What question did this study set out to answer?

This research aims to measure the flow coefficients v2 and v3 for charged particles in Pb+Pb collisions to investigate jets' interactions with the Quark-Gluon Plasma (QGP).

April 22, 2026

Recent flow and correlation measurements from ATLAS in Pb+Pb collisions

Key Points

This research aims to measure the flow coefficients v2 and v3 for charged particles in Pb+Pb collisions to investigate jets' interactions with the Quark-Gluon Plasma (QGP).
Utilized the ATLAS detector to measure particle flow coefficients.
Applied scalar product and multi-particle cumulant methods.
Analyzed charged particle data across a wide momentum range.
Observed positive values of v2 and v3 up to specific transverse momentum thresholds.
Identified sensitivity of flow measurements to jets' interactions with QGP.
Results suggest significant event-by-event fluctuations affecting high energy particle production.

Abstract

This proceeding reports on the ATLAS measuremnt of v2 and v3 flow coefficients for charged particles produced in Pb+Pb collisions at √sNN = 5.02 TeV collected with the ATLAS detector at the LHC. The v2 and v3 are obtained for high pT, 1-400 GeV/c and in the centrality range 0–60%. Two methods, the scalar product and multi-particle cumulants, were used to probe the sensitivity to event-by-event fluctuations and non-flow effects. Positive values of v2 and v3 are observed up to a pT ≃ 100 GeV/c and 25 GeV/c respectively. As jets are the primary source of high pT particles, the measurement is sensitive to jets' interaction with QGP and in particular to the jets' QGP path-dependent energy loss.

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