HMPID/AliHMPIDRecon.h

   1 #ifndef AliHMPIDRecon_h
   2 #define AliHMPIDRecon_h
   3
   4 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
   5  * See cxx source for full Copyright notice                               */
   6
   7 //////////////////////////////////////////////////////////////////////////
   8 //                                                                      //
   9 // AliHMPIDRecon                                                         //
  10 //                                                                      //
  11 // HMPID class to perfom pattern recognition based on Hough transfrom    //
  12 //                                                                      //
  13 //////////////////////////////////////////////////////////////////////////
  14
  15
  16 #include <TTask.h>        //base class
  17 #include <TVector3.h>     //fields
  18
  19 class TClonesArray; //CkovAngle()
  20 class AliESDtrack;  //CkovAngle()
  21
  22 class AliHMPIDRecon : public TTask
  23 {
  24 public :
  25              AliHMPIDRecon();
  26     virtual ~AliHMPIDRecon()                                                          {}
  27
  28
  29   void     CkovAngle    (AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean             );     //reconstructed Theta Cerenkov
  30   Bool_t   FindPhotCkov (Double_t cluX,Double_t cluY,Double_t &thetaCer,Double_t &phiCer    );     //find ckov angle for single photon candidate
  31   Double_t FindRingCkov (Int_t iNclus                                                       );     //best ckov for ring formed by found photon candidates
  32   Double_t FindRingArea (Double_t ckov                                                      )const;//estimated area of ring in cm^2
  33   Int_t    FlagPhot     (Double_t ckov                                                      );     //is photon ckov near most probable track ckov
  34   Double_t HoughResponse(                                                                   );     //most probable track ckov angle
  35   void     Propagate    (const TVector3  dir,      TVector3 &pos,Double_t z                 )const;//propagate photon alogn the line
  36   void     Refract      (      TVector3 &dir,                    Double_t n1,    Double_t n2)const;//refract photon on the boundary
  37   TVector2 TracePhot    (Double_t ckovTh,Double_t ckovPh                                    )const;//trace photon created by track to PC
  38   TVector2 TraceForward (TVector3 dirCkov                                                   )const;//tracing forward a photon from (x,y) to PC
  39   void     RecPhot      (TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer               );     //theta,phi cerenkov reconstructed
  40   void     SetTrack     (Double_t xRad,Double_t yRad,Double_t theta,Double_t phi            )
  41                                 {fTrkDir.SetMagThetaPhi(1,theta,phi);  fTrkPos.Set(xRad,yRad);}    //set track parameter at RAD
  42   void     SetImpPC     (Double_t xPc,Double_t yPc                                          )
  43                                 {fPc.Set(xPc,yPc);}                                                //set track impact to PC
  44   Double_t SigLoc       (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to cathode segmetation
  45   Double_t SigGeom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknown photon origin
  46   Double_t SigCrom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknonw photon energy
  47   Double_t Sigma2       (Double_t ckovTh,Double_t ckovPh                                    )const;//photon candidate sigma
  48   enum ETrackingFlags {kMipDistCut=-9,kMipQdcCut=-5,kNoPhotAccept=-11};
  49
  50   static const Double_t fgkRadThick;                      //radiator thickness
  51   static const Double_t fgkWinThick;                      //window thickness
  52   static const Double_t fgkGapThick;                      //proximity gap thickness
  53   static const Double_t fgkWinIdx;                        //mean refractive index of WIN material (SiO2)
  54   static const Double_t fgkGapIdx;                        //mean refractive index of GAP material (CH4)
  55 protected:
  56   Double_t fRadNmean;                          //C6F14 mean refractive index
  57   Int_t    fPhotCnt;                           // counter of photons candidate
  58   Int_t    fPhotFlag[3000];                    // flags of photon candidates
  59   Double_t fPhotCkov[3000];                    // Ckov angles of photon candidates, [rad]
  60   Double_t fPhotPhi [3000];                    // phis of photons candidates, [rad]
  61   Double_t fPhotWei [3000];                    // weigths of photon candidates
  62   Double_t fCkovSigma2;                        // sigma2 of the reconstructed ring
  63
  64   Bool_t  fIsWEIGHT;                          // flag to consider weight procedure
  65   Float_t fDTheta;                            // Step for sliding window
  66   Float_t fWindowWidth;                       // Hough width of sliding window
  67
  68   TVector3 fTrkDir;                           //track direction in LORS at RAD
  69   TVector2 fTrkPos;                           //track positon in LORS at RAD
  70   TVector2 fPc;                               //track position at PC
  71   ClassDef(AliHMPIDRecon,0)
  72 };
  73
  74 #endif // #ifdef AliHMPIDRecon_cxx
  75