EvtTwoBodyKine.hh

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/*******************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenBase
 *    File: $Id: EvtTwoBodyKine.hh,v 1.1.1.2 2007/10/26 05:03:14 pingrg Exp $
 *  Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
 *
 * Copyright (C) 2002 Caltech
 *******************************************************************************/
 
// Descriptions of the kinematics of a two-body decay.
 
#ifndef EVT_TWO_BODY_KINE_HH
#define EVT_TWO_BODY_KINE_HH
 
#include <iostream>
 
class EvtTwoBodyKine {
 
public:
  enum Index { A, B, AB };
 
  EvtTwoBodyKine();
  EvtTwoBodyKine( double mA, double mB, double mAB );
  EvtTwoBodyKine( const EvtTwoBodyKine& other );
  ~EvtTwoBodyKine();
 
  // Accessors
 
  inline double mA() const { return _mA; }
  inline double mB() const { return _mB; }
  inline double mAB() const { return _mAB; }
  double        m( Index i ) const;
 
  // Momentum of the other two particles in the
  // rest-frame of particle i.
 
  double p( Index i = AB ) const;
 
  // Energy of particle i in the rest frame of particle j
 
  double e( Index i, Index j ) const;
 
  void print( std::ostream& os ) const;
 
private:
  double _mA;
  double _mB;
  double _mAB;
};
 
std::ostream& operator<<( std::ostream& os, const EvtTwoBodyKine& p );
 
#endif