ||
365 | for(j=0; j<21; j++) { | |
366 | if(j<6) { | |
367 | cv[j] = v[j]; | |
368 | } else { | |
369 | cv[j] = p[j]; | |
370 | } | |
371 | } | |
372 | ||
373 | return kTRUE; | |
374 | } | |
7de7497b | 375 | //---------------------------------------------------------------------------- |
e045ffda | 376 | UChar_t AliAODRecoDecay::GetITSClusterMap() const { |
377 | // | |
378 | // We take the logical AND of the daughters cluster maps | |
379 | // (only if all daughters have the bit for given layer, we set the bit) | |
380 | // | |
381 | UChar_t map=0; | |
382 | ||
383 | if(!GetNDaughters()) { | |
384 | AliError("No daughters available"); | |
385 | return map; | |
386 | } | |
387 | ||
388 | 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) | |
389 | Int_t bit = 1; | |
390 | for(Int_t i=0; i<GetNDaughters(); i++) { | |
391 | AliVTrack *daugh = (AliVTrack*)GetDaughter(i); | |
392 | if(!TESTBIT(daugh->GetITSClusterMap(),l)) bit=0; | |
393 | } | |
394 | if(bit) SETBIT(map,l); | |
395 | } | |
396 | ||
397 | return map; | |
398 | } | |
399 | //-------------------------------------------------------------------------- | |
400 | ULong_t AliAODRecoDecay::GetStatus() const { | |
401 | // | |
402 | // Same as for ITSClusterMap | |
403 | // | |
404 | ULong_t status=0; | |
405 | ||
406 | if(!GetNDaughters()) { | |
407 | AliError("No daughters available"); | |
408 | return status; | |
409 | } | |
410 | ||
411 | AliVTrack *daugh0 = (AliVTrack*)GetDaughter(0); | |
412 | status = status&(daugh0->GetStatus()); | |
413 | ||
414 | for(Int_t i=1; i<GetNDaughters(); i++) { | |
415 | AliVTrack *daugh = (AliVTrack*)GetDaughter(i); | |
416 | status = status&(daugh->GetStatus()); | |
417 | } | |
418 | ||
419 | return status; | |
420 | } | |
421 | //-------------------------------------------------------------------------- | |
7de7497b | 422 | Double_t AliAODRecoDecay::ImpParXY(Double_t point[3]) const |
423 | { | |
424 | // | |
425 | // Impact parameter in the bending plane of the particle | |
426 | // w.r.t. to "point" | |
427 | // | |
428 | Double_t k = -(GetSecVtxX()-point[0])*Px()-(GetSecVtxY()-point[1])*Py(); | |
429 | k /= Pt()*Pt(); | |
430 | Double_t dx = GetSecVtxX()-point[0]+k*Px(); | |
431 | Double_t dy = GetSecVtxY()-point[1]+k*Py(); | |
432 | Double_t absImpPar = TMath::Sqrt(dx*dx+dy*dy); | |
433 | TVector3 mom(Px(),Py(),Pz()); | |
434 | TVector3 fline(GetSecVtxX()-point[0], | |
435 | GetSecVtxY()-point[1], | |
436 | GetSecVtxZ()-point[2]); | |
437 | TVector3 cross = mom.Cross(fline); | |
438 | return (cross.Z()>0. ? absImpPar : -absImpPar); | |
439 | } | |
440 | //---------------------------------------------------------------------------- | |
441 | Double_t AliAODRecoDecay::InvMass(Int_t npdg,UInt_t *pdg) const | |
442 | { | |
443 | // | |
444 | // Invariant mass for prongs mass hypotheses in pdg array | |
445 | // | |
446 | if(GetNProngs()!=npdg) { | |
447 | printf("npdg != GetNProngs()"); | |
448 | return (Double_t)-99999.; | |
449 | } | |
450 | Double_t energysum = 0.; | |
451 | ||
452 | for(Int_t i=0; i<GetNProngs(); i++) { | |
453 | energysum += EProng(i,pdg[i]); | |
454 | } | |
455 | ||
456 | Double_t mass = TMath::Sqrt(energysum*energysum-P()*P()); | |
457 | ||
458 | return mass; | |
459 | } | |
460 | //---------------------------------------------------------------------------- | |
461 | Double_t AliAODRecoDecay::InvMass2Prongs(Int_t ip1,Int_t ip2, | |
462 | UInt_t pdg1,UInt_t pdg2) const | |
463 | { | |
464 | // | |
