EvtVubdGamma.hh

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//-----------------------------------------------------------------------
// File and Version Information:
//
// Copyright Information: See EvtGen/COPYRIGHT
//
//
// Description:
//    3                                         2                2
//   d Gamma                 /   _      _ _2  mb           _2  mb
//  ---------- = 12 Gamma   | (1+x-z)(z-x-p ) -- W  + (1-z+p ) -- W
//         _ 2           0   \                 2  1             2  2
//  dx dz dp                                   2
//                                _   _  _2  mb                 2   \ 
//                             + [x(z-x)-p ] -- (W + 2mb W  + mb W ) |
//                                            4   3       4       5 /
//
//   with
//        2 E           2
//           l    _2   p        2 v.p    _
//   x = ------ , p = --- , z = ------ , x = 1-x
//         mb           2         mb
//                    mb
//
//   the triple differential decay rate according to
//   hep-ph/9905351 v2
//
// Environment:
//      Software developed for the BaBar Detector at the SLAC B-Factory.
//
// Author List:
//      Sven Menke
//
//-----------------------------------------------------------------------
 
#ifndef EVTVUBDGAMMA_HH
#define EVTVUBDGAMMA_HH
 
class EvtVubdGamma {
 
public:
  // Constructors
 
  EvtVubdGamma( const double& alphas );
 
  // Destructor
 
  virtual ~EvtVubdGamma();
 
  // Operators
 
  // Selectors
 
  // Modifiers
 
  // Methods
 
  double getdGdxdzdp( const double& x, const double& z, const double& p2 );
 
protected:
  // Helper functions
 
  double delta( const double& x, const double& xmin, const double& xmax );
 
  double getW1nodelta( const double& x, const double& z, const double& p2 );
 
  double getW2nodelta( const double& x, const double& z, const double& p2 );
 
  double getW3nodelta( const double& x, const double& z, const double& p2 );
 
  double getW4nodelta( const double& x, const double& z, const double& p2 );
 
  double getW5nodelta( const double& x, const double& z, const double& p2 );
 
  double getW1delta( const double& x, const double& z );
 
  double getW4plus5delta( const double& x, const double& z );
 
private:
  // Friends
 
  // Data members
 
  double _alphas;
  double _epsilon1;
  double _epsilon2;
  double _epsilon3;
};
 
#endif // EVTVUBDGAMMA_HH