include/EvtGenBase/EvtPropFlatte.hh

0001
0002 /***********************************************************************
0003 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
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0020
0021 #ifndef EVT_PROP_FLATTE_HH
0022 #define EVT_PROP_FLATTE_HH
0023
0024 #include "EvtGenBase/EvtComplex.hh"
0025 #include "EvtGenBase/EvtPropagator.hh"
0026
0027 // Flatte propagator: S.M.Flatte, Phys. Lett. B63, 224 (1976)
0028
0029 class EvtPropFlatte : public EvtPropagator {
0030   public:
0031     EvtPropFlatte( double m0, double g0, double m0a, double m0b, double g1,
0032                    double m1a, double m1b );
0033
0034     EvtAmplitude<EvtPoint1D>* clone() const override;
0035
0036   protected:
0037     EvtComplex amplitude( const EvtPoint1D& x ) const override;
0038
0039     double _m0a;
0040     double _m0b;
0041
0042     double _g1;
0043     double _m1a;
0044     double _m1b;
0045 };
0046
0047 #endif