Gluon shadowing in the Glauber-Gribov model at HERA

TL;DR

This paper calculates gluon shadowing effects in nuclei using a Glauber-Gribov model with new HERA data, providing a parameter-free prediction of the total cross section and impact parameter dependence.

Contribution

It introduces a unitarity-conserving Glauber-Gribov approach using recent HERA gluon data to compute gluon shadowing in nuclei.

Findings

Strong gluon shadowing effect observed

Good agreement with other models

Impact parameter dependence characterized

Abstract

We calculate shadowing using new data on the gluon density of the Pomeron recently measured with high precision at HERA. The calculations are made in a Glauber-Gribov framework and Pomeron tree-diagrams are summed up within a unitarity-conserving procedure. The total cross section of $\vphot A$ interaction is then found in a parameter-free description, employing gluon diffractive and inclusive distribution functions as input. A strong shadowing effect is obtained, in good agreement with several other models. Impact parameter dependence of gluon shadowing is also presented.