3 /* Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * See cxx source for full Copyright notice */
6 // HMPID base class to produce hits
9 #include <AliHit.h> //base class
10 #include <TVector3.h> //ctor
11 #include "AliHMPIDDigit.h" //QdcTot()
15 class AliHMPIDHit : public AliHit // TObject-AliHit-AliHMPIDHit
18 AliHMPIDHit( ):AliHit( ),fCh(-1),fPid(-1 ),fQ(-1),fLx(0),fLy(0){} //default ctor
19 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();}
20 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
21 AliHMPIDHit(const AliHMPIDHit &h):AliHit(h),fCh(h.fCh),fPid(h.fPid),fQ(h.fQ),fLx(h.fLx),fLy(h.fLy) {}//copy ctor
22 virtual ~AliHMPIDHit() {}
24 void Print(Option_t *opt="")const; //from TObject to print current status
25 void Draw (Option_t *opt=""); //from TObject to Draw this hit
27 Int_t Ch ( )const{return fCh; } //Chamber
28 void Hit2Sdi(TClonesArray *pSdiLst,Int_t n=1)const; //add sdigits of this hit to the list
29 Float_t LorsX ( )const{return fLx; } //hit X position in LORS, [cm]
30 Float_t LorsY ( )const{return fLy; } //hit Y position in LORS, [cm]
31 Int_t Pid ( )const{return fPid; } //PID
32 Float_t Q ( )const{return fQ; } //total charge, [QDC]
33 inline Float_t QdcTot (Float_t e ); //calculate total charge of the hit
34 Int_t Tid ( )const{return fTrack; } //TID
35 void SetQ (Float_t q ) {fQ=q; } //for debugging...
36 protected: //AliHit has fTrack,fX,fY,fZ
39 Float_t fQ; //total charge [QDC]
40 Float_t fLx; //hit X position in chamber LORS, [cm]
41 Float_t fLy; //hit Y position in chamber LORS, [cm]
42 ClassDef(AliHMPIDHit,5) //HMPID hit class
44 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
45 Float_t AliHMPIDHit::QdcTot(Float_t e)
47 // Samples total charge of the hit
48 // Arguments: e- hit energy [GeV] for mip Eloss for photon Etot
51 AliHMPIDParam::Lors2Pad(fLx,fLy,pc,px,py);
54 Float_t y=AliHMPIDParam::LorsY(pc,py);
55 fLy=((y-fLy)>0)?y-0.2:y+0.2; //shift to the nearest anod wire
57 Float_t x=(fLx > 66.6)? fLx-66.6:fLx; //sagita is for PC (0-64) and not for chamber
58 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
60 Int_t iNele=Int_t(e/26e-9); if(iNele<1) iNele = 1; //number of electrons created by hit, if photon e=0 implies iNele=1
62 for(Int_t i=1;i<=iNele;i++){
63 Double_t rnd=gRandom->Rndm(); if(rnd==0) rnd=1e-12; //1e-12 is a protection against 0 from rndm
64 fQ-=qdcEle*TMath::Log(rnd);
69 //++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++