PoS - Proceedings of Science
Volume 355 - 13th International Workshop in High pT Physics in the RHIC and LHC Era (High-pT2019) - Main session
Event plane dependence of jet quenching studied via azimuthal correlations and differential jet shape in Au--Au collisions at $\sqrt{s_{NN}}=200$ GeV with the STAR detector at RHIC
J. Mazer
Full text: pdf
Pre-published on: August 08, 2019
Published on: March 27, 2020
Abstract
Jet quenching, which describes the energy lost by jets while interacting with the medium, can be studied using azimuthal correlations of associated hadrons with respect to a trigger jet, and by probing the jet substructure by measuring the differential jet shape. This work will present details of both analyses and explore the impact of a jet's orientation with respect to the event plane, defined by the beam direction and the vector of the impact parameter. This will allow for the study of the path length dependence of medium modifications to the jets and their associated hadrons. Both analyses will reconstruct full (charged + neutral) jets in mid-peripheral \AuAu collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV with the STAR detector at RHIC.

The analysis for the event plane dependent jet-hadron correlations uses a robust method, known as the Reaction Plane Fit (RPF) method to remove the complex, flow-dominated heavy-ion background from the correlation functions. The event plane dependence of jet-correlated yields is quantified through ratios of yields from different jet azimuthal angle with respect to the event plane. Compared to a similar measurement made by the ALICE Collaboration, STAR has increased statistics and smaller uncertainties. No significant path length dependence of jet modifications in the medium is seen within uncertainties, which is consistent with the previous conclusion at the LHC. A first study of the differential jet shape at RHIC energies is performed with an extension to also include the event plane dependence. The jet shape variable will be used to probe the internal jet structure by looking at the radial profile of transverse momentum inside the most energetic jet of each triggered event (leading jet). This work shows early hints of a possible event plane dependence of the differential jet shape and motivates further study.
DOI: https://doi.org/10.22323/1.355.0014
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