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ac903f1b | 1 | #ifndef ALIITSMULTRECONSTRUCTOR_H |
2 | #define ALIITSMULTRECONSTRUCTOR_H | |
3 | /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. * | |
4 | * See cxx source for full Copyright notice */ | |
5 | ||
fa9ed8e9 | 6 | //_________________________________________________________________________ |
ac903f1b | 7 | // |
fa9ed8e9 | 8 | // Implementation of the ITS-SPD trackleter class |
ac903f1b | 9 | // |
fa9ed8e9 | 10 | // It retrieves clusters in the pixels (theta and phi) and finds tracklets. |
11 | // These can be used to extract charged particle multiplicity from the ITS. | |
ac903f1b | 12 | // |
fa9ed8e9 | 13 | // A tracklet consists of two ITS clusters, one in the first pixel layer and |
14 | // one in the second. The clusters are associated if the differences in | |
15 | // Phi (azimuth) and Theta (polar angle) are within fiducial windows. | |
16 | // In case of multiple candidates the candidate with minimum | |
17 | // distance is selected. | |
18 | //_________________________________________________________________________ | |
1f9831ab | 19 | #include "AliTrackleter.h" |
f9f90134 | 20 | #include "AliITSsegmentationSPD.h" |
21 | #include "TMath.h" | |
ac903f1b | 22 | |
1f9831ab | 23 | class TBits; |
ac903f1b | 24 | class TTree; |
25 | class TH1F; | |
3ef75756 | 26 | class TH2F; |
1f9831ab | 27 | class AliITSDetTypeRec; |
ac903f1b | 28 | class AliITSgeom; |
1f9831ab | 29 | class AliESDEvent; |
30 | class AliESDtrack; | |
31 | class AliVertex; | |
6de485aa | 32 | class AliESDVertex; |
1f9831ab | 33 | class AliMultiplicity; |
f9f90134 | 34 | class AliRefArray; |
ac903f1b | 35 | |
1f9831ab | 36 | class AliITSMultReconstructor : public AliTrackleter |
ac903f1b | 37 | { |
38 | public: | |
1f9831ab | 39 | // |
40 | enum {kClTh,kClPh,kClZ,kClMC0,kClMC1,kClMC2,kClNPar}; | |
41 | enum {kTrTheta,kTrPhi,kTrDPhi,kTrDTheta,kTrLab1,kTrLab2,kClID1,kClID2,kTrNPar}; | |
d7c5c1e4 | 42 | enum {kSCTh,kSCPh,kSCLab,kSCID,kSCNPar}; |
1f9831ab | 43 | enum {kITSTPC,kITSSAP,kITSTPCBit=BIT(kITSTPC),kITSSAPBit=BIT(kITSSAP)}; // RS |
ac903f1b | 44 | AliITSMultReconstructor(); |
ddced3c8 | 45 | virtual ~AliITSMultReconstructor(); |
ac903f1b | 46 | |
1f9831ab | 47 | void Reconstruct(AliESDEvent* esd, TTree* treeRP); |
f9f90134 | 48 | void Reconstruct(TTree* tree, Float_t* vtx, Float_t* vtxRes=0); // old reconstructor invocation |
49 | void ReconstructMix(TTree* clusterTree, TTree* clusterTreeMix, Float_t* vtx, Float_t* vtrRes=0); | |
1f9831ab | 50 | void FindTracklets(const Float_t* vtx); |
9b373e9a | 51 | void LoadClusterFiredChips(TTree* tree); |
7b116aa1 | 52 | void FlagClustersInOverlapRegions(Int_t ic1,Int_t ic2); |
34581d1e | 53 | void FlagTrackClusters(Int_t id); |
6de485aa | 54 | void FlagIfSecondary(AliESDtrack* track, const AliVertex* vtx); |
