Jet modification in strongly-coupled quark-gluon plasma

Park, Chanwook

Jet modification in strongly-coupled quark-gluon plasma

Chanwook Park
(
- McGill U.
)

2021

194 pages

Supervisor:

Sang Yong Jeon

Thesis: PhD

McGill U.

(2021)

Published: 2021

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Abstract: (McGill U., Montreal (main))

A deconfined plasma of quarks and gluons, known as quark-gluon plasma (QGP), is produced in relativistic heavy-ion collisions. This new state of strongly coupled matter is characterized by collective behaviour and may provide an opportunity to study Quantum Chromodynamics (QCD) under extreme temperatures and densities. One of the most remarkable experimental signatures of QGP formation is the suppression of high transverse momentum jets created in initial inelastic scattering with high momentum transfer. Measurements have demonstrated that high transverse momentum jet production in heavy-ion collisions is strongly suppressed when compared to proton-proton collisions. Interestingly, experiments of proton-lead collisions have discovered a signal of collectivity comparable to that in lead-lead collisions while no significant suppression of jet yield was observed.This thesis presents the study of jet modification in large (Pb+Pb) and small (p+Pb) colliding systems using MARTINI, a sophisticated Monte-Carlo event generator for jet evolution in heavy-ion collisions. MARTINI incorporates the AMY radiative energy loss formalism and the leading-order elastic collisional energy loss formulations. Realistic simulations at the LHC energy scales are aided by new developments in MARTINI, including the QCD running coupling, a formation time of radiation, and a thermal recoil implementation.We demonstrate that the QCD running coupling and the formation time of radiation capture the characteristics of jet quenching at the LHC energy scales. The importance of thermal recoil in describing integrated and differential jet observables is investigated. We obtain a simultaneous description of the jet nuclear modification factor and the elliptic flow coefficients for high-energy jets in p+Pb collisions using the jet quenching model within the uncertainties. This study provides a comprehensive understanding of jet quenching in heavy-ion collisions and shows an indication of quark-gluon plasma in small systems

jet: quenching
quark gluon: plasma
jet: transverse momentum
jet: transverse momentum: high
p nucleus: scattering
heavy ion: scattering
formation: time
coupling constant: energy dependence
jet: suppression
jet: production

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