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Ranbo.h

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// -*- C++ -*-  $Id: Ranbo.h,v 1.1 2000/01/17 23:37:32 burnett Exp $
//
// This file is part of Gismo 2
//
// Define the class Ranbo, which implements generation of n-body phase space
// according to the RAndom Momenta Beautifully Organized algorighm invented
// of Kleiss, Ellis, and Stirling, Comput. Phys. Commun. 40,356,1986.
// Coded 3 May 1994 by T. H. Burnett

#ifndef __RANBO_H
#define __RANBO_H

#include "CLHEP/Vector/LorentzVector.h"
class HepRandom;

class Ranbo
{
public:
  Ranbo(double W, unsigned n, double mu[],HepRandom& ran);
  // construct n momenta for particles of masses mu, total energy W

  ~Ranbo();
  Hep3Vector&  operator[](unsigned i){return (Hep3Vector&)q[i];}
  // return the ith 3-momentum

  float weight(){return _weight;}
  // return the weight for the event
private:
  float _weight;

  class Ran4Vec: public HepLorentzVector
  {
         public:
         Ran4Vec();
         Ran4Vec & operator *= (float f);
  };
  Ran4Vec* q;
  // array of lorentz vectors

};


#endif

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