Event-by-event jet anisotropy and hard-soft tomography of the quark-gluon plasma

• Published in: arXiv.org
• Main Authors: He, Yayun, Chen, Wei, Luo, Tan, Cao, Shanshan, Long-Gang, Pang, Wang, Xin-Nian
• Format: Paper
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 20.01.2022
• Subjects: Anisotropy; Elastic scattering; Energy dissipation; Flow coefficients; Gluons; Hadrons; Heavy ions; Initial conditions; Ionic collisions; Mathematical models; Partons; Quantum chromodynamics; Quark-gluon plasma; Quarks; Quenching; Radial flow; Shear viscosity; Spectra; Transverse momentum
• ISSN: 2331-8422

Suppression of jet spectra or jet quenching in high-energy heavy-ion collisions is caused by jet energy loss in the dense medium. The azimuthal anisotropy of jet energy loss in non-central heavy-ion collisions can lead to jet anisotropy which in turn can provide insight into the path-length dependence of jet quenching. This is investigated within the Linear Boltzmann Transport (LBT) model which simulates both elastic scattering and medium-induced gluon radiation based on perturbative QCD for jet shower and medium recoil partons as well as radiated gluons as they propagate through the quark-gluon plasma (QGP). The dynamical evolution of the QGP in each event of heavy-ion collisions is provided by the (3+1)D CLVisc hydrodynamic model with fully fluctuating initial conditions. This framework has been shown to describe the suppression of single inclusive jet spectra well. We calculate in this study the elliptic (\(v_{2}^{\rm jet}\)) and triangular (\(v_{3}^{\rm jet}\)) anisotropy coefficients of the single inclusive jet spectra in Pb+Pb collisions at the LHC energies. We investigate the colliding energy, centrality, jet transverse momentum dependence of the jet anisotropy, as well as their event-by-event correlation with the flow coefficients of the soft bulk hadrons. An approximate linear correlation between jet and bulk \(v_2\) is found. Effect of the bulk \(v_n\) fluctuation on \(v_n^{\rm jet}\) is found negligible. The jet-induced medium excitation, which is influenced by radial flow, is shown to enhance \(v_{2}^{\rm jet}\) and the enhancement increases with the jet cone size. The jet elliptic anisotropy \(v_{2}^{\rm jet}\) is also found to be slightly enhanced by the shear viscosity of the bulk medium in comparison to the LBT results when jets propagate through an ideal hydrodynamic QGP medium.