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arXiv · 2509.08047

Imaging the Jet-Induced Medium Response with Energy Correlators

Hannah Bossi·Arjun Kudinoor·Ian Moult·Daniel Pablos·Ananya Rai·Krishna Rajagopal
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Abstract

Quark-gluon plasma (QGP), when viewed at length scales of order the inverse of its temperature, behaves as a strongly-coupled liquid. However, when it is probed with sufficiently high momentum transfer, asymptotic freedom mandates the presence of quark- and gluon-like quasi-particles. High energy partons within jets can trigger these high-momentum exchanges, making jets valuable probes for revealing the presence of such quasi-particles. Such elastic scatterings are implemented in the Hybrid Model, where a jet parton that scatters is deflected, kicking a medium parton, which recoils. Before and after a scattering, as one and then both partons propagate through the medium, they lose energy and momentum, exciting wakes in the QGP droplet. We use two-point and three-point energy-energy correlators (EECs) to reveal the relevant angular regions at which (modified) parton showers and wakes in the QGP each dominate, offering a new way with which to visualize and constrain the corresponding dynamics. We compare our calculations to recent CMS and ALICE measurements of two-point EECs of charged-particle tracks in jets produced in PbPb collisions. We show that our calculations are closest to the experimental measurements when elastic scattering is included and when the elastically scattered recoil-partons produce their own wakes. We also propose a new variant of the measurement that is especially sensitive to jet wakes.

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Hannah Bossi, Arjun Kudinoor, Ian Moult, Daniel Pablos, Ananya Rai, Krishna Rajagopal. 2025-09-09. Imaging the Jet-Induced Medium Response with Energy Correlators. https://arxiv.org/abs/2509.08047

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