002942002 001__ 2942002
002942002 005__ 20251011082750.0
002942002 0248_ $$aoai:cds.cern.ch:2942002$$pcerncds:FULLTEXT$$pcerncds:cms-pas
002942002 037__ $$aCMS-PAS-HIN-25-008
002942002 110__ $$aCMS Collaboration
002942002 245__ $$aMeasurement of the charged particle nuclear modification factor in oxygen-oxygen collisions with CMS
002942002 260__ $$c2025
002942002 269__ $$aGeneva$$bCERN
002942002 520__ $$aA hot medium, known as the quark-gluon plasma (QGP), is created in collisions of relativistic heavy nuclei such as lead or gold. Highly energetic quarks and gluons, collectively referred to as partons, lose energy as they travel through the QGP leading to suppressed production of particles with transverse momenta ($p_{\mathrm{T}}$) of roughly 10--100 GeV. This suppression is typically quantified with the nuclear modification factor ($R_{\text{AA}}$). Questions regarding what minimum system size is required to see parton energy loss effects remain, as no such suppression has been seen in smaller proton-lead collisions. Experiments involving light nuclei examine a domain that lies between these two extreme cases. Using $6.1~\text{nb}^{-1}$ of oxygen-oxygen (OO) collisions and $1.02~\text{pb}^{-1}$ of proton-proton data collected at a nucleon-nucleon center-of-mass energy of $\sqrt{\smash[b]{s_{_{\mathrm{NN}}}}}=5.36$ TeV by the CMS experiment at the CERN LHC, charged particle invariant cross sections and the OO charged particle $R_{\text{AA}}$ are measured as a function of particle $p_{\mathrm{T}}$ for the first time. The $R_{\text{AA}}$ is notably suppressed, with a local minimum of $0.69\pm0.04$ at $p_{\mathrm{T}}=6$ GeV, but increases to a value of $0.97\pm0.06$ at $p_{\mathrm{T}}=100$ GeV. To evaluate if parton energy loss effects may be present in OO collisions, the data are compared to previous measurements of other collision systems and a variety of theoretical models.
002942002 6531_ $$9CMS$$aMonte-Carlo
002942002 65017 $$2SzGeCERN$$aNuclear Physics - Experiment
002942002 693__ $$aCERN LHC$$eCMS
002942002 690C_ $$aCERN
002942002 710__ $$gCMS Collaboration
002942002 78502 $$isuperseded by$$rCERN-EP-2025-226$$w2945686
002942002 8564_ $$uhttp://cms.cern.ch/iCMS/analysisadmin/cadi?ancode=HIN-25-008$$yAdditional information for the analysis (restricted access)
002942002 8564_ $$82777922$$s388481$$uhttps://cds.cern.ch/record/2942002/files/HIN-25-008-pas.pdf$$yFulltext in PDF
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002942002 859__ $$fcms-pag-conveners-heavyions@cern.ch
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002942002 980__ $$aNOTE
002942002 980__ $$aCMS-PHYSICS-ANALYSIS-SUMMARIES