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Update of D+ classes: added acceptance cut, added histograms (Francesco)
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1 /**************************************************************************
2  * Copyright(c) 1998-2006, ALICE Experiment at CERN, All rights reserved. *
3  *                                                                        *
4  * Author: The ALICE Off-line Project.                                    *
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13  * provided "as is" without express or implied warranty.                  *
14  **************************************************************************/
15
16 /////////////////////////////////////////////////////////////
17 //
18 // Base class for AOD reconstructed heavy-flavour 3-prong decay
19 //
20 // Author: E.Bruna bruna@to.infn.it, F.Prino prino@to.infn.it
21 /////////////////////////////////////////////////////////////
22
23 #include <TDatabasePDG.h>
24 #include "AliAODRecoDecayHF.h"
25 #include "AliAODRecoDecayHF3Prong.h"
26 #include "AliAODTrack.h"
27
28 ClassImp(AliAODRecoDecayHF3Prong)
29
30 //--------------------------------------------------------------------------
31 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong() :
32   AliAODRecoDecayHF(), 
33   fSigmaVert(0),
34   fDist12toPrim(0),
35   fDist23toPrim(0)
36 {
37   //
38   // Default Constructor
39   //
40 }
41 //--------------------------------------------------------------------------
42 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
43                                                  Double_t *px,Double_t *py,Double_t *pz,
44                                                  Double_t *d0,Double_t *d0err,
45                                                  Double_t *dca, Double_t sigvert,
46                                                  Double_t dist12,Double_t dist23,Short_t charge) :
47   AliAODRecoDecayHF(vtx2,3,charge,px,py,pz,d0,d0err),
48   fSigmaVert(sigvert),
49   fDist12toPrim(dist12),
50   fDist23toPrim(dist23)
51 {
52   //
53   // Constructor with AliAODVertex for decay vertex
54   //
55   SetDCAs(3,dca);
56 }
57 //--------------------------------------------------------------------------
58 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(AliAODVertex *vtx2,
59                                                  Double_t *d0,Double_t *d0err,
60                                                  Double_t *dca, Double_t sigvert,
61                                                  Double_t dist12,Double_t dist23, Short_t charge) :
62   AliAODRecoDecayHF(vtx2,3,charge,d0,d0err),
63   fSigmaVert(sigvert),
64   fDist12toPrim(dist12),
65   fDist23toPrim(dist23)
66 {
67   //
68   // Constructor with AliAODVertex for decay vertex and without prongs momenta
69   //
70   SetDCAs(3,dca);
71 }
72 //--------------------------------------------------------------------------
73 AliAODRecoDecayHF3Prong::AliAODRecoDecayHF3Prong(const AliAODRecoDecayHF3Prong &source) :
74   AliAODRecoDecayHF(source),
75   fSigmaVert(source.fSigmaVert),
76   fDist12toPrim(source.fDist12toPrim),
77   fDist23toPrim(source.fDist23toPrim)
78 {
79   //
80   // Copy constructor
81   //
82 }
83 //--------------------------------------------------------------------------
84 AliAODRecoDecayHF3Prong &AliAODRecoDecayHF3Prong::operator=(const AliAODRecoDecayHF3Prong &source)
85 {
86   //
87   // assignment operator
88   //
89   if(&source == this) return *this;
90
91   AliAODRecoDecayHF::operator=(source);
92
93   fDist12toPrim= source.fDist12toPrim;
94   fDist23toPrim= source.fDist23toPrim;
95   fSigmaVert= source.fSigmaVert;
96
97   return *this;
98 }
99 //-------------Temporary fix: overload AliAODRecoDecay::Charge()-----------
100 Short_t AliAODRecoDecayHF3Prong::Charge() const {
101   Short_t charge=0;
102   for(Int_t daught=0;daught<=2;daught++)charge=charge+((AliAODTrack*)GetDaughter(daught))->Charge();
103   return charge;
104 }
105 //--------------------------------------------------------------------------
106 Bool_t AliAODRecoDecayHF3Prong::SelectDplus(const Double_t *cuts)
107   const {
108 //
109 // This function compares the Dplus with a set of cuts:
110 //
111 // cuts[0] = inv. mass half width [GeV]   
112 // cuts[1] = pTK [GeV/c]
113 // cuts[2] = pTPi [GeV/c]
114 // cuts[3] = d0K [cm]   lower limit!
