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Measurements of the azimuthal anisotropy of jets and high-$p_{\mathrm{T}}$ charged particles in Pb+Pb collisions with the ATLAS detector

Mar 28, 2023, 3:00 PM
Cranach-Saal (Stadthalle)



Talk Jets and their modification in QCD matter Parallel: Jets and their modification in QCD Matter


Xiaoning Wang (University of Illinois Urbana-Champaign)


The heavy-ion collisions produce a hot, dense medium, and high-momentum partons from the collision traverse this medium while losing energy to it. This talk presents new measurements of the azimuthal dependence with respect to the event plane of single jet yields and high momentum charged particles 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 measurements give insight into the path-length dependence of parton energy loss. The magnitude of angular modulation is quantified by the parameter $v_n$ with respect to the $n^{th}$ order event plane. In this talk we will present these two measurements 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 transverse momentum regime and higher-order harmonics than current measurements benefiting from the high statistics 2018 Pb+Pb heavy ion data recorded by ATLAS. These measurements provide new information about the path-length dependence of jet quenching.


ATLAS Collaboration

Experiment/Theory ATLAS

Primary author

Xiaoning Wang (University of Illinois Urbana-Champaign)

Presentation materials