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Measurement of medium-induced acoplanarity in central Au-Au and 𝑝ⁱ𝑝 collisions at $\sqrt{s_{NN}}$ = 200 GeV using direct-photon + jet and 𝜋0 + jet correlations
Journal article   Peer reviewed

Measurement of medium-induced acoplanarity in central Au-Au and 𝑝ⁱ𝑝 collisions at $\sqrt{s_{NN}}$ = 200 GeV using direct-photon + jet and 𝜋0 + jet correlations

B. E. Aboona, J. Adam, L. Adamczyk, I. Aggarwal, M. M. Aggarwal, Z. Ahammed, A. K. Alshammri, D. M. Anderson, E. C. Aschenauer, S. Aslam, 

Physical review. C, Vol.113(1)
01/08/2026

Abstract

Hard scattering Jet quenching NUCLEAR PHYSICS AND RADIATION PHYSICS Quark & gluon jets Quark-gluon plasma Relativistic heavy-ion collisions
The STAR Collaboration reports measurements of acoplanarity using semi-inclusive distributions of charged-particle jets recoiling from direct photon and 𝜋0 triggers, in central Au–Au and 𝑝ⁱ𝑝 collisions at $\sqrt{s_{NN}}$ = 200 GeV. Significant medium-induced acoplanarity broadening is observed for large but not small recoil jet resolution parameter, corresponding to recoil jet yield enhancement up to a factor of ≈ 20 for trigger-recoil azimuthal separation far from 𝜋. This phenomenology is indicative of the response of the quark-gluon plasma to excitation, but not the scattering of jets off of its quasiparticles. As a result, the measurements are not well described by current theoretical models which incorporate jet quenching.

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