include/EvtGenModels/EvtXPsiGamma.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 EVTXPSIGAMMA_HH
0022 #define EVTXPSIGAMMA_HH
0023
0024 #include "EvtGenBase/EvtDecayAmp.hh"
0025 #include "EvtGenBase/EvtId.hh"
0026
0027 #include <fstream>
0028 #include <stdio.h>
0029
0030 class EvtComplex;
0031 class EvtParticle;
0032 class EvtTensor4C;
0033 class EvtVector4C;
0034 class EvtVector4R;
0035
0036 // Description:Implementation of the X3872(2-+) -> J/psi gamma decay
0037 // Description: Routine to implement radiative decay X3872(2-+) -> J/psi gamma
0038 //      according to [F. Brazzi et al, arXiv:1103.3155
0039
0040 class EvtXPsiGamma : public EvtDecayAmp {
0041   public:
0042     std::string getName() override;
0043     EvtDecayBase* clone() override;
0044
0045     void decay( EvtParticle* p ) override;
0046     void init() override;
0047
0048     void initProbMax() override;
0049
0050   private:
0051     //  int whichfit;
0052     EvtComplex fT2( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
0053                     EvtVector4C epsEps, EvtVector4C epsEta );
0054     EvtComplex fT3( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
0055                     EvtVector4C epsEps, EvtVector4C epsEta );
0056     EvtId _ID0;
0057     int ncall;
0058 };
0059
0060 #endif