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[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>
ff7c57dd 25#include "AliVParticle.h"
7de7497b 26#include "AliAODRecoDecay.h"
27
28ClassImp(AliAODRecoDecay)
29
30//--------------------------------------------------------------------------
31AliAODRecoDecay::AliAODRecoDecay() :
ff7c57dd 32 AliVParticle(),
7de7497b 33 fSecondaryVtx(0x0),
a11de4a0 34 fOwnSecondaryVtx(0x0),
7de7497b 35 fCharge(0),
36 fNProngs(0), fNDCA(0), fNPID(0),
37 fPx(0x0), fPy(0x0), fPz(0x0),
38 fd0(0x0),
39 fDCA(0x0),
40 fPID(0x0),
41 fEventNumber(-1),fRunNumber(-1)
42{
43 //
44 // Default Constructor
45 //
7de7497b 46}
47//--------------------------------------------------------------------------
48AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
49 Short_t charge,
50 Double_t *px,Double_t *py,Double_t *pz,
51 Double_t *d0) :
ff7c57dd 52 AliVParticle(),
7de7497b 53 fSecondaryVtx(vtx2),
a11de4a0 54 fOwnSecondaryVtx(0x0),
7de7497b 55 fCharge(charge),
56 fNProngs(nprongs), fNDCA(0), fNPID(0),
57 fPx(0x0), fPy(0x0), fPz(0x0),
58 fd0(0x0),
59 fDCA(0x0),
60 fPID(0x0),
61 fEventNumber(-1),fRunNumber(-1)
62{
63 //
64 // Constructor with AliAODVertex for decay vertex
65 //
66
67 fPx = new Double_t[GetNProngs()];
68 fPy = new Double_t[GetNProngs()];
69 fPz = new Double_t[GetNProngs()];
70 fd0 = new Double_t[GetNProngs()];
71 for(Int_t i=0; i<GetNProngs(); i++) {
72 fPx[i] = px[i];
73 fPy[i] = py[i];
74 fPz[i] = pz[i];
75 fd0[i] = d0[i];
76 }
77}
78//--------------------------------------------------------------------------
79AliAODRecoDecay::AliAODRecoDecay(AliAODVertex *vtx2,Int_t nprongs,
80 Short_t charge,
81 Double_t *d0) :
ff7c57dd 82 AliVParticle(),
7de7497b 83 fSecondaryVtx(vtx2),
a11de4a0 84 fOwnSecondaryVtx(0x0),
7de7497b 85 fCharge(charge),
86 fNProngs(nprongs), fNDCA(0), fNPID(0),
87 fPx(0x0), fPy(0x0), fPz(0x0),
88 fd0(0x0),
89 fDCA(0x0),
90 fPID(0x0),
91 fEventNumber(-1),fRunNumber(-1)
92{
93 //
94 // Constructor with AliAODVertex for decay vertex and without prongs momenta
95 //
96
97 fd0 = new Double_t[GetNProngs()];
98 for(Int_t i=0; i<GetNProngs(); i++) fd0[i] = d0[i];
99}
100//--------------------------------------------------------------------------
101AliAODRecoDecay::AliAODRecoDecay(const AliAODRecoDecay &source) :
ff7c57dd 102 AliVParticle(source),
7de7497b 103 fSecondaryVtx(source.fSecondaryVtx),
a11de4a0 104 fOwnSecondaryVtx(source.fOwnSecondaryVtx),
7de7497b 105 fCharge(source.fCharge),
106 fNProngs(source.fNProngs), fNDCA(source.fNDCA), fNPID(source.fNPID),
107 fPx(0x0), fPy(0x0), fPz(0x0),
108 fd0(0x0),
109 fDCA(0x0),
110 fPID(0x0),
111 fEventNumber(source.fEventNumber),fRunNumber(source.fRunNumber)
112{
113 //
114 // Copy constructor
115 //
116 if(source.GetNProngs()>0) {
117 fd0 = new Double_t[GetNProngs()];
118 memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
119 if(source.fPx) {
120 fPx = new Double_t[GetNProngs()];
121 fPy = new Double_t[GetNProngs()];
122 fPz = new Double_t[GetNProngs()];
123 memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
124 memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
125 memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
126 }
127 if(source.fPID) {
128 fPID = new Double_t[5*GetNProngs()];
129 memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
130 }
131 if(source.fDCA) {
5cc73331 132 fDCA = new Double_t[GetNProngs()*(GetNProngs()-1)/2];
133 memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Double_t));
7de7497b 134 }
135 }
136}
