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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 Pb+Pb collisions at sNN=5.02TeV with the ATLAS detector

et al.
Creative Commons 'BY-NC' version 4.0 license
Abstract

This paper presents a measurement of jet-track correlations in photon-jet events, using 1.72 of data at 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 ( ) in the range 0.5–2.0 GeV in the hemisphere opposite to the jet, , is measured as a function of their relative pseudorapidity difference, . In central collisions, these correlations are predicted to be sensitive to the diffusion wake in the quark-gluon plasma resulting from the lost energy of high- partons traversing the plasma, with a characteristic modification as a function of . The correlations are examined with different selections on the jet-to-photon 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.

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