IGFAE and USC Phenomenology Group .......
...Phenomenology Group
 

 

Dipole-proton cross section

The imaginary part of the dipole-proton scattering amplitude is available as a FORTRAN routine for public use. This quantity has been fitted to lepton-proton data using the Balitsky-Kovchegov evolution equations with running coupling. More details can be found at

J. L. Albacete, N. Armesto, J. G. Milhano, P. Quiroga Arias and C. A. Salgado, arXiv:1012.4408

Please refer to this publication when using the routine.

In order to compute the dipole cross section, simply multiply the output from the routine by the corresponding values in Table 1 of arXiv:1012.4408 (the actual values depend on the chosen set of parameters). These values are

For the fits with only light flavors (subroutine aamqs10l):
sigma0=32.357 mb for GBW initial conditions, set a
sigma0=32.895 mb for MV initial conditions, set e
 
For the fits with light+heavy flavors (subroutine aamqs10h):
sigma0=35.465 mb for GBW initial conditions, light, set b
sigma0=18.430 mb for GBW initial conditions, heavy, set b
sigma0=35.449 mb for MV initial conditions, light, set f
sigma0=19.066 mb for MV initial conditions, heavy, set f

Full instructions and explanations can also be found at the headers of the routines.

To download the code, please follow this link

 

The main novelties on these parametrizations with respect to our older one arXiv:0902.1112 are the use of the new (H1 and ZEUS combined) HERA data with much smaller error bars as well as the inclusion of heavy flavors in the fits.

If you find any problem, please, let us know

 

 

 
 
 
 

 

                   
IGFAE and USC Phenomenology Group .......