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Item type:Publication, Search for Quasiparticle Scattering in the Quark-Gluon Plasma with Jet Splittings in pp and Pb-Pb Collisions at √ˢɴɴ =5.02 TeV(American Physical Society, 2025)The ALICE Collaboration reports measurements of the large relative transverse momentum ( Kᴛ ) component of jet substructure in p p and Pb-Pb collisions at center-of-mass energy per nucleon pair √ˢɴɴ = 5.02 TeV . Enhancement in the yield of such large- Kᴛ emissions in head-on Pb-Pb collisions is predicted to arise from partonic scattering with quasiparticles of the quark-gluon plasma. The analysis utilizes charged-particle jets reconstructed by the anti- Kᴛ algorithm with resolution parameter R = 0.2 in the transverse-momentum interval 60 < Pᴛ‚ch‚jet < 80 GeV / c . The soft drop and dynamical grooming algorithms are used to identify high transverse momentum splittings in the jet shower. Comparison of measurements in Pb-Pb and p p collisions shows medium-induced narrowing, corresponding to yield suppression of high- Kᴛ splittings, in contrast to the expectation of yield enhancement due to quasiparticle scattering. The measurements are compared to theoretical model calculations incorporating jet modification due to jet-medium interactions (“jet quenching”), both with and without quasiparticle scattering effects. These measurements provide new insight into the underlying mechanisms and theoretical modeling of jet quenching.3