Base/ShowerBasis.h

// -*- C++ -*-
#ifndef Herwig_ShowerBasis_H
#define Herwig_ShowerBasis_H
//
// This is the declaration of the ShowerBasis class.
//
 
#include "ShowerBasis.fh"
#include "ShowerParticle.fh"
#include "Herwig/Shower/ShowerConfig.h"
#include "ThePEG/Config/ThePEG.h"
#include "ThePEG/Vectors/Lorentz5Vector.h"
 
namespace Herwig {
 
using namespace ThePEG;
 
class ShowerBasis: public Base {
 
public:
 
  enum Frame {BackToBack,Rest};
 
public:
 
  ShowerBasis() {}
  
  Frame frame() const {return frame_;}
  
  void frame(Frame frame) {frame_ = frame;}
 
  virtual vector<Lorentz5Momentum> getBasis() const; 
 
  void setBasis(const Lorentz5Momentum &p, const Lorentz5Momentum & n,
                Frame frame);
 
  const Lorentz5Momentum & pVector() const {return pVector_;}
 
  const Lorentz5Momentum & nVector() const {return nVector_;}
 
  Energy2 p_dot_n() const {return pVector_*nVector_;}
 
  virtual void transform(const LorentzRotation & r);
 
  Lorentz5Momentum sudakov2Momentum(double alpha, double beta,
                                    Energy px, Energy py) const {
    return alpha*pVector_ + beta*nVector_ + px*xPerp_ + py*yPerp_;
  }
 
private:
 
  ShowerBasis & operator=(const ShowerBasis &) = delete;
 
private:
 
  Frame frame_;
 
  Lorentz5Momentum pVector_;
 
  Lorentz5Momentum nVector_;
 
  LorentzVector<double> xPerp_;
 
  LorentzVector<double> yPerp_;
 
};
 
}
 
#endif /* Herwig_ShowerBasis_H */