2026/08/04 by ATLAS Collaboration
Physics and Astronomy · #nucl-ex #hep-ex
37 pages in total, author list starting page 20, 2 tables, 6 figures, submitted to Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2023-11
arxiv created 2026/08/04 · arxiv updated 2026/08/05
Inclusive jet production is measured with the ATLAS detector at the LHC at √sNN=5.02 TeV in Pb+Pb and pp collisions, using data samples corresponding to integrated luminosities of 1.72 nb-1 and 255 pb-1, respectively. The jet nuclear modification factor, RAA, is reported for anti-kt jets with radius parameter R=0.4 in the forward-rapidity intervals 2.8<|y|<3.2 and 3.2<|y|<3.6, probing transverse momenta pT>74 GeV. The observed RAA values show a significant suppression of jet yields in Pb+Pb collisions relative to those measured in pp collisions. The suppression increases monotonically from peripheral to central collisions and exhibits a mild jet pT dependence. A comparison with previous ATLAS measurements indicates stronger jet suppression in the 2.8<|y|<3.2 region than in the |y| < 2.8 region. In the 3.2<|y|<3.6 region, the precision of the measurement does not allow a conclusive comparison with the |y|<2.8 region. These results constitute the first measurement of inclusive jet suppression at forward rapidity in heavy-ion collisions and provide new constraints on flavor, geometric, and medium-density dependence of parton energy loss.