EvtBlattWeisskopf.hh

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/*******************************************************************************
 * Project: BaBar detector at the SLAC PEP-II B-factory
 * Package: EvtGenBase
 *    File: $Id: EvtBlattWeisskopf.hh,v 1.2 2015/07/01 12:28:24 pingrg Exp $
 *  Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
 *
 * Copyright (C) 2002 Caltech
 *******************************************************************************/
 
// Blatt-Weisskopf penetration form factor for a resonance R->AB.
// Taken from CLEO preprint 00-23 (hep-ex/0011065)
 
#ifndef EVT_BLATT_WEISSKOPF_HH
#define EVT_BLATT_WEISSKOPF_HH
 
class EvtBlattWeisskopf {
 
public:
  EvtBlattWeisskopf( int LL, double R, double p0 );
  EvtBlattWeisskopf( const EvtBlattWeisskopf& );
  ~EvtBlattWeisskopf();
 
  double operator()( double p ) const;
  double get( double p ) { return compute( p ); }
 
private:
  int    _LL;     // angular momentum of daughters
  double _radial; // resonance radial parameter
  double _p0;
 
  double _F0; // formula evaluated at _p0
  double compute( double p ) const;
};
 
#endif