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System-size dependence of charged-particle suppression in ultrarelativistic nucleus-nucleus collisions

Belyaev, A.; Gevorgyan, A.; Hayrapetyan, A.; Tumasyan, A.; Adam, W. ; Benato, L.; Bergauer, T.; Dragicevic, M.; Gundacker, S.; Guven, A. K.; Hussain, P. S.; Jeitler, M.; Krammer, N.; Li, A.; Liko, D.; Matthewman, M.; Schieck, J.; Schöfbeck, R.; Shooshtari, M.; ... mehr

Abstract:

High-energy partons lose energy while propagating through the hot, strongly interacting medium produced in ultrarelativistic nucleus-nucleus collisions, leading to a suppression of particle production at high transverse momentum (p(T)). The dependence of this energy loss on the size of the colliding nuclear system has yet to be firmly established experimentally. This Letter presents a systematic study of charged-particle suppression across four different nucleus-nucleus collision systems using nuclear modification factors (R-AA) measured by the CMS Collaboration at the CERN LHC. Previous CMS measurements of R-AA in oxygen-oxygen, xenon-xenon, and leadlead collisions are recast with identical p(T) intervals and are complemented by the first measurement of the charged-particle R-AA in neon-neon collisions at root s(NN) = 5.36 TeV. The neon-neon data correspond to an integrated luminosity of 0.76 nb(-1). The R-AA in all collision systems examined show similar qualitative trends as a function of p(T), but have a magnitude which is ordered with the nucleon number A. The R-AA feature a downward slope at low p(T), a local minimum at around 5-7 GeV, and an upward slope with increasing p(T). ... mehr


Verlagsausgabe §
DOI: 10.5445/IR/1000196542
Veröffentlicht am 26.08.2026
Originalveröffentlichung
DOI: 10.1016/j.physletb.2026.140679
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Institut für Experimentelle Teilchenphysik (ETP)
Institut für Prozessdatenverarbeitung und Elektronik (IPE)
Scientific Computing Center (SCC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 09.2026
Sprache Englisch
Identifikator ISSN: 0370-2693
KITopen-ID: 1000196542
Erschienen in Physics Letters B
Verlag North-Holland Publishing
Band 880
Seiten 140679
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