137//--------------------------------------------------------------------------
138AliAODRecoDecay &AliAODRecoDecay::operator=(const AliAODRecoDecay &source)
139{
140 //
141 // assignment operator
142 //
143 if(&source == this) return *this;
144 fSecondaryVtx = source.fSecondaryVtx;
a11de4a0 145 fOwnSecondaryVtx = source.fOwnSecondaryVtx;
7de7497b 146 fCharge = source.fCharge;
147 fNProngs = source.fNProngs;
148 fNDCA = source.fNDCA;
149 fNPID = source.fNPID;
150 fEventNumber = source.fEventNumber;
151 fRunNumber = source.fRunNumber;
152 if(source.GetNProngs()>0) {
153 fd0 = new Double_t[GetNProngs()];
154 memcpy(fd0,source.fd0,GetNProngs()*sizeof(Double_t));
155 if(source.fPx) {
156 fPx = new Double_t[GetNProngs()];
157 fPy = new Double_t[GetNProngs()];
158 fPz = new Double_t[GetNProngs()];
159 memcpy(fPx,source.fPx,GetNProngs()*sizeof(Double_t));
160 memcpy(fPy,source.fPy,GetNProngs()*sizeof(Double_t));
161 memcpy(fPz,source.fPz,GetNProngs()*sizeof(Double_t));
162 }
163 if(source.fPID) {
164 fPID = new Double_t[5*GetNProngs()];
165 memcpy(fPID,source.fPID,GetNProngs()*sizeof(Double_t));
166 }
167 if(source.fDCA) {
5cc73331 168 fDCA = new Double_t[GetNProngs()*(GetNProngs()-1)/2];
169 memcpy(fDCA,source.fDCA,(GetNProngs()*(GetNProngs()-1)/2)*sizeof(Double32_t));
7de7497b 170 }
171 }
172 return *this;
173}
174//--------------------------------------------------------------------------
175AliAODRecoDecay::~AliAODRecoDecay() {
176 //
177 // Default Destructor
178 //
a11de4a0 179 if(fPx) { delete [] fPx; fPx=NULL; }
180 if(fPy) { delete [] fPy; fPy=NULL; }
181 if(fPz) { delete [] fPz; fPz=NULL; }
182 if(fd0) { delete [] fd0; fd0=NULL; }
183 if(fPID) { delete [] fPID; fPID=NULL; }
184 if(fDCA) { delete [] fDCA; fDCA=NULL; }
185 if(fOwnSecondaryVtx) { delete fOwnSecondaryVtx; fOwnSecondaryVtx=NULL; }
7de7497b 186}
187//----------------------------------------------------------------------------
188Double_t AliAODRecoDecay::Alpha() const
189{
190 //
191 // Armenteros-Podolanski alpha for 2-prong decays
192 //
193 if(GetNProngs()!=2) {
194 printf("Can be called only for 2-prong decays");
195 return (Double_t)-99999.;
196 }
197 return 1.-2./(1.+QlProng(0)/QlProng(1));
198}
199//----------------------------------------------------------------------------
200Double_t AliAODRecoDecay::DecayLength(Double_t point[3]) const
201{
202 //
203 // Decay length assuming it is produced at "point" [cm]
204 //
205 return TMath::Sqrt((point[0]-GetSecVtxX())
206 *(point[0]-GetSecVtxX())
207 +(point[1]-GetSecVtxY())
208 *(point[1]-GetSecVtxY())
209 +(point[2]-GetSecVtxZ())
210 *(point[2]-GetSecVtxZ()));
211}
212//----------------------------------------------------------------------------
213Double_t AliAODRecoDecay::DecayLengthXY(Double_t point[3]) const
214{
215 //
216 // Decay length in XY assuming it is produced at "point" [cm]
217 //
218 return TMath::Sqrt((point[0]-GetSecVtxX())
219 *(point[0]-GetSecVtxX())
220 +(point[1]-GetSecVtxY())
221 *(point[1]-GetSecVtxY()));
222}
223//----------------------------------------------------------------------------
224Double_t AliAODRecoDecay::CosPointingAngle(Double_t point[3]) const
225{
226 //
227 // Cosine of pointing angle in space assuming it is produced at "point"
228 //
229 TVector3 mom(Px(),Py(),Pz());
230 TVector3 fline(GetSecVtxX()-point[0],
231 GetSecVtxY()-point[1],
232 GetSecVtxZ()-point[2]);
233
234 Double_t pta = mom.Angle(fline);
235
236 return TMath::Cos(pta);
237}
238//----------------------------------------------------------------------------
