3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 #include <AliHit.h> //base class
7 #include <TVector3.h> //ctor
8 #include <TRandom.h> //QdcTot()
9 #include "AliHMPIDDigit.h" //QdcTot()
11 class AliHMPIDHit : public AliHit // TObject-AliHit-AliHMPIDHit
14 AliHMPIDHit( ):AliHit( ),fCh(-1),fPid(-1 ),fQ(-1),fLx(0),fLy(0){} //default ctor
15 AliHMPIDHit(Int_t c,Float_t &e,Int_t pid,Int_t tid,Float_t x,Float_t y,const TVector3 &p):AliHit(0,tid),fCh(c ),fPid(pid),fQ(0 ),fLx(x),fLy(y){e=QdcTot(e);fX=p.X();fY=p.Y();fZ=p.Z();}
16 AliHMPIDHit(Int_t c,Float_t &e,Int_t pid,Int_t tid,Float_t x,Float_t y ):AliHit( ),fCh(c ),fPid(pid),fQ(0 ),fLx(x),fLy(y){e=QdcTot(e);fTrack=tid;}//manual ctor
17 AliHMPIDHit(const AliHMPIDHit &h):AliHit(h),fCh(h.fCh),fPid(h.fPid),fQ(h.fQ),fLx(h.fLx),fLy(h.fLy) {}//copy ctor
18 virtual ~AliHMPIDHit() {}
20 void Print(Option_t *opt="")const; //from TObject to print current status
21 void Draw (Option_t *opt=""); //from TObject to Draw this hit
23 Int_t Ch ( )const{return fCh; } //Chamber
24 void Hit2Sdi(TClonesArray *pSdiLst,Int_t n=1)const; //add sdigits of this hit to the list
25 Float_t LorsX ( )const{return fLx; } //hit X position in LORS, [cm]
26 Float_t LorsY ( )const{return fLy; } //hit Y position in LORS, [cm]
27 Int_t Pid ( )const{return fPid; } //PID
28 Float_t Q ( )const{return fQ; } //total charge, [QDC]
29 inline Float_t QdcTot (Float_t e ); //calculate total charge of the hit
30 Int_t Tid ( )const{return fTrack; } //TID
31 void SetQ (Float_t q ) {fQ=q; } //for debugging...
32 protected: //AliHit has fTrack,fX,fY,fZ
35 Float_t fQ; //total charge [QDC]
36 Float_t fLx; //hit X position in chamber LORS, [cm]
37 Float_t fLy; //hit Y position in chamber LORS, [cm]
38 ClassDef(AliHMPIDHit,5) //HMPID hit class
40 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
41 Float_t AliHMPIDHit::QdcTot(Float_t e)
43 // Samples total charge of the hit
44 // Arguments: e- hit energy [GeV] for mip Eloss for photon Etot
47 AliHMPIDDigit::Lors2Pad(fLx,fLy,pc,px,py);
48 Float_t y=AliHMPIDDigit::LorsY(pc,py);
49 fLy=((y-fLy)>0)?y-0.2:y+0.2; //shift to the nearest anod wire
51 Float_t x=(fLx > 66.6)? fLx-66.6:fLx; //sagita is for PC (0-64) and not for chamber
52 Float_t qdcEle=34.06311+0.2337070*x+5.807476e-3*x*x-2.956471e-04*x*x*x+2.310001e-06*x*x*x*x; //reparametrised from DiMauro
54 Int_t iNele=Int_t(e/26e-9); if(iNele<1) iNele=1; //number of electrons created by hit
56 for(Int_t i=1;i<=iNele;i++){
57 Double_t rnd=gRandom->Rndm(); if(rnd==0) rnd=1e-12; //1e-12 is a protection against 0 from rndm
58 fQ-=qdcEle*TMath::Log(rnd);
62 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++