1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
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 **************************************************************************/
16 //====================================================================================================================================================
18 // Description of an ALICE muon forward track pair, i.e. a pair of AliMuonForwardTrack objects
20 // Contact author: antonio.uras@cern.ch
22 //====================================================================================================================================================
25 #include "AliMUONTrackParam.h"
26 #include "TParticle.h"
27 #include "AliMuonForwardTrack.h"
28 #include "AliMUONTrackExtrap.h"
29 #include "TClonesArray.h"
30 #include "TDatabasePDG.h"
31 #include "TLorentzVector.h"
33 #include "AliMuonForwardTrackPair.h"
35 ClassImp(AliMuonForwardTrackPair)
37 //====================================================================================================================================================
39 AliMuonForwardTrackPair::AliMuonForwardTrackPair():
41 fMuonForwardTracks(0),
47 // default constructor
49 fMuonForwardTracks = new TClonesArray("AliMuonForwardTrack", 2);
53 //====================================================================================================================================================
55 AliMuonForwardTrackPair::AliMuonForwardTrackPair(AliMuonForwardTrack *track0, AliMuonForwardTrack *track1):
57 fMuonForwardTracks(0),
63 fMuonForwardTracks = new TClonesArray("AliMuonForwardTrack", 2);
65 new ((*fMuonForwardTracks)[0]) AliMuonForwardTrack(*track0);
66 new ((*fMuonForwardTracks)[1]) AliMuonForwardTrack(*track1);
72 //====================================================================================================================================================
74 AliMuonForwardTrackPair::AliMuonForwardTrackPair(const AliMuonForwardTrackPair& trackPair):
76 fMuonForwardTracks(trackPair.fMuonForwardTracks),
77 fKinemMC(trackPair.fKinemMC),
78 fKinem(trackPair.fKinem),
79 fIsKinemSet(trackPair.fIsKinemSet)
86 //====================================================================================================================================================
88 AliMuonForwardTrackPair& AliMuonForwardTrackPair::operator=(const AliMuonForwardTrackPair& trackPair) {
92 // check assignement to self
93 if (this == &trackPair) return *this;
95 // base class assignement
96 AliMuonForwardTrackPair::operator=(trackPair);
101 fMuonForwardTracks = trackPair.fMuonForwardTracks;
102 fKinemMC = trackPair.fKinemMC;
103 fKinem = trackPair.fKinem;
104 fIsKinemSet = trackPair.fIsKinemSet;
110 //====================================================================================================================================================
112 void AliMuonForwardTrackPair::SetTrack(Int_t iTrack, AliMuonForwardTrack *track) {
114 if (iTrack==0 || iTrack==1) {
115 new ((*fMuonForwardTracks)[iTrack]) AliMuonForwardTrack(*track);
120 //====================================================================================================================================================
122 Double_t AliMuonForwardTrackPair::GetWeightedOffset(Double_t x, Double_t y, Double_t z) {
124 Double_t weightedOffset[2]={0};
126 weightedOffset[0] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetWeightedOffset(x, y, z);
127 weightedOffset[1] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetWeightedOffset(x, y, z);
129 Double_t weightedOffsetDimuon = TMath::Sqrt(0.5 * (weightedOffset[0]*weightedOffset[0] + weightedOffset[1]*weightedOffset[1]));
131 return weightedOffsetDimuon;
135 //====================================================================================================================================================
137 Double_t AliMuonForwardTrackPair::GetMassWithoutMFT(Double_t x, Double_t y, Double_t z, Int_t nClusters) {
139 Int_t idCluster[2] = {0};
141 idCluster[0] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetNMUONClusters() - nClusters;
142 idCluster[1] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetNMUONClusters() - nClusters;
144 if (idCluster[0]<0) idCluster[0] = 0;
145 if (idCluster[1]<0) idCluster[1] = 0;
147 AliMUONTrackParam *param0 = ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetTrackParamAtMUONCluster(idCluster[0]);
148 AliMUONTrackParam *param1 = ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetTrackParamAtMUONCluster(idCluster[1]);
150 AliDebug(2, Form("MUON before extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
151 param0->Px(), param0->Py(), param0->Pz(),
152 param1->Px(), param1->Py(), param1->Pz()));
154 AliDebug(2, Form("Extrapolating 1st muon from z = %f to z = %f", param0->GetZ(), z));
155 AliMUONTrackExtrap::ExtrapToVertex(param0, x, y, z, 0., 0.); // this should reproduce what is done in AliMUONESDInterface::MUONToESD(...)
156 AliDebug(2, Form("Extrapolating 2nd muon from z = %f to z = %f", param1->GetZ(), z));
157 AliMUONTrackExtrap::ExtrapToVertex(param1, x, y, z, 0., 0.); // this should reproduce what is done in AliMUONESDInterface::MUONToESD(...)
