include/EvtGenModels/EvtSVP.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 EvtSVP_HH
0022 #define EvtSVP_HH
0023
0024 #include "EvtGenBase/EvtDecayAmp.hh"
0025
0026 #include <string>
0027
0028 class EvtParticle;
0029 class EvtDecayBase;
0030
0031 // Description: Routine to implement radiative decay
0032 //                   chi_c0 -> psi gamma
0033 //                   chi_c0 -> psi ell ell
0034
0035 class EvtSVP : public EvtDecayAmp {
0036   public:
0037     std::string getName() override;
0038     EvtDecayBase* clone() override;
0039
0040     void decay( EvtParticle* p ) override;
0041     void init() override;
0042
0043     void initProbMax() override;
0044
0045   private:
0046     void decay_2body( EvtParticle* p );
0047     void decay_3body( EvtParticle* p );
0048     double delta;    // form factor parameter
0049 };
0050
0051 #endif