Fixed typo
[u/mrichter/AliRoot.git] / PWG3 / vertexingHF / AliAODRecoCascadeHF.cxx
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05d80dd6 1/**************************************************************************
2 * Copyright(c) 1998-2008, 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// Class for AOD reconstructed heavy-flavour cascades
19//
c3fe1eed 20// Author: X-M. Zhang, zhangxm@iopp.ccnu.edu.cn
05d80dd6 21/////////////////////////////////////////////////////////////
22
23#include <TVector3.h>
24#include <TDatabasePDG.h>
25#include "AliAODRecoDecay.h"
26#include "AliAODVertex.h"
27#include "AliAODRecoDecayHF2Prong.h"
28#include "AliAODRecoCascadeHF.h"
29
30ClassImp(AliAODRecoCascadeHF)
31//-----------------------------------------------------------------------------
32
33AliAODRecoCascadeHF::AliAODRecoCascadeHF() :
dcfa35b3 34 AliAODRecoDecayHF2Prong()
05d80dd6 35{
36 //
37 // Default Constructor
38 //
39}
40//-----------------------------------------------------------------------------
41AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
42 Double_t *px, Double_t *py, Double_t *pz,
43 Double_t *d0, Double_t *d0err, Double_t dca) :
dcfa35b3 44 AliAODRecoDecayHF2Prong(vtx2, px, py, pz, d0, d0err, dca)
05d80dd6 45{
46 //
47 // Constructor with AliAODVertex for decay vertex
48 //
49 SetCharge(charge);
50}
51//-----------------------------------------------------------------------------
52AliAODRecoCascadeHF::AliAODRecoCascadeHF(AliAODVertex *vtx2, Short_t charge,
53 Double_t *d0, Double_t *d0err, Double_t dca) :
dcfa35b3 54 AliAODRecoDecayHF2Prong(vtx2, d0, d0err, dca)
05d80dd6 55{
56 //
57 // Constructor with decay vertex and without prongs momenta
58 //
59 SetCharge(charge);
60}
61//-----------------------------------------------------------------------------
62AliAODRecoCascadeHF::AliAODRecoCascadeHF(const AliAODRecoCascadeHF &source) :
dcfa35b3 63 AliAODRecoDecayHF2Prong(source)
05d80dd6 64{
65 //
66 // Copy constructor
67 //
68}
69//-----------------------------------------------------------------------------
70AliAODRecoCascadeHF &AliAODRecoCascadeHF::operator=(const AliAODRecoCascadeHF &source)
71{
72 //
73 // assignment operator
74 //
75 if(&source == this) return *this;
76
77 AliAODRecoDecayHF2Prong::operator=(source);
78
05d80dd6 79 return *this;
80}
81//-----------------------------------------------------------------------------
82AliAODRecoCascadeHF::~AliAODRecoCascadeHF()
83{
84 //
85 // Default Destructor
86 //
87}
88//-----------------------------------------------------------------------------
89Double_t AliAODRecoCascadeHF::InvMassDstarKpipi() const
90{
91 //
92 // 3 prong invariant mass of the D0 daughters and the soft pion
93 //
94
95 Double_t px[3],py[3],pz[3];
96 UInt_t pdg[3]={321,211,211};
97 pdg[0] = (Charge()>0 ? 211 : 321); // positive daughter of D0
98 px[0] = Get2Prong()->PxProng(0);
99 py[0] = Get2Prong()->PyProng(0);
100 pz[0] = Get2Prong()->PzProng(0);
101 pdg[1] = (Charge()>0 ? 321 : 211); // negative daughter of D0
