2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/186094We 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.18 pages, 6 figures; references added, discussion of model enlarged, calculation of low-x contribution corrected; to appear in Phys. LettHigh Energy Physics - Phenomenologytext