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 class AliHMPIDParam;//general pourpose
  22
  23 class AliHMPIDRecon : public TTask
  24 {
  25 public :
  26              AliHMPIDRecon();
  27     virtual ~AliHMPIDRecon() {;} //dtor
  28
  29   void     InitVars     (Int_t n);                                                                 //init space for variables
  30   void     DeleteVars   ();                                                                        //delete variables
  31   void     CkovAngle    (AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean, Double_t qthre);  //reconstructed Theta Cerenkov
  32   Bool_t   FindPhotCkov (Double_t cluX,Double_t cluY,Double_t &thetaCer,Double_t &phiCer    );     //find ckov angle for single photon candidate
  33   Double_t FindRingCkov (Int_t iNclus                                                       );     //best ckov for ring formed by found photon candidates
  34   Double_t FindRingArea (Double_t ckovAng                                                   )const;//estimated area of delta ring in cm^2 to weight Hough Transform
  35   TVector2 IntWithEdge  (TVector2 p1,TVector2 p2                                            )const;//find intercection between plane and lines of 2 thetaC
  36   Int_t    FlagPhot     (Double_t ckov                                                      );     //is photon ckov near most probable track ckov
  37   Double_t HoughResponse(                                                                   );     //most probable track ckov angle
  38   void     Propagate    (const TVector3  dir,      TVector3 &pos,Double_t z                 )const;//propagate photon alogn the line
  39   void     Refract      (      TVector3 &dir,                    Double_t n1,    Double_t n2)const;//refract photon on the boundary
  40   TVector2 TracePhot    (Double_t ckovTh,Double_t ckovPh                                    )const;//trace photon created by track to PC
  41   TVector2 TraceForward (TVector3 dirCkov                                                   )const;//tracing forward a photon from (x,y) to PC
  42   void     RecPhot      (TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer               );     //theta,phi cerenkov reconstructed
  43   TVector2 GetMip       (                                                                   )
  44                         {return fMipPos;}                                                          //mip coordinates
  45   void     SetTrack     (Double_t xRad,Double_t yRad,Double_t theta,Double_t phi            )
  46                                 {fTrkDir.SetMagThetaPhi(1,theta,phi);  fTrkPos.Set(xRad,yRad);}    //set track parameter at RAD
  47   void     SetImpPC     (Double_t xPc,Double_t yPc                                          )
  48                                 {fPc.Set(xPc,yPc);}                                                //set track impact to PC
  49   void     SetMip       (Double_t xmip,Double_t ymip                                        )
  50                                 {fMipPos.Set(xmip,ymip);}                                          //set track impact to PC
  51   Double_t SigLoc       (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to cathode segmetation
  52   Double_t SigGeom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknown photon origin
  53   Double_t SigCrom      (Double_t ckovTh,Double_t ckovPh,Double_t beta                      )const;//error due to unknonw photon energy
  54   Double_t Sigma2       (Double_t ckovTh,Double_t ckovPh                                    )const;//photon candidate sigma^2
  55   enum ETrackingFlags {kMipDistCut=-9,kMipQdcCut=-5,kNoPhotAccept=-11};
  56 //
  57 protected:
  58   Int_t     fPhotCnt;                           // counter of photons candidate
  59   Int_t    *fPhotFlag;                          // flags of photon candidates
  60   Double_t *fPhotCkov;                          // Ckov angles of photon candidates, [rad]
  61   Double_t *fPhotPhi;                           // phis of photons candidates, [rad]
  62   Double_t *fPhotWei;                           // weigths of photon candidates
  63   Double_t  fCkovSigma2;                        // sigma2 of the reconstructed ring
  64
  65   Bool_t    fIsWEIGHT;                          // flag to consider weight procedure
  66   Float_t   fDTheta;                            // Step for sliding window
  67   Float_t   fWindowWidth;                       // Hough width of sliding window
  68
  69   TVector3  fTrkDir;                            //track direction in LORS at RAD
  70   TVector2  fTrkPos;                            //track positon in LORS at RAD
  71   TVector2  fMipPos;                            //mip positon for a given track
  72   TVector2  fPc;                                //track position at PC
  73
  74   AliHMPIDParam *fParam;                        //Pointer to AliHMPIDParam
  75 //
  76   ClassDef(AliHMPIDRecon,0)
  77 };
  78
  79 #endif // #ifdef AliHMPIDRecon_cxx
  80