55 | void FlagV0s(const AliESDVertex *vtx); | |
1f9831ab | 56 | void ProcessESDTracks(); |
6de485aa | 57 | Bool_t CanBeElectron(const AliESDtrack* trc) const; |
1f9831ab | 58 | |
f9f90134 | 59 | virtual void CreateMultiplicityObject(); |
1f9831ab | 60 | // |
7b116aa1 | 61 | // Following members are set via AliITSRecoParam |
f9f90134 | 62 | void SetPhiWindow(Float_t w=0.08) {fDPhiWindow=w; fDPhiWindow2 = w*w;} |
63 | void SetThetaWindow(Float_t w=0.025) {fDThetaWindow=w; fDThetaWindow2=w*w;} | |
fa9ed8e9 | 64 | void SetPhiShift(Float_t w=0.0045) {fPhiShift=w;} |
7b116aa1 | 65 | void SetRemoveClustersFromOverlaps(Bool_t b = kFALSE) {fRemoveClustersFromOverlaps = b;} |
66 | void SetPhiOverlapCut(Float_t w=0.005) {fPhiOverlapCut=w;} | |
67 | void SetZetaOverlapCut(Float_t w=0.05) {fZetaOverlapCut=w;} | |
7c6da836 | 68 | void SetPhiRotationAngle(Float_t w=0.0) {fPhiRotationAngle=w;} |
7b116aa1 | 69 | |
f9f90134 | 70 | Int_t GetNClustersLayer1() const {return fNClustersLay[0];} |
71 | Int_t GetNClustersLayer2() const {return fNClustersLay[1];} | |
72 | Int_t GetNClustersLayer(Int_t i) const {return fNClustersLay[i];} | |
ac903f1b | 73 | Int_t GetNTracklets() const {return fNTracklets;} |
968e8539 | 74 | Int_t GetNSingleClusters() const {return fNSingleCluster;} |
9b373e9a | 75 | Short_t GetNFiredChips(Int_t layer) const {return fNFiredChips[layer];} |
ac903f1b | 76 | |
f9f90134 | 77 | Float_t* GetClusterLayer1(Int_t n) {return &fClustersLay[0][n*kClNPar];} |
78 | Float_t* GetClusterLayer2(Int_t n) {return &fClustersLay[1][n*kClNPar];} | |
79 | Float_t* GetClusterOfLayer(Int_t lr,Int_t n) {return &fClustersLay[lr][n*kClNPar];} | |
80 | ||
ac903f1b | 81 | Float_t* GetTracklet(Int_t n) {return fTracklets[n];} |
968e8539 | 82 | Float_t* GetCluster(Int_t n) {return fSClusters[n];} |
ac903f1b | 83 | |
f9f90134 | 84 | void SetScaleDThetaBySin2T(Bool_t v=kTRUE) {fScaleDTBySin2T = v;} |
85 | Bool_t GetScaleDThetaBySin2T() const {return fScaleDTBySin2T;} | |
86 | // | |
87 | void SetNStdDev(Float_t f=1.) {fNStdDev = f<0.01 ? 0.01 : f; fNStdDevSq=TMath::Sqrt(fNStdDev);} | |
88 | Float_t GetNStdDev() const {return fNStdDev;} | |
89 | // | |
ac903f1b | 90 | void SetHistOn(Bool_t b=kFALSE) {fHistOn=b;} |
91 | void SaveHists(); | |
3ef75756 | 92 | |
1f9831ab | 93 | AliITSDetTypeRec *GetDetTypeRec() const {return fDetTypeRec;} |
94 | void SetDetTypeRec(AliITSDetTypeRec *ptr){fDetTypeRec = ptr;} | |
6de485aa | 95 | // |
96 | void SetCutPxDrSPDin(Float_t v=0.1) { fCutPxDrSPDin = v;} | |
97 | void SetCutPxDrSPDout(Float_t v=0.15) { fCutPxDrSPDout = v;} | |
98 | void SetCutPxDz(Float_t v=0.2) { fCutPxDz = v;} | |
99 | void SetCutDCArz(Float_t v=0.5) { fCutDCArz = v;} | |
100 | void SetCutMinElectronProbTPC(Float_t v=0.5) { fCutMinElectronProbTPC = v;} | |
101 | void SetCutMinElectronProbESD(Float_t v=0.1) { fCutMinElectronProbESD = v;} | |
