Heavy flavor suppression predictions at 5.1 TeV Pb+Pb collisions at LHC

TL;DR

This paper predicts heavy flavor suppression at 5.1 TeV Pb+Pb collisions at the LHC, showing that despite higher energy, suppression remains similar to lower energies due to competing effects, testing the energy loss model.

Contribution

It provides detailed predictions for heavy flavor suppression at 5.1 TeV, revealing an unexpected energy independence that tests the dynamical energy loss formalism.

Findings

Suppression at 5.1 TeV is similar to 2.76 TeV despite higher energy.

Flattening of initial distributions counteracts increased energy loss.

Results serve as a test for the energy loss formalism.

Abstract

High momentum hadron suppression is considered to be an excellent probe of jet-medium interactions in QCD matter created in ultra-relativistic heavy ion collisions. We previously showed that our dynamical energy loss formalism can accurately explain suppression measurements at 200 GeV Au+Au collisions at RHIC and 2.76 TeV Pb+Pb collisions at the LHC. With the upcoming LHC measurements at notably higher collision energies, there is a question of what differences, with respect to the current (2.76 TeV) measurements, can be expected. In this paper we concentrate on heavy flavor suppression at the upcoming 5.1 TeV Pb+Pb collisions energy at the LHC. Naively, one would expect a notably ($\sim 30\%$) larger suppression at 5.1 TeV collision energy, due to estimated (significant) energy loss increase when transitioning from 2.76 to 5.1 TeV. Surprisingly, more detailed calculations predict nearly the same suppression results at these two energies. We show that this unexpected result is due to an interplay of the following two effects, which essentially cancel each other: i) flattening of the initial distributions with increasing collision energies, and ii) significantly slower than naively expected increase in the energy loss. Therefore, the obtained nearly the same suppression provides a clear (qualitative and quantitative) test of our energy loss formalism.