12th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions

Observing jet quenching using generalized jet angularities in Au+Au collisions at sNN=200 GeV from STAR

24 Sept 2024, 16:35

1h 55m

DEJIMA MESSE NAGASAKI

Poster 1. Jets modification and medium response Poster Session

Speaker

Mr Diptanil Roy (Rutgers University)

Description

Jets originating from hard-scattered partons in the early stages of heavy-ion collisions travel through the Quark Gluon Plasma (QGP) and are modified or quenched relative to a $p$+$p$ collision baseline. Moments of the jet's transverse momentum ($p_{\mathrm{T}}$) profile in the $\eta -\varphi$ plane relative to the jet-axis are an important class of jet substructure observables to study in medium modifications of the jet's radiation and fragmentation patterns called generalized jet angularities. Previous measurements of these angularities have been performed using quenched jets from Pb+Pb collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=2.76$ TeV in the LHC, and similar measurements using heavy-ion collisions at RHIC energies will probe jet quenching in a region of phase space that is complementary to the region probed in the LHC.

In this study, we present nuclear modification factors ($R_{\mathrm{A}\mathrm{A}}$) using simultaneous fully corrected measurements of various generalized jet angularities using jets from Au+Au collisions at $\sqrt{s_{\mathrm{N}\mathrm{N}}}=200$ GeV and $p$+$p$ collisions at $\sqrt{s}=200$ GeV collected by the STAR experiment. We also explore a novel machine-learning based method that measures the degree to which quenched and unquenched jets are distinguishable. Both these measurements are differential in centrality of the Au+Au collisions.

Presentation materials

Tanmay_Poster_vF.pdf