115 // cuts[4] = d0Pi [cm]  lower limit!
116 // cuts[5] = dist12 (cm)
117 // cuts[6] = sigmavert (cm)
118 // cuts[7] = dist prim-sec (cm)
119 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
120 // cuts[9] = cosThetaPoint
121 // cuts[10] = Sum d0^2 (cm^2)
122 // cuts[11] = dca cut (cm)
123 //
124 // If candidate Dplus does not pass the cuts return kFALSE
125 //
126
127   Double_t mDplusPDG = TDatabasePDG::Instance()->GetParticle(411)->Mass();
128   Double_t mDplus=InvMassDplus();
129   if(TMath::Abs(mDplus-mDplusPDG)>cuts[0])return kFALSE;
130   //single track
131   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon
132   if(TMath::Abs(PtProng(0)) < cuts[2] || TMath::Abs(Getd0Prong(0))<cuts[4])return kFALSE;//Pion1
133   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion2
134
135   //DCA
136   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
137
138   //2track cuts
139   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
140   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
141
142   //sec vert
143   if(fSigmaVert>cuts[6])return kFALSE;
144
145   if(DecayLength()<cuts[7])return kFALSE;
146
147   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
148   if(CosPointingAngle()   < cuts[9])return kFALSE;
149   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
150   if(sum2<cuts[10])return kFALSE;
151   return kTRUE;
152 }
153 //--------------------------------------------------------------------------
154 Bool_t AliAODRecoDecayHF3Prong::SelectDs(const Double_t *cuts,Int_t &okDsKKpi,Int_t &okDspiKK, Int_t &okMassPhi, Int_t &okMassK0star)
155   const {
156 //
157 // This function compares the Ds with a set of cuts 
158 // (same variables as D+, for now)
159 //
160 // cuts[0] = inv. mass half width [GeV]   
161 // cuts[1] = pTK [GeV/c]
162 // cuts[2] = pTPi [GeV/c]
163 // cuts[3] = d0K [cm]   lower limit!
164 // cuts[4] = d0Pi [cm]  lower limit!
165 // cuts[5] = dist12 (cm)
166 // cuts[6] = sigmavert (cm)
167 // cuts[7] = dist prim-sec (cm)
168 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
169 // cuts[9] = cosThetaPoint
170 // cuts[10] = Sum d0^2 (cm^2)
171 // cuts[11] = dca cut (cm)
172 // cuts[12] = max. inv. mass difference(Mphi-MKK) [GeV] 
173 // cuts[13] = max. inv. mass difference(MK0*-MKpi) [GeV] 
174 //
175 // If candidate Ds does not pass the cuts return kFALSE
176 //
177   Double_t mDsKKpi,mDspiKK;
178   okDsKKpi=1; okDspiKK=1;
179   okMassPhi=0; okMassK0star=0;
180
181   Double_t mDsPDG = TDatabasePDG::Instance()->GetParticle(431)->Mass();
182
183   mDsKKpi=InvMassDsKKpi();
184   mDspiKK=InvMassDspiKK();
185
186   if(TMath::Abs(mDsKKpi-mDsPDG)>cuts[0]) okDsKKpi = 0;
187   if(TMath::Abs(mDspiKK-mDsPDG)>cuts[0]) okDspiKK = 0;
188   if(!okDsKKpi && !okDspiKK) return kFALSE;
189
190   //single track
191   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Kaon1
192   if(TMath::Abs(PtProng(1)) < cuts[1] || TMath::Abs(Getd0Prong(1))<cuts[3])return kFALSE;//Kaon2
193   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
194
195   // cuts on resonant decays (via Phi or K0*)
196   Double_t mPhiPDG = TDatabasePDG::Instance()->GetParticle(333)->Mass();
197   Double_t mK0starPDG = TDatabasePDG::Instance()->GetParticle(313)->Mass();
198   if(okDsKKpi){
199     Double_t mass01phi=InvMass2Prongs(0,1,321,321);
200     Double_t mass12K0s=InvMass2Prongs(1,2,321,211);