102 | void SetCutMinP(Float_t v=0.05) { fCutMinP = v;} | |
103 | void SetCutMinRGamma(Float_t v=2.) { fCutMinRGamma = v;} | |
104 | void SetCutMinRK0(Float_t v=1.) { fCutMinRK0 = v;} | |
105 | void SetCutMinPointAngle(Float_t v=0.98) { fCutMinPointAngle = v;} | |
106 | void SetCutMaxDCADauther(Float_t v=0.5) { fCutMaxDCADauther = v;} | |
107 | void SetCutMassGamma(Float_t v=0.03) { fCutMassGamma = v;} | |
108 | void SetCutMassGammaNSigma(Float_t v=5.) { fCutMassGammaNSigma = v;} | |
109 | void SetCutMassK0(Float_t v=0.03) { fCutMassK0 = v;} | |
110 | void SetCutMassK0NSigma(Float_t v=5.) { fCutMassK0NSigma = v;} | |
111 | void SetCutChi2cGamma(Float_t v=2.) { fCutChi2cGamma = v;} | |
112 | void SetCutChi2cK0(Float_t v=2.) { fCutChi2cK0 = v;} | |
113 | void SetCutGammaSFromDecay(Float_t v=-10.) { fCutGammaSFromDecay = v;} | |
114 | void SetCutK0SFromDecay(Float_t v=-10.) { fCutK0SFromDecay = v;} | |
115 | void SetCutMaxDCA(Float_t v=1.) { fCutMaxDCA = v;} | |
116 | // | |
117 | Float_t GetCutPxDrSPDin() const {return fCutPxDrSPDin;} | |
118 | Float_t GetCutPxDrSPDout() const {return fCutPxDrSPDout;} | |
119 | Float_t GetCutPxDz() const {return fCutPxDz;} | |
120 | Float_t GetCutDCArz() const {return fCutDCArz;} | |
121 | Float_t GetCutMinElectronProbTPC() const {return fCutMinElectronProbTPC;} | |
122 | Float_t GetCutMinElectronProbESD() const {return fCutMinElectronProbESD;} | |
123 | Float_t GetCutMinP() const {return fCutMinP;} | |
124 | Float_t GetCutMinRGamma() const {return fCutMinRGamma;} | |
125 | Float_t GetCutMinRK0() const {return fCutMinRK0;} | |
126 | Float_t GetCutMinPointAngle() const {return fCutMinPointAngle;} | |
127 | Float_t GetCutMaxDCADauther() const {return fCutMaxDCADauther;} | |
128 | Float_t GetCutMassGamma() const {return fCutMassGamma;} | |
129 | Float_t GetCutMassGammaNSigma() const {return fCutMassGammaNSigma;} | |
130 | Float_t GetCutMassK0() const {return fCutMassK0;} | |
131 | Float_t GetCutMassK0NSigma() const {return fCutMassK0NSigma;} | |
132 | Float_t GetCutChi2cGamma() const {return fCutChi2cGamma;} | |
133 | Float_t GetCutChi2cK0() const {return fCutChi2cK0;} | |
134 | Float_t GetCutGammaSFromDecay() const {return fCutGammaSFromDecay;} | |
135 | Float_t GetCutK0SFromDecay() const {return fCutK0SFromDecay;} | |
136 | Float_t GetCutMaxDCA() const {return fCutMaxDCA;} | |
137 | // | |
f9f90134 | 138 | void InitAux(); |
139 | void ClusterPos2Angles(const Float_t *vtx); | |
140 | void ClusterPos2Angles(Float_t *clPar, const Float_t *vtx); | |
141 | Int_t AssociateClusterOfL1(Int_t iC1); | |
142 | Int_t StoreTrackletForL2Cluster(Int_t iC2); | |
143 | void StoreL1Singles(); | |
144 | TClonesArray* GetClustersOfLayer(Int_t il) const {return fClArr[il];} | |
145 | void LoadClusters() {LoadClusterArrays(fTreeRP);} | |
146 | void SetTreeRP(TTree* rp) {fTreeRP = rp;} | |
