Jet Measurements in Heavy-ion Collisions with CMS

TL;DR

This paper presents detailed measurements of jet quenching phenomena in heavy-ion collisions using CMS data, extending previous results to larger angles and higher transverse momentum, and investigates flavor-dependent energy loss of jets.

Contribution

It introduces a new data-driven method for estimating underlying event contributions and provides the first detailed flavor dependence study of jet energy loss in heavy-ion collisions.

Findings

Extended measurements to large angles and high transverse momentum.

Implemented a novel event-by-event flow modulation correction.

Analyzed flavor dependence of jet energy loss, focusing on b-jets.

Abstract

The production of a strongly interacting medium in heavy-ion collisions is identified through suppression of high transverse momentum jets leading to an effect known as jet quenching. Detailed measurements of nuclear modification factors and energy flow of the aforementioned quenched jets are performed with the CMS detector. These new results extend previous measurements to large angles with respect to the quenched jets and increase reach in the transverse momentum range. High statistics pp, pPb and PbPb data taken in 2011-13 are used in the following analysis. A new data-driven method to estimate the underlying event contribution from the forward calorimeter energy distribution is employed which takes into account possible event by event flow modulation. The flavor dependence of energy loss of jets is studied by tagging heavy flavor b-jets in these systems.