201     if(TMath::Abs(mass01phi-mPhiPDG)<cuts[12]) okMassPhi=1;
202     if(TMath::Abs(mass12K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
203     if(!okMassPhi && !okMassK0star) okDsKKpi=kFALSE;
204   }
205   if(okDspiKK){
206     Double_t mass01K0s=InvMass2Prongs(0,1,211,321);
207     Double_t mass12phi=InvMass2Prongs(1,2,321,321);
208     if(TMath::Abs(mass01K0s-mK0starPDG)<cuts[13]) okMassK0star = 1;
209     if(TMath::Abs(mass12phi-mPhiPDG)<cuts[12]) okMassPhi=1;
210     if(!okMassPhi && !okMassK0star) okDspiKK=kFALSE;
211   }
212   if(!okDsKKpi && !okDspiKK) return kFALSE;
213
214
215
216   
217   //DCA
218   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
219
220   //2track cuts
221   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
222
223   //sec vert
224   if(fSigmaVert>cuts[6])return kFALSE;
225
226   if(DecayLength()<cuts[7])return kFALSE;
227
228   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
229   if(CosPointingAngle()   < cuts[9])return kFALSE;
230   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
231   if(sum2<cuts[10])return kFALSE;
232
233   return kTRUE;
234 }
235 //--------------------------------------------------------------------------
236 Bool_t AliAODRecoDecayHF3Prong::SelectLc(const Double_t *cuts,Int_t &okLcpKpi,Int_t &okLcpiKp)
237   const {
238 //
239 // This function compares the Lc with a set of cuts 
240 // (same variables as D+, for now)
241 //
242 // cuts[0] = inv. mass half width [GeV]   
243 // cuts[1] = pTP [GeV/c]
244 // cuts[2] = pTPi and pTK [GeV/c]
245 // cuts[3] = d0P [cm]   lower limit!
246 // cuts[4] = d0Pi and d0K [cm]  lower limit!
247 // cuts[5] = dist12 (cm)
248 // cuts[6] = sigmavert (cm)
249 // cuts[7] = dist prim-sec (cm)
250 // cuts[8] = pM=Max{pT1,pT2,pT3} (GeV/c)
251 // cuts[9] = cosThetaPoint
252 // cuts[10] = Sum d0^2 (cm^2)
253 // cuts[11] = dca cut (cm)
254 //
255 // If candidate Lc does not pass the cuts return kFALSE
256 //
257   Double_t mLcpKpi,mLcpiKp;
258   okLcpKpi=1; okLcpiKp=1;
259
260   Double_t mLcPDG = TDatabasePDG::Instance()->GetParticle(4122)->Mass();
261
262   mLcpKpi=InvMassLcpKpi();
263   mLcpiKp=InvMassLcpiKp();
264
265   if(TMath::Abs(mLcpKpi-mLcPDG)>cuts[0]) okLcpKpi = 0;
266   if(TMath::Abs(mLcpiKp-mLcPDG)>cuts[0]) okLcpiKp = 0;
267   if(!okLcpKpi && !okLcpiKp) return kFALSE;
268
269   //single track
270   if(TMath::Abs(PtProng(0)) < cuts[1] || TMath::Abs(Getd0Prong(0))<cuts[3])return kFALSE;//Proton
271   if(TMath::Abs(PtProng(1)) < cuts[2] || TMath::Abs(Getd0Prong(1))<cuts[4])return kFALSE;//Kaon
272   if(TMath::Abs(PtProng(2)) < cuts[2] || TMath::Abs(Getd0Prong(2))<cuts[4])return kFALSE;//Pion
273
274   //DCA
275   for(Int_t i=0;i<3;i++) if(GetDCA(i)>cuts[11])return kFALSE;
276
277   //2track cuts
278   if(fDist12toPrim<cuts[5] || fDist23toPrim<cuts[5])return kFALSE;
279   if(Getd0Prong(0)*Getd0Prong(1)<0. && Getd0Prong(2)*Getd0Prong(1)<0.)return kFALSE;
280
281   //sec vert
282   if(fSigmaVert>cuts[6])return kFALSE;
283
284   if(DecayLength()<cuts[7])return kFALSE;
285
286   if(TMath::Abs(PtProng(0))<cuts[8] && TMath::Abs(PtProng(1))<cuts[8] && TMath::Abs(PtProng(2))<cuts[8])return kFALSE;
287   if(CosPointingAngle()   < cuts[9])return kFALSE;
288   Double_t sum2=Getd0Prong(0)*Getd0Prong(0)+Getd0Prong(1)*Getd0Prong(1)+Getd0Prong(2)*Getd0Prong(2);
289   if(sum2<cuts[10])return kFALSE;
290
291   return kTRUE;
292 }