Abstract

Nuclear–nuclear collisions at energies attainable at the large accelerators RHIC and the LHC are an ideal environment to study nuclear matter under extreme conditions of high temperature and energy density. One of the most important probes of such nuclear matter is the study of production of jets. In this article, several jet shape observables in Au+Au collisions at the center of mass energy per nucleon–nucleon pair of s N N = 200 GeV simulated in the Monte Carlo generator JEWEL are presented. Jets were reconstructed using the anti- k T algorithm and their shapes were studied as a function of the jet-resolution parameter R, transverse momentum p T and collision centrality.

Highlights

  • The study of production of jets is one of the most important probes of nuclear matter under extreme conditions of high temperature and energy density

  • This article is focused on two jet shape observables: the girth and momentum dispersion that will be described in more detail below

  • The jet shape observables are calculated for different values of the resolution parameter R and charged jet pT separately for vacuum and medium with “recoils on/off” option

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Summary

Introduction

The study of production of jets is one of the most important probes of nuclear matter under extreme conditions of high temperature and energy density. The jet is a collimated spray of hadrons originating from fragmentation of a hard parton created in the initial stage of the nucleus–nucleus collision and can be used for tomography of the nuclear matter (Figure 1). As jets mostly conserve the energy and the direction of the originating parton, they are measured in particle detectors and studied to determine the properties of the original quarks. To probe the complimentary aspects of the jet fragmentation and constrain theoretical description of jet–medium interactions, different observables related to shapes of jets are studied at the CERN. It is important to perform similar measurements at lower collision energies at the Relativistic Heavy Ion Collider (RHIC) taking advantage of new high statistics data. This article is focused on two jet shape observables: the girth and momentum dispersion that will be described in more detail below

Jet Shape Observables
The Anti-k T Algorithm
Results
Conclusions

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