147 | void SetTreeRPMix(TTree* rp=0) {fTreeRPMix = rp;} | |
148 | Bool_t AreClustersLoaded() const {return fClustersLoaded;} | |
149 | Bool_t GetCreateClustersCopy() const {return fCreateClustersCopy;} | |
150 | Bool_t IsRecoDone() const {return fRecoDone;} | |
151 | void SetCreateClustersCopy(Bool_t v=kTRUE) {fCreateClustersCopy=v;} | |
152 | // | |
153 | Float_t* GetClustersArray(Int_t lr) const {return (Float_t*) (lr==0) ? fClustersLay[0]:fClustersLay[1];} | |
154 | Int_t* GetPartnersOfL2() const {return (Int_t*)fPartners;} | |
155 | Float_t* GetMinDistsOfL2() const {return (Float_t*)fMinDists;} | |
156 | Double_t GetDPhiShift() const {return fDPhiShift;} | |
157 | Double_t GetDPhiWindow2() const {return fDPhiWindow2;} | |
158 | Double_t GetDThetaWindow2() const {return fDThetaWindow2;} | |
159 | Double_t CalcDist(Double_t dphi, Double_t dtheta, Double_t theta) const; | |
160 | // | |
161 | protected: | |
162 | void SetClustersLoaded(Bool_t v=kTRUE) {fClustersLoaded = v;} | |
3ef75756 | 163 | AliITSMultReconstructor(const AliITSMultReconstructor& mr); |
7537d03c | 164 | AliITSMultReconstructor& operator=(const AliITSMultReconstructor& mr); |
f9f90134 | 165 | void CalcThetaPhi(float dx,float dy,float dz,float &theta,float &phi) const; |
1f9831ab | 166 | AliITSDetTypeRec* fDetTypeRec; //! pointer to DetTypeRec |
167 | AliESDEvent* fESDEvent; //! pointer to ESD event | |
168 | TTree* fTreeRP; //! ITS recpoints | |
f9f90134 | 169 | TTree* fTreeRPMix; //! ITS recpoints for mixing |
170 | AliRefArray* fUsedClusLay[2][2]; //! RS: clusters usage in ESD tracks | |
171 | // | |
172 | Float_t* fClustersLay[2]; //! clusters in the SPD layers of ITS | |
173 | Int_t* fDetectorIndexClustersLay[2]; //! module index for clusters in ITS layers | |
174 | Bool_t* fOverlapFlagClustersLay[2]; //! flag for clusters in the overlap regions in ITS layers | |
ac903f1b | 175 | |
f9f90134 | 176 | Float_t** fTracklets; //! tracklets |
177 | Float_t** fSClusters; //! single clusters (unassociated) | |
ac903f1b | 178 | |
f9f90134 | 179 | Int_t fNClustersLay[2]; // Number of clusters on each layer |
9b373e9a | 180 | Int_t fNTracklets; // Number of tracklets |
181 | Int_t fNSingleCluster; // Number of unassociated clusters | |
182 | Short_t fNFiredChips[2]; // Number of fired chips in the two SPD layers | |
6de485aa | 183 | // |
7b116aa1 | 184 | // Following members are set via AliITSRecoParam |
6de485aa | 185 | // |
f9f90134 | 186 | Float_t fDPhiWindow; // Search window in phi |
187 | Float_t fDThetaWindow; // Search window in theta | |
fa9ed8e9 | 188 | Float_t fPhiShift; // Phi shift reference value (at 0.5 T) |
7b116aa1 | 189 | Bool_t fRemoveClustersFromOverlaps; // Option to skip clusters in the overlaps |
190 | Float_t fPhiOverlapCut; // Fiducial window in phi for overlap cut | |
191 | Float_t fZetaOverlapCut; // Fiducial window in eta for overlap cut | |
