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 // HTA hidden track algorithm
  50   Int_t    CkovHiddenTrk    (AliESDtrack *pTrk,TClonesArray *pCluLst,Double_t nmean);              //Pattern recognition without trackinf information
  51   void     CluPreFilter     (                                    );                                //Pre clustering filter to cut bkg clusters
  52   Bool_t   DoRecHiddenTrk   (                                    );                                //Calling to the fitted procedures
  53   Bool_t   FitEllipse       (Double_t &phiRec                    );                                //Fit clusters with a conical section (kTRUE only for ellipses)
  54   Bool_t   FitFree          (Double_t phiRec                     );                                //Fit (th,ph) of the track and ckovFit as result
  55   Double_t FunConSect       (Double_t *c,Double_t x,Double_t y   );                                //Function of a general conical section
  56   void     SetCkovFit       (Double_t ckov                       ) {fCkovFit=ckov;}                //Setter for ckof fitted
  57   void     SetTrkFit        (Double_t th,Double_t ph             ) {fThTrkFit = th;fPhTrkFit = ph;}//Setter for (th,ph) of the track
  58   void     SetRadXY         (Double_t  x,Double_t y              ) {fRadX = x;fRadY = y;}          //Setter for (th,ph) of the track
  59   static void     FunMinEl  (Int_t&/* */,Double_t* /* */,Double_t &f,Double_t *par,Int_t /* */);   //Fit function to find ellipes parameters
  60   static void     FunMinPhot(Int_t&/* */,Double_t* /* */,Double_t &f,Double_t *par,Int_t iflag);   //Fit function to minimize thetaCer RMS/Sqrt(n) of n clusters
  61   Int_t    IdxMip       ()const {return fIdxMip;}                                                  //Getter index of MIP
  62   Double_t MipX         ()const {return fMipX;}                                                    //Getter of x MIP in LORS
  63   Double_t MipY         ()const {return fMipY;}                                                    //Getter of y MIP in LORS
  64   Double_t MipQ         ()const {return fMipQ;}                                                    //Getter of Q MIP
  65   Double_t RadX         ()const {return fRadX;}                                                    //Getter of x at RAD in LORS
  66   Double_t RadY         ()const {return fRadY;}                                                    //Getter of y at RAD in LORS
  67   Int_t    NClu         ()const {return fNClu;}                                                    //Getter of cluster multiplicity
  68   Double_t XClu         (Int_t i)const {return fXClu[i];}                                          //Getter of x clu
  69   Double_t YClu         (Int_t i)const {return fYClu[i];}                                          //Getter of y clu
  70   Double_t CkovFit      ()const {return fCkovFit;}                                                 //Getter of ckov angle fitted
  71   Double_t ThTrkFit     ()const {return fThTrkFit;}                                                //Getter of theta fitted of the track
  72   Double_t PhTrkFit     ()const {return fPhTrkFit;}                                                //Getter of phi fitted of the track
  73 //
  74 protected:
  75   Double_t fRadNmean;                          //C6F14 mean refractive index
  76   Int_t    fPhotCnt;                           // counter of photons candidate
  77   Int_t    fPhotFlag[3000];                    // flags of photon candidates
  78   Double_t fPhotCkov[3000];                    // Ckov angles of photon candidates, [rad]
  79   Double_t fPhotPhi [3000];                    // phis of photons candidates, [rad]
  80   Double_t fPhotWei [3000];                    // weigths of photon candidates
  81   Double_t fCkovSigma2;                        // sigma2 of the reconstructed ring
  82
  83   Bool_t   fIsWEIGHT;                          // flag to consider weight procedure
  84   Float_t  fDTheta;                            // Step for sliding window
  85   Float_t  fWindowWidth;                       // Hough width of sliding window
  86
  87   TVector3 fTrkDir;                            //track direction in LORS at RAD
  88   TVector2 fTrkPos;                            //track positon in LORS at RAD
  89   TVector2 fPc;                                //track position at PC
  90 // HTA hidden track algorithm
  91   Double_t fMipX;                              //mip X position for Hidden Track Algorithm
  92   Double_t fMipY;                              //mip Y position for Hidden Track Algorithm
  93   Double_t fMipQ;                              //mip Q          for Hidden Track Algorithm
  94   Double_t fRadX;                              //rad X position for Hidden Track Algorithm
  95   Double_t fRadY;                              //rad Y position for Hidden Track Algorithm
  96   Int_t    fIdxMip;                            //mip index in the clus list
  97   Int_t    fNClu;                              //n clusters to fit
  98   Double_t fXClu[1000];                        //container for x clus position
  99   Double_t fYClu[1000];                        //container for y clus position
 100   Double_t fThTrkFit;                          //theta fitted of the track
 101   Double_t fPhTrkFit;                          //phi   fitted of the track
 102   Double_t fCkovFit;                           //estimated ring Cherenkov angle
 103 //
 104 private:
 105   static const Double_t fgkRadThick;                      //radiator thickness
 106   static const Double_t fgkWinThick;                      //window thickness
 107   static const Double_t fgkGapThick;                      //proximity gap thickness
 108   static const Double_t fgkWinIdx;                        //mean refractive index of WIN material (SiO2)
 109   static const Double_t fgkGapIdx;                        //mean refractive index of GAP material (CH4)
 110
 111   ClassDef(AliHMPIDRecon,0)
 112 };
 113
 114 #endif // #ifdef AliHMPIDRecon_cxx
 115