PhysUtils.h

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//____________________________________________________________________________
/*!
 
\namespace  genie::utils::phys
 
\brief      Various physics formulas & utilities
 
\author     Costas Andreopoulos <c.andreopoulos \at cern.ch>
            University of Liverpool
 
\created    January 22, 2008
 
\cpright    Copyright (c) 2003-2025, The GENIE Collaboration
            For the full text of the license visit http://copyright.genie-mc.org            
*/
//____________________________________________________________________________
 
#ifndef _PHYS_UTILS_H_
#define _PHYS_UTILS_H_
 
#include <TLorentzVector.h>
 
namespace genie {
namespace utils {
 
namespace phys
{
  // Formation zone in fm
  double FormationZone(
     double m, const TLorentzVector & p, const TVector3 & p3hadr, double ct0 /*in fm*/, double K);
 
  // Longitudinal to transverse cross section ratio (R) parametrizations
  double R99118   (double x, double Q2); ///< PRL 98, 142301, 2007
  double RWhitlow (double x, double Q2);
 
  // Extract F1, F2, xF3 from a three d^2sigma/dxdy cross section values
  // evaluated at different (E,y) for fixed (x,Q2)
  // See H.Gallagher, Nucl.Phys.Proc.Suppl.159:229-234,2006
/*
  void ExtractStructFunc (
    double x, double Q2, double dxs[3], double& F1, double& F2, double& xF3);
*/
 
} // phys  namespace
} // utils namespace
} // genie namespace
 
#endif // _PHYS_UTILS_H_