7c6da836 | 192 | Float_t fPhiRotationAngle; // Angle to rotate the inner layer cluster for combinatorial reco only |
f9f90134 | 193 | // |
194 | Bool_t fScaleDTBySin2T; // use in distance definition | |
195 | Float_t fNStdDev; // number of standard deviations to keep | |
196 | Float_t fNStdDevSq; // sqrt of number of standard deviations to keep | |
197 | // | |
6de485aa | 198 | // cuts for secondaries identification |
199 | Float_t fCutPxDrSPDin; // max P*DR for primaries involving at least 1 SPD | |
200 | Float_t fCutPxDrSPDout; // max P*DR for primaries not involving any SPD | |
201 | Float_t fCutPxDz; // max P*DZ for primaries | |
202 | Float_t fCutDCArz; // max DR or DZ for primares | |
203 | // | |
204 | // cuts for flagging tracks in V0s | |
205 | Float_t fCutMinElectronProbTPC; // min probability for e+/e- PID involving TPC | |
206 | Float_t fCutMinElectronProbESD; // min probability for e+/e- PID not involving TPC | |
207 | // | |
208 | Float_t fCutMinP; // min P of V0 | |
209 | Float_t fCutMinRGamma; // min transv. distance from ESDVertex to V0 for gammas | |
210 | Float_t fCutMinRK0; // min transv. distance from ESDVertex to V0 for K0s | |
211 | Float_t fCutMinPointAngle; // min pointing angle cosine | |
212 | Float_t fCutMaxDCADauther; // max DCA of daughters at V0 | |
213 | Float_t fCutMassGamma; // max gamma mass | |
214 | Float_t fCutMassGammaNSigma; // max standard deviations from 0 for gamma | |
215 | Float_t fCutMassK0; // max K0 mass difference from PGD value | |
216 | Float_t fCutMassK0NSigma; // max standard deviations for K0 mass from PDG value | |
217 | Float_t fCutChi2cGamma; // max constrained chi2 cut for gammas | |
218 | Float_t fCutChi2cK0; // max constrained chi2 cut for K0s | |
219 | Float_t fCutGammaSFromDecay; // min path*P for gammas | |
220 | Float_t fCutK0SFromDecay; // min path*P for K0s | |
221 | Float_t fCutMaxDCA; // max DCA for V0 at ESD vertex | |
222 | ||
9b373e9a | 223 | Bool_t fHistOn; // Option to define and fill the histograms |
ddced3c8 | 224 | |
9b373e9a | 225 | TH1F* fhClustersDPhiAcc; // Phi2 - Phi1 for tracklets |
226 | TH1F* fhClustersDThetaAcc; // Theta2 - Theta1 for tracklets | |
9b373e9a | 227 | TH1F* fhClustersDPhiAll; // Phi2 - Phi1 all the combinations |
228 | TH1F* fhClustersDThetaAll; // Theta2 - Theta1 all the combinations | |
3ef75756 | 229 | |
9b373e9a | 230 | TH2F* fhDPhiVsDThetaAll; // 2D plot for all the combinations |
231 | TH2F* fhDPhiVsDThetaAcc; // same plot for tracklets | |
9b373e9a | 232 | |
233 | TH1F* fhetaTracklets; // Pseudorapidity distr. for tracklets | |
234 | TH1F* fhphiTracklets; // Azimuthal (Phi) distr. for tracklets | |
235 | TH1F* fhetaClustersLay1; // Pseudorapidity distr. for Clusters L. 1 | |
236 | TH1F* fhphiClustersLay1; // Azimuthal (Phi) distr. for Clusters L. 1 | |
237 | ||
