Is bottomonium suppression in proton-nucleus and nucleus-nucleus collisions at LHC energies due to the same effects?

TL;DR

This paper demonstrates that bottomonium suppression in proton-nucleus and nucleus-nucleus collisions at LHC energies can be explained using a comover-interaction model with consistent parameters, accounting for both relative and absolute suppression data.

Contribution

It introduces a unified comover-interaction framework that reproduces bottomonium suppression features across different collision systems and experiments at LHC energies.

Findings

Reproduces relative suppression of excited bottomonium states using a single nonperturbative parameter.

Shows the comoving particle momentum distribution is consistent across collision types.

Accurately models absolute suppression rates when nuclear parton density modifications are included.

Abstract

We show that we can reproduce all the features of bottomonium suppression in both proton-nucleus and nucleus-nucleus collisions at LHC energies in a comover-interaction picture. For each collisions system, we use the measured {\it relative} suppression of the excited $\Upsilon$(2S) and $\Upsilon$(3S) states to $\Upsilon$(1S) by ATLAS and CMS to parametrise the scattering cross sections of all $S$- and $P$-wave bottomonia with the comoving particles created during the collisions. In addition to a single nonpertubative parameter, these cross sections depend on the momentum distribution of these comovers which we found to be the same for proton-nucleus and nucleus-nucleus collisions as well as for partonic and hadronic comovers. Moreover, we can also reproduce the {\it absolute} suppresion rates measured by ALICE, ATLAS, CMS and LHCb when the nuclear modifications of the parton densities are taken into account.