EvtTwoBodyVertex.hh
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EvtTwoBodyVertex.hh
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	/*******************************************************************************
	* Project: BaBar detector at the SLAC PEP-II B-factory
	* Package: EvtGenBase
	* File: $Id: EvtTwoBodyVertex.hh,v 1.2 2009-03-16 16:34:38 robbep Exp $
	* Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
	*
	* Copyright (C) 2002 Caltech
	*******************************************************************************/

	// Two-body propagator vertex AB->A,B with an attached Blatt-Weisskopf form factor.

	#ifndef EVT_TWO_BODY_VERTEX_HH
	#define EVT_TWO_BODY_VERTEX_HH

	#include <iostream>
	#include "EvtGenBase/EvtTwoBodyKine.hh"
	#include "EvtGenBase/EvtBlattWeisskopf.hh"

	#include <iosfwd>

	class EvtTwoBodyVertex {

	public:

	EvtTwoBodyVertex();
	EvtTwoBodyVertex(double mA, double mB, double mAB, int L);
	EvtTwoBodyVertex(const EvtTwoBodyVertex& other);
	~EvtTwoBodyVertex();

	double widthFactor(EvtTwoBodyKine x) const;
	double formFactor(EvtTwoBodyKine x) const;
	double phaseSpaceFactor(EvtTwoBodyKine x, EvtTwoBodyKine::Index) const;

	inline int L() const { return _LL; }
	inline double mA() const { return _kine.mA(); }
	inline double mB() const { return _kine.mB(); }
	inline double mAB() const { return _kine.mAB(); }
	inline double pD() const { return _p0; }
	void print(std::ostream& os) const;

	void set_f(double R);

	private:

	EvtTwoBodyKine _kine;
	int _LL;
	double _p0;
	EvtBlattWeisskopf* _f; // optional Blatt-Weisskopf form factor

	};

	std::ostream& operator<<(std::ostream& os, const EvtTwoBodyVertex& v);

	#endif