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/*******************************************************************************
* Project: BaBar detector at the SLAC PEP-II B-factory
* Package: EvtGenBase
* File: $Id: EvtDalitzResPdf.hh,v 1.2 2009-03-16 16:42:46 robbep Exp $
* Author: Alexei Dvoretskii, dvoretsk@slac.stanford.edu, 2001-2002
*
* Copyright (C) 2002 Caltech
*******************************************************************************/
/*
* Pole compensating function for terms that exibit a resonant structure
* in one dimension only.
*
* f = 1 g*m0
* -- ------------------
* pi (q-q0)^2 + g^2m0^2
*
* m is the mass of the resonance, g is its width. The approximation works well for a narrow
* resonance. It is also readily integrable over the Dalitz plot coordinate to produce
*
* Int = 1/pi atan((q-q0)/(g*m0))
*/
#ifndef EVT_DALITZ_RES_PDF_HH
#define EVT_DALITZ_RES_PDF_HH
#include "EvtGenBase/EvtPdf.hh"
#include "EvtGenBase/EvtDalitzPoint.hh"
#include "EvtGenBase/EvtCyclic3.hh"
class EvtDalitzResPdf : public EvtPdf<EvtDalitzPoint> {
public:
EvtDalitzResPdf(const EvtDalitzPlot& dp,double m0, double g0, EvtCyclic3::Pair pairRes);
EvtDalitzResPdf(const EvtDalitzResPdf& other);
virtual ~EvtDalitzResPdf();
EvtPdf<EvtDalitzPoint>* clone() const { return new EvtDalitzResPdf(*this); }
virtual EvtValError compute_integral(int N) const;
virtual EvtDalitzPoint randomPoint();
double pdfMaxValue() const;
protected:
virtual double pdf(const EvtDalitzPoint&) const;
private:
EvtDalitzPlot _dp;
double _m0; // mass
double _g0; // width
EvtCyclic3::Pair _pair; // resonant pair
};
#endif

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