EvtBlattWeisskopf.hh

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#ifndef EVT_BLATT_WEISSKOPF_HH
#define EVT_BLATT_WEISSKOPF_HH
 
// Blatt-Weisskopf penetration form factor for a resonance R->AB.
// Taken from CLEO preprint 00-23 (hep-ex/0011065)
 
class EvtBlattWeisskopf {
  public:
    EvtBlattWeisskopf( int LL, double R, double p0 );
    EvtBlattWeisskopf( const EvtBlattWeisskopf& );
 
    double operator()( double p ) const;
 
  private:
    int m_LL;           // angular momentum of daughters
    double m_radial;    // resonance radial parameter
    double m_p0;
 
    double m_F0;    // formula evaluated at m_p0
    double compute( double p ) const;
};
 
#endif