"Azimuthal anisotropies of charged particles with high transverse momentum in Pb+Pb collisions at 5.02 TeV"

"The heavy-ion collisions produce a hot, dense medium, and high-momentum partons from the collision traverses this medium while losing energy to it. It has always been of interest to probe this medium by understanding this energy loss mechanism using experimental measurables and fluctuations, including the dependence on path-length traversed in the medium. This talk presents new measurements of the azimuthal dependence with respect to the event plane of single jet yields and high momentum track yields in Pb+Pb collisions at $\sqrt{s_{NN}} = 5.02$ TeV. As the distance traversed by the partons in the medium is dependent on the angle with respect to the event plane at which the partons are produced, these measurement give insight into the path-length dependence of parton energy loss. The magnitude of angular modulation is quantified by the parameter $v_n^{jet}$ with respect to the $n^{th}$ order event plane. In this talk we will present these two measurements from two separate analyses that show $v_2$, $v_3$, and $v_4$ as a function of $p_T$ and collision centrality. In both measurements, a non-zero value of $v_2$ and $v_3$ are observed, suggesting that fluctuations in the initial state play a small but distinct role in jet energy loss. Both measurements explore a higher momentum regime and higher-order harmonics than current measurements with the high statistics from 2018 Pb+Pb ATLAS heavy ion data. These measurements provide new information about the path-length dependence of jet quenching."