LauRelBreitWignerRes.hh

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// Copyright University of Warwick 2004 - 2013.
// Distributed under the Boost Software License, Version 1.0.
// (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

// Authors:
// Thomas Latham
// John Back
// Paul Harrison

#ifndef LAU_REL_BREIT_WIGNER_RES
#define LAU_REL_BREIT_WIGNER_RES

#include "TString.h"

#include "LauAbsResonance.hh"
#include "LauComplex.hh"


class LauRelBreitWignerRes : public LauAbsResonance {

        public:

                LauRelBreitWignerRes(TString resName, Double_t resMass, Double_t resWidth,
                                Int_t resSpin, Int_t resCharge, Int_t resPairAmpInt, 
                                const LauDaughters* daughters);

                virtual ~LauRelBreitWignerRes();

                virtual void initialise();


                virtual LauAbsResonance::LauResonanceModel getResonanceModel() const {return LauAbsResonance::RelBW;}


                virtual void setBarrierRadii(const Double_t resRadius, const Double_t parRadius, const LauAbsResonance::BarrierType type);

        protected:

                virtual LauComplex resAmp(Double_t mass, Double_t spinTerm);


                Double_t calcFFactor(Double_t z);


        private:
                Double_t q0_;
                Double_t p0_;
                Double_t pstar0_;
                Double_t resMassSq_;
                Double_t mDaugSum_;
                Double_t mDaugSumSq_;
                Double_t mDaugDiff_;
                Double_t mDaugDiffSq_;
                Double_t mParentSq_;
                Double_t mBachSq_;

                Double_t FR0_;
                Double_t FB0_;

                ClassDef(LauRelBreitWignerRes,0) // Relativistic Breit-Wigner resonance model

};

#endif