StL3Nuclei.cxx

#include "StL3Nuclei.h"
#include "StL3RareTrack.h"
#include "StEventTypes.h"
#include <stdlib.h>

ClassImp(StL3Nuclei)

StL3Nuclei::StL3Nuclei(float plow, float phigh, int charge, int mass)
{
  pcut[0]    = plow;
  pcut[1]    = phigh;
  chargeToAccept = charge;
  minMass    = mass;  
}

int StL3Nuclei::Accept(StGlobalTrack* trk)
{
  int iret = 0;
  int chargeOK = 0;
  int dedxOK = 0;
  int pOK=0;
  StL3RareTrack track(trk);
  if (chargeToAccept==0) 
        chargeOK = 1;
  else if (chargeToAccept<0 && track.chargesign()<0) 
        chargeOK = 1;
  else if (chargeToAccept>0 && track.chargesign()>0)
        chargeOK = 1;

  float dedxmin;
  int theCharge = 1;
  if (abs(chargeToAccept)>1)
        theCharge = 2;
  float dedxExp = track.dedxExpected(minMass*0.939, theCharge); 
  dedxmin = 0.6 * dedxExp; // within 40%
  float dedx = track.dedx();
 
  //now I want to elimate tracks that are too close to more common particles.
  float dedxbad;
  if (minMass>1)
        dedxbad = 1.1 * track.dedxExpected((minMass-1)*0.939, theCharge);
  if (minMass==1)
        dedxbad = 1.1 * track.dedxExpected(0.494, 1); //not kaon
  if (dedx>dedxmin && dedx>dedxbad) 
        dedxOK = 1;

  // now select random tracks
  float random_number = (float)rand()/(float)RAND_MAX;
  //  cout << "random number = " << random_number << endl;
  if (random_number<0.005)
        dedxOK = 1;

  if (track.p()>pcut[0] && track.p()<pcut[1] && track.npntfit()>20) pOK = 1;

  iret = chargeOK*dedxOK*pOK;
  return iret;
}
void StL3Nuclei::Report(){
  cout << "StL3Nuclei: charge = " << chargeToAccept << endl; 
  cout << "StL3Nuclei: mass >= " << minMass << endl; 
  cout << "StL3Nuclei: momentum > " << pcut << endl;
}