include/EvtGenBase/EvtVectorParticle.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 EVTVECTORPARTICLE_HH
0022 #define EVTVECTORPARTICLE_HH
0023
0024 #include "EvtGenBase/EvtParticle.hh"
0025 #include "EvtGenBase/EvtVector4C.hh"
0026 #include "EvtGenBase/EvtVector4R.hh"
0027
0028 class EvtId;
0029
0030 class EvtVectorParticle : public EvtParticle {
0031   public:
0032     EvtVectorParticle() = default;
0033
0034     void init( EvtId part_n, double e, double px, double py, double pz );
0035     void init( EvtId part_n, const EvtVector4R& p ) override;
0036     void init( EvtId part_n, const EvtVector4R& p, const EvtVector4C&,
0037                const EvtVector4C&, const EvtVector4C& );
0038     EvtVector4C epsParent( int i ) const override
0039     {
0040         return boostTo( _eps[i], this->getP4() );
0041     }
0042     EvtVector4C eps( int i ) const override { return _eps[i]; }
0043     EvtSpinDensity rotateToHelicityBasis() const override;
0044     EvtSpinDensity rotateToHelicityBasis( double alpha, double beta,
0045                                           double gamma ) const override;
0046
0047   private:
0048     EvtVector4C _eps[3];
0049
0050     EvtVectorParticle( const EvtVectorParticle& vector );
0051     EvtVectorParticle& operator=( const EvtVectorParticle& vector );
0052 };
0053
0054 #endif