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   ()const;                                                                   //delete variables
  31   void     CkovAngle    (AliESDtrack *pTrk,TClonesArray *pCluLst,Int_t index,Double_t nmean,Float_t xRa,Float_t yRa );//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   void     FindRingGeom (Double_t ckovAng,Int_t level=1                                     );     //estimated area of ring in cm^2 and portion accepted by geometry
  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     Lors2Trs     (TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer               )const;//LORS to TRS
  43   void     Trs2Lors     (TVector3 dirCkov,Double_t &thetaCer,Double_t &phiCer               )const;//TRS to LORS
  44   TVector2 GetMip       (                                                                   )const
  45                         {return fMipPos;}                                                          //mip coordinates
  46   Double_t GetRingArea  (                                                                   )const
  47                         {return fRingArea;}                                                        //area of the current ring in cm^2
  48   Double_t GetRingAcc   (                                                                   )const
  49                         {return fRingAcc;}                                                         //portion of the ring ([0,1]) accepted by geometry.To scale n. of photons
  50   Double_t FindRingExt  (Double_t ckov,Double_t xPc,Double_t yPc,Double_t thRa,Double_t phRa);     //find ring acceptance by external parameters
  51   void     SetTrack     (Double_t xRad,Double_t yRad,Double_t theta,Double_t phi            )
  52                                 {fTrkDir.SetMagThetaPhi(1,theta,phi);  fTrkPos.Set(xRad,yRad);}    //set track parameter at RAD
  53   void     SetImpPC     (Double_t xPc,Double_t yPc                                          )
  54                                 {fPc.Set(xPc,yPc);}                                                //set track impact to PC
  55   void     SetMip       (Double_t xmip,Double_t ymip                                        )
  56                                 {fMipPos.Set(xmip,ymip);}                                          //set track impact to PC
  57   enum ETrackingFlags {kNotPerformed=-20,kMipDistCut=-9,kMipQdcCut=-5,kNoPhotAccept=-11,kNoRad = -22};
  58 //
  59 protected:
  60   Int_t     fPhotCnt;                           // counter of photons candidate
  61   Int_t    *fPhotFlag;                          // flags of photon candidates
  62   Double_t *fPhotCkov;                          // Ckov angles of photon candidates, [rad]
  63   Double_t *fPhotPhi;                           // phis of photons candidates, [rad]
  64   Double_t *fPhotWei;                           // weigths of photon candidates
  65   Double_t  fCkovSigma2;                        // sigma2 of the reconstructed ring
  66
  67   Bool_t    fIsWEIGHT;                          // flag to consider weight procedure
  68   Float_t   fDTheta;                            // Step for sliding window
  69   Float_t   fWindowWidth;                       // Hough width of sliding window
  70
  71   Double_t  fRingArea;                          // area of a given ring
  72   Double_t  fRingAcc;                           // fraction of the ring accepted by geometry
  73   TVector3  fTrkDir;                            // track direction in LORS at RAD
  74   TVector2  fTrkPos;                            // track positon in LORS at RAD
  75   TVector2  fMipPos;                            // mip positon for a given track
  76   TVector2  fPc;                                // track position at PC
  77
  78   AliHMPIDParam *fParam;                        // Pointer to AliHMPIDParam
  79
  80 private:
  81   AliHMPIDRecon(const AliHMPIDRecon& r);              //dummy copy constructor
  82   AliHMPIDRecon &operator=(const AliHMPIDRecon& r);   //dummy assignment operator
  83 //
  84   ClassDef(AliHMPIDRecon,1)
  85 };
  86
  87 #endif // #ifdef AliHMPIDRecon_cxx
  88