239Double_t AliAODRecoDecay::CosPointingAngleXY(Double_t point[3]) const
240{
241 //
242 // Cosine of pointing angle in transverse plane assuming it is produced
243 // at "point"
244 //
245 TVector3 momXY(Px(),Py(),0.);
246 TVector3 flineXY(GetSecVtxX()-point[0],
247 GetSecVtxY()-point[1],
248 0.);
249
250 Double_t ptaXY = momXY.Angle(flineXY);
251
252 return TMath::Cos(ptaXY);
253}
254//----------------------------------------------------------------------------
255Double_t AliAODRecoDecay::CosThetaStar(Int_t ip,UInt_t pdgvtx,UInt_t pdgprong0,UInt_t pdgprong1) const
256{
257 //
258 // Only for 2-prong decays:
259 // Cosine of decay angle (theta*) in the rest frame of the mother particle
260 // for prong ip (0 or 1) with mass hypotheses pdgvtx for mother particle,
261 // pdgprong0 for prong 0 and pdgprong1 for prong1
262 //
263 if(GetNProngs()!=2) {
264 printf("Can be called only for 2-prong decays");
265 return (Double_t)-99999.;
266 }
267 Double_t massvtx = TDatabasePDG::Instance()->GetParticle(pdgvtx)->Mass();
268 Double_t massp[2];
269 massp[0] = TDatabasePDG::Instance()->GetParticle(pdgprong0)->Mass();
270 massp[1] = TDatabasePDG::Instance()->GetParticle(pdgprong1)->Mass();
271
272 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);
273
274 Double_t beta = P()/E(pdgvtx);
275 Double_t gamma = E(pdgvtx)/massvtx;
276
277 Double_t cts = (QlProng(ip)/gamma-beta*TMath::Sqrt(pStar*pStar+massp[ip]*massp[ip]))/pStar;
278
279 return cts;
280}
281//---------------------------------------------------------------------------
282Double_t AliAODRecoDecay::Ct(UInt_t pdg,Double_t point[3]) const
283{
284 //
285 // Decay time * c assuming it is produced at "point" [cm]
286 //
287 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
288 return DecayLength(point)*mass/P();
289}
290//---------------------------------------------------------------------------
291Double_t AliAODRecoDecay::E(UInt_t pdg) const
292{
293 //
294 // Energy
295 //
296 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
297 return TMath::Sqrt(mass*mass+P()*P());
298}
299//---------------------------------------------------------------------------
300Double_t AliAODRecoDecay::EProng(Int_t ip,UInt_t pdg) const
301{
302 //
303 // Energy of ip-th prong
304 //
305 Double_t mass = TDatabasePDG::Instance()->GetParticle(pdg)->Mass();
306 return TMath::Sqrt(mass*mass+PProng(ip)*PProng(ip));
307}
308//---------------------------------------------------------------------------
309/*Int_t AliAODRecoDecay::GetIndexProng(Int_t ip) const
310{
311 //
312 // Index of prong ip
313 //
314 if(!GetNProngs()) return 999999;
5cc73331 315UShort_t *indices = GetSecondaryVtx()->GetIndices();
7de7497b 316 return indices[ip];
317}*/
318//----------------------------------------------------------------------------
319Double_t AliAODRecoDecay::ImpParXY(Double_t point[3]) const
320{
321 //
322 // Impact parameter in the bending plane of the particle
323 // w.r.t. to "point"
324 //
325 Double_t k = -(GetSecVtxX()-point[0])*Px()-(GetSecVtxY()-point[1])*Py();
326 k /= Pt()*Pt();
327 Double_t dx = GetSecVtxX()-point[0]+k*Px();
328 Double_t dy = GetSecVtxY()-point[1]+k*Py();
329 Double_t absImpPar = TMath::Sqrt(dx*dx+dy*dy);
330 TVector3 mom(Px(),Py(),Pz());
331 TVector3 fline(GetSecVtxX()-point[0],
332 GetSecVtxY()-point[1],
333 GetSecVtxZ()-point[2]);
334 TVector3 cross = mom.Cross(fline);
335 return (cross.Z()>0. ? absImpPar : -absImpPar);
336}
337//----------------------------------------------------------------------------
338Double_t AliAODRecoDecay::InvMass(Int_t npdg,UInt_t *pdg) const
