Measurements of jet quenching and heavy flavor production with the ATLAS detector

TL;DR

This paper reports on measurements of jet quenching and heavy flavor production in PbPb collisions using the ATLAS detector, revealing significant suppression effects that are largely independent of jet pt and muon pt.

Contribution

It provides new quantitative measurements of jet suppression and heavy quark energy loss in heavy-ion collisions, with detailed dependence on collision centrality and jet size.

Findings

Jets are suppressed by about a factor of two in central collisions.

Jet suppression shows little variation with jet pt.

Heavy quark energy loss exhibits maximal suppression around Rcp ~ 0.5.

Abstract

Measurements of jet suppression in PbPb collisions by the ATLAS Collaboration are reported. The production of inclusive jet yields as a function of jet pt, collision centrality and jet size parameter R are measured and presented through the central-to-peripheral ratio, Rcp. Jets are found to be suppressed in central collisions relative to peripheral collisions by approximately a factor of two. The suppression is found to show almost no variation with jet pt, and the Rcp is found to increase slighly with increasing R. Measurements of heavy quark energy loss are also presented using muons from semi-leptonic decays of heavy flavor hadrons. The maximal suppression is observed to be Rcp ~ 0.5 and shows no significant depedence on the muon pt.