#include "AliGenDoubleScan.h"
#include "AliRun.h"
ClassImp(AliGenDoubleScan)
AliGenDoubleScan::AliGenDoubleScan()
:AliGenScan(-1),
fDistance(0.)
{
}
AliGenDoubleScan::AliGenDoubleScan(Int_t npart)
:AliGenScan(npart),
fDistance(0.)
{
fName = "Double Scan";
fTitle= "Particle Generator for two correlated particles on a grid";
}
AliGenDoubleScan::~AliGenDoubleScan()
{
}
void AliGenDoubleScan::Generate()
{
Float_t polar[3]= {0,0,0};
Float_t origin[3];
Float_t p[3];
Int_t nt;
Float_t pmom, theta, phi;
Float_t random[6];
Float_t dx,dy,dz;
if (fNx > 0) {
dx=(fXCmax-fXCmin)/fNx;
} else {
dx=1e10;
}
if (fNy > 0) {
dy=(fYCmax-fYCmin)/fNy;
} else {
dy=1e10;
}
if (fNz > 0) {
dz=(fZmax-fZmin)/fNz;
} else {
dz=1e10;
}
for (Int_t ix=0; ix<fNx; ix++) {
for (Int_t iy=0; iy<fNy; iy++) {
for (Int_t iz=0; iz<fNz; iz++){
Rndm(random,6);
origin[0]=fXCmin+ix*dx+2*(random[0]-0.5)*fOsigma[0];
origin[1]=fYCmin+iy*dy+2*(random[1]-0.5)*fOsigma[1];
origin[2]=fZmin+iz*dz+2*(random[2]-0.5)*fOsigma[2];
pmom=fPMin+random[3]*(fPMax-fPMin);
theta=fThetaMin+random[4]*(fThetaMax-fThetaMin);
phi=fPhiMin+random[5]*(fPhiMax-fPhiMin);
p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
p[2] = pmom*TMath::Cos(theta);
PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
Rndm(random,6);
Float_t phi2=2.*TMath::Pi()*random[0];
Float_t dx2 =fDistance*TMath::Sin(phi2);
Float_t dy2 =fDistance*TMath::Cos(phi2);
origin[0]=origin[0]+dx2;
origin[1]=origin[1]+dy2;
pmom=fPMin+random[1]*(fPMax-fPMin);
theta=fThetaMin+random[2]*(fThetaMax-fThetaMin);
phi=fPhiMin+random[3]*(fPhiMax-fPhiMin);
p[0] = pmom*TMath::Cos(phi)*TMath::Sin(theta);
p[1] = pmom*TMath::Sin(phi)*TMath::Sin(theta);
p[2] = pmom*TMath::Cos(theta);
PushTrack(fTrackIt,-1,fIpart,p,origin,polar,0,kPPrimary,nt);
}
}
}
}