f9f90134 | 238 | // temporary stuff for single event trackleting |
239 | Double_t fDPhiShift; // shift in dphi due to the curvature | |
240 | Double_t fDPhiWindow2; // phi window^2 | |
241 | Double_t fDThetaWindow2; // theta window^2 | |
242 | Int_t* fPartners; //! L2 partners of L1 | |
243 | Int_t* fAssociatedLay1; //! association flag | |
244 | Float_t* fMinDists; //! smallest distances for L2->L1 | |
245 | AliRefArray* fBlackList; //! blacklisted cluster references | |
246 | Bool_t fStoreRefs[2][2]; //! which cluster to track refs to store | |
247 | // | |
248 | // this is for the analysis mode only | |
249 | TClonesArray *fClArr[2]; //! original clusters | |
250 | Bool_t fCreateClustersCopy; // read and clone clusters directly from the tree | |
251 | Bool_t fClustersLoaded; // flag of clusters loaded | |
252 | Bool_t fRecoDone; // flag that reconstruction is done | |
253 | // | |
254 | AliITSsegmentationSPD fSPDSeg; // SPD segmentation model | |
255 | // | |
256 | void LoadClusterArrays(TTree* tree, TTree* treeMix=0); | |
257 | void LoadClusterArrays(TTree* tree,int il); | |
ac903f1b | 258 | |
f9f90134 | 259 | ClassDef(AliITSMultReconstructor,10) |
ac903f1b | 260 | }; |
261 | ||
f9f90134 | 262 | //____________________________________________________________________ |
263 | inline void AliITSMultReconstructor::ClusterPos2Angles(Float_t *clPar, const Float_t *vtx) | |
264 | { | |
265 | // convert cluster coordinates to angles wrt vertex | |
266 | Float_t x = clPar[kClTh] - vtx[0]; | |
267 | Float_t y = clPar[kClPh] - vtx[1]; | |
268 | Float_t z = clPar[kClZ] - vtx[2]; | |
269 | Float_t r = TMath::Sqrt(x*x + y*y + z*z); | |
270 | clPar[kClTh] = TMath::ACos(z/r); // Store Theta | |
271 | clPar[kClPh] = TMath::Pi() + TMath::ATan2(-y,-x); // Store Phi | |
272 | // | |
273 | } | |
274 | ||
275 | //____________________________________________________________________ | |
276 | inline Double_t AliITSMultReconstructor::CalcDist(Double_t dphi, Double_t dtheta, Double_t theta) const | |
277 | { | |
278 | // calculate eliptical distance. theta is the angle of cl1, dtheta = tht(cl1)-tht(cl2) | |
279 | dphi = TMath::Abs(dphi) - fDPhiShift; | |
280 | if (fScaleDTBySin2T) { | |
281 | double sinTI = TMath::Sin(theta-dtheta/2); | |
282 | sinTI *= sinTI; | |
283 | dtheta /= sinTI>1.e-6 ? sinTI : 1.e-6; | |
284 | } | |
285 | return dphi*dphi/fDPhiWindow2 + dtheta*dtheta/fDThetaWindow2; | |
286 | } | |
287 | ||
288 | //____________________________________________________________________ | |
289 | inline void AliITSMultReconstructor::CalcThetaPhi(float x, float y,float z,float &theta,float &phi) const | |
290 | { | |
291 | // get theta and phi in tracklet convention | |
292 | theta = TMath::ACos(z/TMath::Sqrt(x*x + y*y + z*z)); | |
293 | phi = TMath::Pi() + TMath::ATan2(-y,-x); | |
294 | } | |
295 | ||
296 | ||
ac903f1b | 297 | #endif |