339{
340 //
341 // Invariant mass for prongs mass hypotheses in pdg array
342 //
343 if(GetNProngs()!=npdg) {
344 printf("npdg != GetNProngs()");
345 return (Double_t)-99999.;
346 }
347 Double_t energysum = 0.;
348
349 for(Int_t i=0; i<GetNProngs(); i++) {
350 energysum += EProng(i,pdg[i]);
351 }
352
353 Double_t mass = TMath::Sqrt(energysum*energysum-P()*P());
354
355 return mass;
356}
357//----------------------------------------------------------------------------
358Double_t AliAODRecoDecay::InvMass2Prongs(Int_t ip1,Int_t ip2,
359 UInt_t pdg1,UInt_t pdg2) const
360{
361 //
362 // 2-prong(ip1,ip2) invariant mass for prongs mass hypotheses in pdg1,2
363 //
364 Double_t energysum = EProng(ip1,pdg1) + EProng(ip2,pdg2);
365 Double_t psum2 = (PxProng(ip1)+PxProng(ip2))*(PxProng(ip1)+PxProng(ip2))
366 +(PyProng(ip1)+PyProng(ip2))*(PyProng(ip1)+PyProng(ip2))
367 +(PzProng(ip1)+PzProng(ip2))*(PzProng(ip1)+PzProng(ip2));
368 Double_t mass = TMath::Sqrt(energysum*energysum-psum2);
369
370 return mass;
371}
372//---------------------------------------------------------------------------
373void AliAODRecoDecay::Print(Option_t* /*option*/) const
374{
375 //
376 // Print some information
377 //
378 printf("AliAODRecoDecay with %d prongs\n",GetNProngs());
379 printf("Secondary Vertex: (%f, %f, %f)\n",GetSecVtxX(),GetSecVtxY(),GetSecVtxZ());
380
381 return;
382}
383//----------------------------------------------------------------------------
384Double_t AliAODRecoDecay::ProngsRelAngle(Int_t ip1,Int_t ip2) const
385{
386 //
387 // Relative angle between two prongs
388 //
389 TVector3 momA(PxProng(ip1),PyProng(ip1),PzProng(ip1));
390 TVector3 momB(PxProng(ip2),PyProng(ip2),PzProng(ip2));
391
392 Double_t angle = momA.Angle(momB);
393
394 return angle;
395}
396//----------------------------------------------------------------------------
397Double_t AliAODRecoDecay::QlProng(Int_t ip) const
398{
399 //
400 // Longitudinal momentum of prong w.r.t. to total momentum
401 //
402 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
403 TVector3 momTot(Px(),Py(),Pz());
404
405 return mom.Dot(momTot)/momTot.Mag();
406}
407//----------------------------------------------------------------------------
408Double_t AliAODRecoDecay::QtProng(Int_t ip) const
409{
410 //
411 // Transverse momentum of prong w.r.t. to total momentum
412 //
413 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
414 TVector3 momTot(Px(),Py(),Pz());
415
416 return mom.Perp(momTot);
417}
418//----------------------------------------------------------------------------
419Double_t AliAODRecoDecay::QlProngFlightLine(Int_t ip,Double_t point[3]) const
420{
421 //
422 // Longitudinal momentum of prong w.r.t. to flight line between "point"
423 // and fSecondaryVtx
424 //
425 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
426 TVector3 fline(GetSecVtxX()-point[0],
427 GetSecVtxY()-point[1],
428 GetSecVtxZ()-point[2]);
429
430 return mom.Dot(fline)/fline.Mag();
431}
432//----------------------------------------------------------------------------
433Double_t AliAODRecoDecay::QtProngFlightLine(Int_t ip,Double_t point[3]) const
434{
435 //
436 // Transverse momentum of prong w.r.t. to flight line between "point" and
437 // fSecondaryVtx
438 //
439 TVector3 mom(PxProng(ip),PyProng(ip),PzProng(ip));
440 TVector3 fline(GetSecVtxX()-point[0],
441 GetSecVtxY()-point[1],
442 GetSecVtxZ()-point[2]);
443
444 return mom.Perp(fline);
445}
446//--------------------------------------------------------------------------