159 AliDebug(2, Form("MUON after extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
160 param0->Px(), param0->Py(), param0->Pz(),
161 param1->Px(), param1->Py(), param1->Pz()));
163 Double_t momentum[2] = {0};
165 momentum[0] = param0->P();
166 momentum[1] = param1->P();
168 Double_t mMu = TDatabasePDG::Instance()->GetParticle("mu-")->Mass();
172 dimu.SetE(TMath::Sqrt(mMu*mMu + momentum[0]*momentum[0]) + TMath::Sqrt(mMu*mMu + momentum[1]*momentum[1]));
174 dimu.SetPx(param0->Px() + param1->Px());
175 dimu.SetPy(param0->Py() + param1->Py());
176 dimu.SetPz(param0->Pz() + param1->Pz());
182 //====================================================================================================================================================
184 void AliMuonForwardTrackPair::SetKinemMC() {
186 if ( !(((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()) ||
187 !(((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()) ) return;
189 AliDebug(2, Form("MC: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
190 ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Px(),
191 ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Py(),
192 ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Pz(),
193 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Px(),
194 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Py(),
195 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Pz()));
197 fKinemMC.SetE(((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Energy() +
198 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Energy());
200 fKinemMC.SetPx(((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Px() +
201 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Px());
203 fKinemMC.SetPy(((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Py() +
204 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Py());
206 fKinemMC.SetPz(((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetMCTrackRef()->Pz() +
207 ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetMCTrackRef()->Pz());
211 //====================================================================================================================================================
213 void AliMuonForwardTrackPair::SetKinem(Double_t z, Int_t nClusters) {
215 // if (!fMuonForwardTracks) return kFALSE;
216 // if (!fMuonForwardTracks->At(0) || !fMuonForwardTracks->At(1)) return kFALSE;
218 Int_t idCluster[2] = {0};
220 idCluster[0] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetNMFTClusters() - nClusters;
221 idCluster[1] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetNMFTClusters() - nClusters;
223 if (idCluster[0]<0) idCluster[0] = 0;
224 if (idCluster[1]<0) idCluster[1] = 0;
226 Double_t momentum[2] = {0};
228 AliMUONTrackParam *param0 = ((AliMuonForwardTrack*) fMuonForwardTracks->At(0))->GetTrackParamAtMFTCluster(idCluster[0]);
229 AliMUONTrackParam *param1 = ((AliMuonForwardTrack*) fMuonForwardTracks->At(1))->GetTrackParamAtMFTCluster(idCluster[1]);
231 AliDebug(2, Form("MFT before extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
232 param0->Px(), param0->Py(), param0->Pz(),
233 param1->Px(), param1->Py(), param1->Pz()));
235 if (TMath::Abs(z)<1e6) {
236 AliDebug(2, Form("Extrapolating 1st muon from z = %f to z = %f", param0->GetZ(), z));
237 AliMUONTrackExtrap::ExtrapToZCov(param0, z);
238 AliDebug(2, Form("Extrapolating 2nd muon from z = %f to z = %f", param1->GetZ(), z));
239 AliMUONTrackExtrap::ExtrapToZCov(param1, z);
242 AliDebug(2, Form("MFT after extrap: 1st muon = (%f, %f, %f) 2nd muon = (%f, %f, %f)",
243 param0->Px(), param0->Py(), param0->Pz(),
244 param1->Px(), param1->Py(), param1->Pz()));
246 momentum[0] = (param0->P());
247 momentum[1] = (param1->P());
249 Double_t mMu = TDatabasePDG::Instance()->GetParticle("mu-")->Mass();
251 fKinem.SetE(TMath::Sqrt(mMu*mMu + momentum[0]*momentum[0]) + TMath::Sqrt(mMu*mMu + momentum[1]*momentum[1]));
252 fKinem.SetPx(param0->Px() + param1->Px());
253 fKinem.SetPy(param0->Py() + param1->Py());
254 fKinem.SetPz(param0->Pz() + param1->Pz());
258 // return fKinem.M();
262 //====================================================================================================================================================
264 Bool_t AliMuonForwardTrackPair::IsResonance() {
266 Bool_t result = kFALSE;
268 Int_t labelMC[2] = {0};
269 Int_t codePDG[2] = {0};
271 for (Int_t iTrack=0; iTrack<2; iTrack++) {
272 labelMC[iTrack] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(iTrack))->GetParentMCLabel(0);
273 codePDG[iTrack] = ((AliMuonForwardTrack*) fMuonForwardTracks->At(iTrack))->GetParentPDGCode(0);
276 AliDebug(1, Form("Muons' mothers: (%d, %d)", labelMC[0], labelMC[1]));
278 if (labelMC[0]==labelMC[1] && codePDG[0]==codePDG[1] && (codePDG[0]== 113 ||
282 codePDG[0]==100443 ||
284 codePDG[0]==100553 ) ) result = kTRUE;
286 if (result) AliDebug(1, Form("Pair is a resonance %d", codePDG[0]));
292 //====================================================================================================================================================