25th International Workshop on Deep Inelastic Scattering and Related Topics

Extracting nuclear shadowing from LHC coherent J/Psi data

4 Apr 2017, 15:10

20m

Small Lecture Theatre, Poynting Building

WG2) Low x and Diffraction WG2 Low x and Diffraction

Speaker

Jesus Guillermo Contreras Nuno (Czech Technical University (CZ))

Description

We present a method to extract the photonuclear cross section for the coherent production of J/Psi off lead nuclei using peripheral and ultra-peripheral cross sections measured at the LHC. The method allows to extract the photonuclear cross section up to a centre-of-mass energy of around 500 GeV.(Corresponding to x-Bjorken of 4.5 10^-5.) Using the photonuclear cross section, and the impulse approximation, one can compute a nuclear suppression factor, which can then be compared to the predictions of nuclear shadowing from any model.
In particular, we compare it to a leading-twist computation. We find a large contribution of gluon shadowing at the largest energies.

Presentation materials

DIS17_Shadowing.pdf