include/EvtGenBase/EvtPropagator.hh

0001
0002 /***********************************************************************
0003 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
0004 *                                                                      *
0005 * This file is part of EvtGen.                                         *
0006 *                                                                      *
0007 * EvtGen is free software: you can redistribute it and/or modify       *
0008 * it under the terms of the GNU General Public License as published by *
0009 * the Free Software Foundation, either version 3 of the License, or    *
0010 * (at your option) any later version.                                  *
0011 *                                                                      *
0012 * EvtGen is distributed in the hope that it will be useful,            *
0013 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
0014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
0015 * GNU General Public License for more details.                         *
0016 *                                                                      *
0017 * You should have received a copy of the GNU General Public License    *
0018 * along with EvtGen.  If not, see <https://www.gnu.org/licenses/>.     *
0019 ***********************************************************************/
0020
0021 #ifndef EVT_PROPAGATOR_HH
0022 #define EVT_PROPAGATOR_HH
0023
0024 #include "EvtGenBase/EvtAmplitude.hh"
0025 #include "EvtGenBase/EvtComplex.hh"
0026 #include "EvtGenBase/EvtPoint1D.hh"
0027
0028 #include <assert.h>
0029
0030 // Defines propagator as a function of mass and width
0031
0032 class EvtPropagator : public EvtAmplitude<EvtPoint1D> {
0033   public:
0034     EvtPropagator( double m0, double g0 ) : _m0( m0 ), _g0( g0 )
0035     {
0036         assert( m0 > 0 );
0037         assert( g0 >= 0 );
0038     }
0039
0040     // Accessors
0041
0042     inline double m0() const { return _m0; }
0043     inline double g0() const { return _g0; }
0044
0045     // Modifiers (can be useful e.g. for fitting!)
0046
0047     inline void set_m0( double m0 )
0048     {
0049         assert( m0 > 0 );
0050         _m0 = m0;
0051     }
0052     inline void set_g0( double g0 )
0053     {
0054         assert( g0 >= 0 );
0055         _g0 = g0;
0056     }
0057
0058   protected:
0059     double _m0;
0060     double _g0;
0061 };
0062
0063 #endif