EvtVectorParticle.hh

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#ifndef EVTVECTORPARTICLE_HH
#define EVTVECTORPARTICLE_HH
 
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include "EvtGenBase/EvtVector4R.hh"
 
#include <array>
#include <cassert>
 
class EvtId;
 
class EvtVectorParticle : public EvtParticle {
  public:
    EvtVectorParticle() = default;
 
    void init( EvtId part_n, double e, double px, double py, double pz );
    void init( EvtId part_n, const EvtVector4R& p ) override;
    void init( EvtId part_n, const EvtVector4R& p, const EvtVector4C&,
               const EvtVector4C&, const EvtVector4C& );
    EvtVector4C epsParent( int i ) const override
    {
        assert( i >= 0 && static_cast<std::size_t>( i ) < m_eps.size() );
 
        return boostTo( m_eps[i], this->getP4() );
    }
    EvtVector4C eps( int i ) const override
    {
        assert( i >= 0 && static_cast<std::size_t>( i ) < m_eps.size() );
 
        return m_eps[i];
    }
    EvtSpinDensity rotateToHelicityBasis() const override;
    EvtSpinDensity rotateToHelicityBasis( double alpha, double beta,
                                          double gamma ) const override;
 
  private:
    std::array<EvtVector4C, 3> m_eps;
 
    EvtVectorParticle( const EvtVectorParticle& vector );
    EvtVectorParticle& operator=( const EvtVectorParticle& vector );
};
 
#endif