FParameter.hh

// -*- C++ -*-
#ifndef RIVET_FParameter_HH
#define RIVET_FParameter_HH
 
#include "Rivet/Event.hh"
#include "Rivet/Projection.hh"
#include "Rivet/Projections/FinalState.hh"
 
namespace Rivet {
 

  class FParameter : public Projection {
  public:


    FParameter(const FinalState& fsp);

    RIVET_DEFAULT_PROJ_CLONE(FParameter);


    using Projection::operator=;
 
 
  protected:

    void project(const Event& e);

    //CmpState compare(const Projection& p) const;
    // Taken from Thrust.hh
    CmpState compare(const Projection& p) const {
      return mkNamedPCmp(p, "FS");
    }
 
 
  public:

    void clear();

    double F() const {
      return lambda1() >= lambda2() ? lambda2() / lambda1() : lambda1() / lambda2();
    }

    double lambda1() const {
      return _lambdas[0];
    }
    double lambda2() const {
      return _lambdas[1];
    }
 


    void calc(const FinalState& fs);

    void calc(const vector<Particle>& fsparticles);

    void calc(const vector<FourMomentum>& fsmomenta);

    void calc(const vector<Vector3>& fsmomenta);

 
 
  protected:

    vector<double> _lambdas;
 
 
  protected:

    void _calcFParameter(const vector<Vector3>& fsmomenta);
  };
 
 
}
 
#endif