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Search for the jet-induced diffusion wake in the quark-gluon plasma via measurements of jet-track correlations in photon-jet events in (Formula presented) collisions at (Formula presented) with the ATLAS detector
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Search for the jet-induced diffusion wake in the quark-gluon plasma via measurements of jet-track correlations in photon-jet events in (Formula presented) collisions at (Formula presented) with the ATLAS detector

G. Aad, E. Aakvaag, B. Abbott, S. Abdelhameed, K. Abeling, N. J. Abicht, S. H. Abidi, M. Aboelela, A. Aboulhorma, H. Abramowicz, …
Physical review. C, 卷.111(4), 044909
01/04/2025
Web of Science ID: WOS:001498321100001

摘要

<p>This paper presents a measurement of jet-track correlations in photon-jet events, using 1.72 nb(-1) of Pb+Pb data at root s(NN) = 5.02 TeV recorded with the ATLAS detector at the LHC. Events with energetic photon-jet pairs are selected, where the photon and jet are approximately back-to-back in azimuth. The angular correlation between jets and charged-particle tracks with transverse momentum (p(T)) in the range 0.5-2.0 GeV in the hemisphere opposite to the jet, |Delta phi(jet,track)| > pi/2, is measured as a function of their relative pseudorapidity difference, |Delta eta(jet,track)|. In central Pb+Pb collisions, these correlations are predicted to be sensitive to the diffusion wake in the quark-gluon plasma resulting from the lost energy of high-p(T) partons traversing the plasma, with a characteristic modification as a function of |Delta eta(jet,track)|. The correlations are examined with different selections on the jet-to-photon p(T) ratio to select events with different degrees of energy loss. No diffusion wake signal is observed within the current sensitivity and upper limits at 95% confidence level on the diffusion wake amplitude are reported.</p>

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