Compact Muon Solenoid
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| CMS-PAS-HIN-25-014 | ||
| Charged particle nuclear modification factor in neon-neon collisions and system-size dependence of nuclear suppression effects | ||
| CMS Collaboration | ||
| 2025-09-15 | ||
| Abstract: Measurements of high transverse momentum ($ p_{\mathrm{T}} $) charged particles in light ion collisions probe the onset of medium-induced parton energy loss and the formation of a hot, deconfined medium in small systems. In this Note, we report the first measurement of the $ p_{\mathrm{T}} $-differential invariant cross section for charged particles in minimum-bias neon-neon collisions at $ \sqrt {\smash [b]{s_{_{\mathrm {NN}}}}} = $ 5.36 TeV, in the range 3 $ < p_{\mathrm{T}} < $ 100 GeV, using 0.76 nb$^{-1}$ of data collected with the CMS detector in 2025. The corresponding nuclear modification factor, computed using a proton-proton reference at the same energy, is also presented. The results are compared to theoretical predictions and to a recent measurement in oxygen-oxygen collisions by the CMS experiment. When examined together with existing oxygen-oxygen, xenon-xenon, and lead-lead data, the neon-neon data allow for a comparative study of system-size dependence of nuclear suppression effects in a model-independent way. These measurements provide experimental constraints on the minimal conditions needed for the emergence of a collective state of deconfined quarks and gluons created in nucleus-nucleus collisions. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
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Compact Muon Solenoid LHC, CERN |
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