genie::utils::frgmfunc Namespace Reference

Fragmentation functions. More...

Functions
double	collins_spiller_func (double *x, double *par)
	The Collins-Spiller fragmentation function.
double	peterson_func (double *x, double *par)
	The Peterson fragmentation function.

Detailed Description

Fragmentation functions.

Author

Costas Andreopoulos <c.andreopoulos \at cern.ch> University of Liverpool

Created:\n June 15, 2004

License:\n Copyright (c) 2003-2025, The GENIE Collaboration

For the full text of the license visit http://copyright.genie-mc.org

Function Documentation

collins_spiller_func()

double genie::utils::frgmfunc::collins_spiller_func	(	double *	x,
		double *	par )

The Collins-Spiller fragmentation function.

Definition at line 16 of file FragmentationFunctions.cxx.

{
// par[0] = N
// par[1] = epsilon
 
  double z = x[0];
 
  double D = par[0] * ( (1.-z)/z + par[1]*(2.-z)/(1.-z) ) *
                         pow(1+z, 2.) * pow(1. - 1./z - par[1]/(1.-z), -2.);
  return D;
}

Referenced by genie::CollinsSpillerFragm::BuildFunction().

peterson_func()

double genie::utils::frgmfunc::peterson_func	(	double *	x,
		double *	par )

The Peterson fragmentation function.

Definition at line 28 of file FragmentationFunctions.cxx.

{
// par[0] = N
// par[1] = epsilon
 
  double z = x[0];
 
  double D = par[0] / ( z * pow(1. - 1./z - par[1]/(1.-z), 2) );
 
  return D;
}

Referenced by genie::PetersonFragm::BuildFunction().