Measurements of the suppression and correlations of dijets in Xe+Xe collisions at √s_NN =5.44 TeV

Measurements of the suppression and correlations of dijets is performed using 3µ⁢b⁻¹ of Xe+Xe data at √𝑠_𝑁⁢𝑁 = 5.44 TeV collected with the ATLAS detector at the CERN Large Hadron Collider. Dijets with jets reconstructed using the 𝑅=0.4 anti-𝑘_𝑡 algorithm are measured differentially in jet 𝑝_T over the range of 32 to 398 GeV and the centrality of the collisions. Significant dijet momentum imbalance is found in the most central Xe+Xe collisions, which decreases in more peripheral collisions. Results from the measurement of per-pair normalized and absolutely normalized dijet 𝑝_T balance are compared with previous Pb+Pb measurements at √𝑠_𝑁⁢𝑁 = 5.02 TeV. The differences between the dijet suppression in Xe+Xe and Pb+Pb are further quantified by the ratio of pair nuclear-modification factors. The results are found to be consistent with those measured in Pb+Pb data when compared in classes of the same event activity and when taking into account the difference between the center-of-mass energies of the initial parton scattering process in Xe+Xe and Pb+Pb collisions. These results should provide input for a better understanding of the role of energy density, system size, path length, and fluctuations in the parton energy loss.