Bottomonia suppression in 2.76 TeV Pb-Pb collisions

TL;DR

This paper models the suppression of various bottomonium states in high-energy lead-lead collisions, providing predictions that align well with experimental data and improve upon previous models by better matching rapidity dependence.

Contribution

The study introduces a refined model for bottomonium suppression that accounts for excited state feed down and offers improved agreement with experimental rapidity dependence data.

Findings

Model accurately describes CMS R_AA data for Upsilon states.

Flatter rapidity dependence reduces tension with ALICE results.

Provides detailed predictions for suppression as a function of N_part, y, and p_T.

Abstract

We compute the QGP suppression of Upsilon(1s), Upsilon(2s), Upsilon(3s), chi_b1, and chi_b2 states in sqrt(s_NN)=2.76 TeV Pb-Pb collisions. Using the suppression of each of these states, we estimate the inclusive R_AA for the Upsilon(1s) and Upsilon(2s) states as a function of N_part, y, and p_T including the effect of excited state feed down. We find that our model provides a reasonable description of preliminary CMS results for the N_part-, y-, and p_T-dependence of R_AA for both the Upsilon(1s) and Upsilon(2s). Comparing to our previous model predictions, we find a flatter rapidity dependence, thereby reducing some of the tension between our model and ALICE forward-rapidity results for Upsilon(1s) suppression.