102 px[1] = Get2Prong()->PxProng(1);
103 py[1] = Get2Prong()->PyProng(1);
104 pz[1] = Get2Prong()->PzProng(1);
105 pdg[2] = 211; // soft pion
106 px[2] = PxProng(0);
107 py[2] = PyProng(0);
108 pz[2] = PzProng(0);
109 Short_t dummycharge=0;
110 Double_t dummyd0[3]={0,0,0};
111 AliAODRecoDecay *rd = new AliAODRecoDecay(0x0,3,dummycharge,px,py,pz,dummyd0);
112
113 Double_t minv = rd->InvMass(3,pdg);
114
115 delete rd; rd=NULL;
116
117 return minv;
118}
119//-----------------------------------------------------------------------------
120Bool_t AliAODRecoCascadeHF::SelectDstar(const Double_t *cutsDstar,
121 const Double_t *cutsD0,
122 Bool_t testD0) const
123{
124 //
125 // cutsDstar[0] = inv. mass half width of D* [GeV]
126 // cutsDstar[1] = half width of (M_Kpipi-M_D0) [GeV]
127 // cutsDstar[2] = PtMin of pi_s [GeV/c]
128 // cutsDstar[3] = PtMax of pi_s [GeV/c]
129 // cutsDstar[4] = theta, angle between the pi_s and decay plane of the D0 [rad]
130 //
131 // cutsD0[0] = inv. mass half width [GeV]
132 // cutsD0[1] = dca [cm]
133 // cutsD0[2] = cosThetaStar
134 // cutsD0[3] = pTK [GeV/c]
135 // cutsD0[4] = pTPi [GeV/c]
136 // cutsD0[5] = d0K [cm] upper limit!
137 // cutsD0[6] = d0Pi [cm] upper limit!
138 // cutsD0[7] = d0d0 [cm^2]
139 // cutsD0[8] = cosThetaPoint
140
141
142 // check that the D0 passes the cuts
143 // (if we have a D*+, it has to pass as D0,
144 // if we have a D*-, it has to pass as D0bar)
145
146 if(testD0) {
147 Int_t okD0=0,okD0bar=0;
148 Get2Prong()->SelectD0(cutsD0,okD0,okD0bar);
149 if((Charge()==+1 && !okD0) || (Charge()==-1 && !okD0bar)) return kFALSE;
150 }
151
152 if( (PtProng(0)<cutsDstar[2]) || (PtProng(0)>cutsDstar[3]) ) return kFALSE;
153
154 Double_t mDstar = TDatabasePDG::Instance()->GetParticle(413)->Mass();
155 Double_t invmDstar = InvMassDstarKpipi();
156 if(TMath::Abs(mDstar-invmDstar)>cutsDstar[0]) return kFALSE;
157
158 Double_t mD0 = TDatabasePDG::Instance()->GetParticle(421)->Mass();
159 if(TMath::Abs((mDstar-mD0)-DeltaInvMass())>cutsDstar[1]) return kFALSE;
160
161 TVector3 p3Trk0(Get2Prong()->PxProng(0),Get2Prong()->PyProng(0),Get2Prong()->PzProng(0)); // from D0
162 TVector3 p3Trk1(Get2Prong()->PxProng(1),Get2Prong()->PyProng(1),Get2Prong()->PzProng(1)); // from D0
163 TVector3 p3Trk2(PxProng(0),PyProng(0),PzProng(0)); // pi_s
164
165 TVector3 perp = p3Trk0.Cross(p3Trk1);
166 Double_t theta = p3Trk2.Angle(perp);
167 if(theta>(TMath::Pi()-theta)) theta = TMath::Pi() - theta;
168 theta = TMath::Pi()/2. - theta;
169
170 if(theta>cutsDstar[4]) return kFALSE;
171
172 Double_t alpha = p3Trk0.Angle(p3Trk2);
173 Double_t belta = p3Trk1.Angle(p3Trk2);
174
175 Double_t cosphi01 = TMath::Cos(alpha) / TMath::Cos(theta);
176 Double_t cosphi02 = TMath::Cos(belta) / TMath::Cos(theta);
177
178 Double_t phi01 = TMath::ACos(cosphi01);
179 Double_t phi02 = TMath::ACos(cosphi02);
180 Double_t phi00 = p3Trk0.Angle(p3Trk1);
181
182 if((phi01>phi00) || (phi02>phi00)) return kFALSE;
183
184 return kTRUE;
185}
186//-----------------------------------------------------------------------------