EvtBlattWeisskopf.hh
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EvtBlattWeisskopf.hh
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	/***********************************************************************
	* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
	* *
	* This file is part of EvtGen. *
	* *
	* EvtGen is free software: you can redistribute it and/or modify *
	* it under the terms of the GNU General Public License as published by *
	* the Free Software Foundation, either version 3 of the License, or *
	* (at your option) any later version. *
	* *
	* EvtGen is distributed in the hope that it will be useful, *
	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
	* GNU General Public License for more details. *
	* *
	* You should have received a copy of the GNU General Public License *
	* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
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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 _LL; // angular momentum of daughters
	double _radial; // resonance radial parameter
	double _p0;

	double _F0; // formula evaluated at _p0
	double compute( double p ) const;
	};

	#endif