Observation of suppressed charged-particle production in ultrarelativistic oxygen-oxygen collisions

Abstract

A hot and dense state of nuclear matter, known as the quark-gluon plasma, is created in collisions of ultrarelativistic heavy nuclei. Highly energetic quarks and gluons, collectively referred to as partons, lose energy as they travel through this matter, leading to suppressed production of particles with large transverse momenta ($p_{\mathrm{T}}$). Conversely, high-$p_{\mathrm{T}}$ particle suppression has not been seen in proton-lead collisions, raising questions regarding the minimum system size required to observe parton energy loss. Oxygen-oxygen (OO) collisions examine a region of effective system size that lies between these two extreme cases. The CMS detector at the CERN LHC has been used to quantify charged-particle production in inclusive OO collisions for the first time via measurements of the nuclear modification factor ($R_{\mathrm{AA}}$). The $R_{\mathrm{AA}}$ is derived by comparing particle production to expectations based on proton-proton (pp) data and has a value of unity in the absence of nuclear effects. The data for OO and pp collisions at a nucleon-nucleon center-of-mass energy $\sqrt{s_{\mathrm{NN}}}$ = 5.36 TeV correspond to integrated luminosities of 6.1 nb${}^{-1}$ and 1.02 pb${}^{-1}$, respectively. The $R_{\mathrm{AA}}$ is below unity with a minimum of 0.69 $\pm$ 0.04 around $p_{\mathrm{T}}$ = 6 GeV. The data exhibit better agreement with theoretical models incorporating parton energy loss as compared to baseline models without energy loss.

Replaced with published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-25-008 (CMS Public Pages)

References in corpus (29)

• EPS09 - a New Generation of NLO and LO Nuclear Parton Distribution Functions
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Observation of long-range near-side angular correlations in proton-lead collisions at the LHC
• The Physics of Ultraperipheral Collisions at the LHC
• Bayesian analysis of heavy ion collisions with the heavy ion computational framework Trajectum
• Effects of initial flow velocity fluctuation in event-by-event (3+1)D hydrodynamics
• A transverse momentum differential global analysis of Heavy Ion Collisions
• Running the gamut of high energy nuclear collisions
• The ALICE experiment: a journey through QCD
• Transverse momentum dependence of inclusive primary charged-particle production in p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 5.02 TeV
• Production of light-flavor hadrons in pp collisions at $\sqrt{s}$ = 7 and $\sqrt{s}$ = 13 TeV
• Nuclear effects on the transverse momentum spectra of charged particles in pPb collisions at a nucleon-nucleon center-of-mass energy of 5.02 TeV
• Progress in the Glauber model at collider energies
• Predicting parton energy loss in small collision systems
• Discovering partonic rescattering in light nucleus collisions
• Nuclear PDFs After the First Decade of LHC Data
• Information field based global Bayesian inference of the jet transport coefficient
• NNLO nuclear parton distribution functions with electroweak-boson production data from the LHC
• Overview of high-density QCD studies with the CMS experiment at the LHC
• Strong constraints on jet quenching in centrality-dependent $p$+Pb collisions at 5.02 TeV from ATLAS
• Searching for QGP droplets with high-$p_T$ hadrons and heavy flavor
• Disentangling centrality bias and final-state effects in the production of high-$p_T$ ${\pi }^0$ using direct $\gamma$ in $d$$+$Au collisions at $\sqrt{s_{{}_{NN}}}=200$ GeV
• Light-nuclei gluons from dijet production in proton-oxygen collisions
• Contribution to differential ${\pi }^0$ and ${\gamma }_{\mathrm{dir}}$ modification in small systems from color fluctuation effects
• Evidence for the collective nature of radial flow in Pb+Pb collisions with the ATLAS detector
• No-quenching baseline for energy loss signals in oxygen-oxygen collisions
• Luminosity determination using Z boson production at the CMS experiment
• Search for jet quenching with dijets from high-multiplicity pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Statistical analysis of pQCD energy loss across system size, flavor, $\sqrt{s_{NN}}$, and $p_T$

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