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                            );                           //reconstructed Theta Cerenkov
  30   Double_t FindPhotCkov (Double_t cluX,Double_t cluY                                        );     //find ckov angle for single photon candidate
  31   Double_t FindPhotPhi  (Double_t cluX,Double_t cluY                                        );     //find phi angle for single photon candidate
  32   Double_t FindRingCkov (Int_t iNclus                                                       );     //best ckov for ring formed by found photon candidates
  33   Double_t FindRingArea (Double_t ckov                                                      )const;//estimated area of ring in cm^2
  34   Int_t    FlagPhot     (Double_t ckov                                                      );     //is photon ckov near most probable track ckov
  35   Double_t HoughResponse(                                                                   );     //most probable track ckov angle
  36   void     Propagate    (const TVector3 &dir,      TVector3 &pos,Double_t z                 )const;//propagate photon alogn the line
  37   void     Refract      (      TVector3 &dir,                    Double_t n1,    Double_t n2)const;//refract photon on the boundary
  38   Double_t TracePhot    (Double_t ckovTh,Double_t ckovPh,TVector2 &pos                      )const;//trace photon created by track to PC
  39   void     SetTrack     (Double_t x,Double_t y,Double_t th,Double_t ph                      ){fTrkDir.SetMagThetaPhi(1,th,ph);  fTrkPos.Set(x,y);}//set track
  40   Double_t SigLoc       (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to cathode segmetation
  41   Double_t SigGeom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknown photon origin
  42   Double_t SigCrom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknonw photon energy
  43   Double_t Sigma2       (Double_t ckovTh,Double_t ckovPh                                    )const;//photon candidate sigma
  44   enum ETrackingFlags {kMipDistCut=-9,kMipQdcCut=-5,kNoPhotAccept=-11};
  45 protected:
  46   static const Double_t fgkRadThick;                      //radiator thickness
  47   static const Double_t fgkWinThick;                      //window thickness
  48   static const Double_t fgkGapThick;                      //proximity gap thickness
  49   static const Double_t fgkRadIdx;                        //mean refractive index of RAD material (C6F14)
  50   static const Double_t fgkWinIdx;                        //mean refractive index of WIN material (SiO2)
  51   static const Double_t fgkGapIdx;                        //mean refractive index of GAP material (CH4)
  52   Int_t    fPhotCnt;                           // counter of photons candidate
  53   Int_t    fPhotFlag[3000];                    // flags of photon candidates
  54   Double_t fPhotCkov[3000];                    // Ckov angles of photon candidates, [rad]
  55   Double_t fPhotPhi [3000];                    // phis of photons candidates, [rad]
  56   Double_t fPhotWei [3000];                    // weigths of photon candidates
  57   Double_t fCkovSigma2;                        // sigma2 of the reconstructed ring
  58
  59   Bool_t  fIsWEIGHT;                          // flag to consider weight procedure
  60   Float_t fDTheta;                            // Step for sliding window
  61   Float_t fWindowWidth;                       // Hough width of sliding window
  62
  63   TVector3 fTrkDir;                           //track direction in LORS
  64   TVector2 fTrkPos;                           //track positon in LORS at the middle of radiator
  65   ClassDef(AliHMPIDRecon,0)
  66 };
  67
  68 typedef AliHMPIDRecon AliRICHRecon; // for backward compatibility
  69
  70 #endif // #ifdef AliHMPIDRecon_cxx
  71