465 | // 2-prong(ip1,ip2) invariant mass for prongs mass hypotheses in pdg1,2 | |
466 | // | |
467 | Double_t energysum = EProng(ip1,pdg1) + EProng(ip2,pdg2); | |
468 | Double_t psum2 = (PxProng(ip1)+PxProng(ip2))*(PxProng(ip1)+PxProng(ip2)) | |
469 | +(PyProng(ip1)+PyProng(ip2))*(PyProng(ip1)+PyProng(ip2)) | |
470 | +(PzProng(ip1)+PzProng(ip2))*(PzProng(ip1)+PzProng(ip2)); | |
471 | Double_t mass = TMath::Sqrt(energysum*energysum-psum2); | |
472 | ||
473 | return mass; | |
474 | } | |
475 | //--------------------------------------------------------------------------- | |
476 | void AliAODRecoDecay::Print(Option_t* /*option*/) const | |
477 | { | |
478 | // | |
479 | // Print some information | |
480 | // | |
481 | printf("AliAODRecoDecay with %d prongs\n",GetNProngs()); | |
482 | printf("Secondary Vertex: (%f, %f, %f)\n",GetSecVtxX(),GetSecVtxY(),GetSecVtxZ()); | |
483 | ||
484 | return; | |
485 | } | |
486 | //---------------------------------------------------------------------------- | |
487 | Double_t AliAODRecoDecay::ProngsRelAngle(Int_t ip1,Int_t ip2) const | |
488 | { | |
489 | // | |
490 | // Relative angle between two prongs | |
491 | // | |
492 | TVector3 momA(PxProng(ip1),PyProng(ip1),PzProng(ip1)); | |
493 | TVector3 momB(PxProng(ip2),PyProng(ip2),PzProng(ip2)); | |
494 | ||
495 | Double_t angle = momA.Angle(momB); | |
496 | ||
497 | return angle; | |
498 | } | |
499 | //---------------------------------------------------------------------------- | |
500 | Double_t AliAODRecoDecay::QlProng(Int_t ip) const | |
501 | { | |
502 | // | |
503 | // Longitudinal momentum of prong w.r.t. to total momentum | |
504 | // | |
505 | TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip)); | |
506 | TVector3 momTot(Px(),Py(),Pz()); | |
507 | ||
508 | return mom.Dot(momTot)/momTot.Mag(); | |
509 | } | |
510 | //---------------------------------------------------------------------------- | |
511 | Double_t AliAODRecoDecay::QtProng(Int_t ip) const | |
512 | { | |
513 | // | |
514 | // Transverse momentum of prong w.r.t. to total momentum | |
515 | // | |
516 | TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip)); | |
517 | TVector3 momTot(Px(),Py(),Pz()); | |
518 | ||
519 | return mom.Perp(momTot); | |
520 | } | |
521 | //---------------------------------------------------------------------------- | |
522 | Double_t AliAODRecoDecay::QlProngFlightLine(Int_t ip,Double_t point[3]) const | |
523 | { | |
524 | // | |
525 | // Longitudinal momentum of prong w.r.t. to flight line between "point" | |
526 | // and fSecondaryVtx | |
527 | // | |
528 | TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip)); | |
529 | TVector3 fline(GetSecVtxX()-point[0], | |
530 | GetSecVtxY()-point[1], | |
531 | GetSecVtxZ()-point[2]); | |
532 | ||
533 | return mom.Dot(fline)/fline.Mag(); | |
534 | } | |
535 | //---------------------------------------------------------------------------- | |
536 | Double_t AliAODRecoDecay::QtProngFlightLine(Int_t ip,Double_t point[3]) const | |
537 | { | |
538 | // | |
539 | // Transverse momentum of prong w.r.t. to flight line between "point" and | |
540 | // fSecondaryVtx | |
541 | // | |
542 | TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip)); | |
543 | TVector3 fline(GetSecVtxX()-point[0], | |
544 | GetSecVtxY()-point[1], | |
545 | GetSecVtxZ()-point[2]); | |
546 | ||
547 | return mom.Perp(fline); | |
548 | } | |
549 | //-------------------------------------------------------------------------- |