include/EvtGenBase/EvtTensorParticle.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 EVTTENSORPARTICLE_HH
0022 #define EVTTENSORPARTICLE_HH
0023
0024 #include "EvtGenBase/EvtParticle.hh"
0025 #include "EvtGenBase/EvtTensor4C.hh"
0026
0027 class EvtTensorParticle : public EvtParticle {
0028   public:
0029     EvtTensorParticle() = default;
0030
0031     void init( EvtId part_n, double e, double px, double py, double pz );
0032     void init( EvtId part_n, const EvtVector4R& p4 ) override;
0033     void init( EvtId part_n, const EvtVector4R& p4, const EvtTensor4C&,
0034                const EvtTensor4C&, const EvtTensor4C&, const EvtTensor4C&,
0035                const EvtTensor4C& );
0036     //Returns polarization tensors.
0037     EvtTensor4C epsTensorParent( int i ) const override;
0038     EvtTensor4C epsTensor( int i ) const override;
0039
0040     EvtSpinDensity rotateToHelicityBasis() const override;
0041     EvtSpinDensity rotateToHelicityBasis( double alpha, double beta,
0042                                           double gamma ) const override;
0043
0044   private:
0045     EvtTensor4C eps[5];    //eps1,eps2,eps3,eps4,eps5;
0046
0047     EvtTensorParticle( const EvtTensorParticle& tensor );
0048     EvtTensorParticle& operator=( const EvtTensorParticle& tensor );
0049 };
0050
0051 #endif