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  1. //+
  2. // File : BParticle.cc
  3. // Description : Implementation of BTrack class //
  4. //-
  5.  
  6. #include "BParticle.h"
  7.  
  8. ClassImp (BParticle)
  9.  
  10.  
  11.  BParticle::BParticle ( float px, float py, float pz, float e,
  12.                        float charge, SIMPLEPID pid ) {
  13.    m_px = px;
  14.    m_py = py;
  15.    m_pz = pz;
  16.    m_e = e;
  17.    m_charge = charge;
  18.    m_pid = pid;
  19.  }
  20.  
  21.  
  22. float BParticle::GetMass(SIMPLEPID pid){
  23.  
  24. switch (pid){
  25.         case PHOTON:   return 0;
  26.         case ELECTRON: return 0.51;
  27.         case PION:     return 0.139;
  28.         case MUON:     return 0.105;
  29.         case KAON:     return 0.497;
  30.         case PROTON:   return 0.938;
  31.         case JPSI:     return 3.1;
  32.         case D:        return 1.86;
  33.         case DSTAR:    return 2.01;
  34.         case B:        return 5.27;
  35.         default: return 0;
  36. }      
  37.  
  38. }
  39.  
  40.  float BParticle::GetMass ()
  41.  {
  42.    float m2 = m_e * m_e-m_px * m_px-m_py * m_py-m_pz * m_pz;
  43.    if (m2<0) m2=0;
  44.    return sqrt(m2);
  45.  }  
  46.  
  47.  void BParticle::SetEnergyFromMass (float mass)
  48.  {
  49.    m_e = sqrt( mass * mass + m_px * m_px +m_py * m_py +m_pz * m_pz );
  50.    
  51.  }
  52.  
  53. void BParticle::SetEnergyFromPid(){
  54.         SetEnergyFromMass(GetMass(m_pid));
  55. }
  56.  
  57. int SelectParticles(TClonesArray *pin , int charge, SIMPLEPID type, TClonesArray *pout){
  58.   pout->Clear();
  59.   int nprt=0;
  60.  
  61.   for(TIter next(pin); BParticle * p =(BParticle *) next();) {
  62.         if (p->charge()== charge && p->pid()== type ) {
  63.           TClonesArray& list = *pout;
  64.           new (list[nprt++]) BParticle ( *p );
  65.         }
  66.   }      
  67.   return nprt;  
  68. }
  69.  
  70. int CombineParticles(TClonesArray *plist1 ,TClonesArray *plist2 , int same, float masslow, float massup, SIMPLEPID pid, TClonesArray *pout){
  71.  // Loop over all the particles in both lists.
  72.  pout->Clear();
  73.  int nprt=0;
  74.  
  75.  for(TIter next1(plist1);BParticle * p1 =(BParticle *) next1();) {
  76.     // the second loop
  77.    for( TIter next2 = (plist1!=plist2 && same==0) ?  TIter(plist2): TIter(next1) ; BParticle * p2 =(BParticle *) next2();) {  
  78.       BParticle  p = *p1 + *p2; // Combine two particles into a new particle  
  79.       if (p.InMassRange(masslow, massup)){
  80.             p.SetPid(pid);
  81.                 TClonesArray& list = *pout;
  82.             new (list[nprt++]) BParticle ( p ); // create a new entry in kslist list of particles
  83.       }
  84.        
  85.    }
  86.                
  87.  }
  88.  return nprt;
  89. }
  90.  
  91.  
  92.  
  93.