Speaker
Description
High-energy partons produced in ultrarelativistic nucleus–nucleus collisions undergo energy loss while traversing the hot, strongly interacting medium, resulting in a suppression of high-transverse-momentum particle production. While this phenomenon is well established in heavy-ion collisions, its quantitative dependence on the size of the colliding nuclear system remains largely unconstrained. We present a systematic study of high-$p_{\mathrm{T}}$ charged-particle suppression across multiple collision systems using measurements of the nuclear modification factor, $R_{\mathrm{AA}}$. Previously published results in oxygen–oxygen, xenon–xenon, and lead–lead collisions are reanalyzed using a common $p_{\mathrm{T}}$ binning and are complemented by the first measurement of charged-particle $R_{\mathrm{AA}}$ in neon–neon collisions at $\sqrt{s_{\mathrm{NN}}}=5.36$ TeV. Presented as functions of $p_{\mathrm{T}}$ and the nuclear mass number $A$, the results span four systems and provide new constraints on the system-size dependence of parton energy loss, offering a unified experimental baseline for comparisons with QCD-based energy-loss models.
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