Search for medium effects using jets from bottom quarks in PbPb collisions at $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV

TL;DR

This study investigates how bottom quark jets are modified in heavy ion collisions at the LHC, revealing a significant redistribution of jet energy to larger angles compared to proton-proton collisions, especially for b jets.

Contribution

First measurement of bottom quark jet shapes in heavy ion collisions, showing medium-induced modifications larger than those for inclusive jets.

Findings

Energy redistribution in b jets is larger in PbPb than in pp collisions.

Medium effects cause jets to spread more widely in PbPb collisions.

B jets show more significant modifications than inclusive jets.

Abstract

The first study of the shapes of jets arising from bottom (b) quarks in heavy ion collisions is presented. Jet shapes are studied using charged hadron constituents as a function of their radial distance from the jet axis. Lead-lead (PbPb) collision data at a nucleon-nucleon center-of-mass energy of $\sqrt{s_\mathrm{NN}}$ = 5.02 TeV were recorded by the CMS detector at the LHC, with an integrated luminosity of 1.69 nb$^{-1}$. Compared to proton-proton collisions, a redistribution of the energy in b jets to larger distances from the jet axis is observed in PbPb collisions. This medium-induced redistribution is found to be substantially larger for b jets than for inclusive jets.