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

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.

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ArXiv.org
Published
2025-01-01
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https://doi.org/10.3204/pubdb-2025-04638
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High-Energy Particle Collisions Research
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article
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article

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

A. Santoro, T. Reis, M. A. Ciocci, A. Vilela Pereira et al.
ArXiv.org
High-Energy Particle Collisions Research
article

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

A. Santoro, T. Reis, M. A. Ciocci, A. Vilela Pereira, Ismail Okan Atakisi, Xianfang Rong, Yeonjoon Kim, K. Rabbertz, U. Goerlach, Benjamin Huber, John D. Lawrence, G. Cummings, V. Brigljević, M. M. A. Gadallah, Ryan Mccarthy, Andrew Hart, A. Awais, P. Azzurri, L. Uplegger, B. Hacışahinoğlu, D. Nguyen, Guo-Ming Chen, Chun-Hua Jiang, Shivam Raj, V. D’Amante, Lovisa Rygaard, James Natoli, Justin Anguiano, Sam Crossley, I. Lomidze, B. Blumenfeld, W. L. Aldá Júnior, P. Zehetner, K. Piotrzkowski, H. Oğul, Aashay Arora, Magdy Louka, Sabrina Giorgetti, A. Lapertosa, M. Horzela, A. Harilal, K. Shchelina, A. Tarabini, Jihoon Shin, M. Presilla, A. Garcia-Bellido, G. Milella, A. Reimers, K. Lamichhane, Daniil Rastorguev, S. Mishra, Aurora Perego, W. Lustermann, Aman Rohilla, I. Dutta, P. Schütze, R. Klanner, Leonardo Lanteri, N. Bacchetta, D. Contardo, A. Dierlamm, A. Escalante Del Valle, C. Savard, Y. Lai, F. De Guio, E. Butz, C. Fangmeier, David Michael Morse, M. Vojinoviç, J. Luo, F. 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article en

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.

ArXiv.org
Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université de Haute-Alsace (FR), Deutsches Elektronen-Synchrotron DESY (DE), Institut Pluridisciplinaire Hubert Curien (FR), CEA Paris-Saclay (FR), Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules (FR), Institute of Nuclear Physics of Lyon (FR), Laboratoire Leprince-Ringuet (FR), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Institut de Physique des 2 Infinis de Lyon (FR), RWTH Aachen University (DE)
Openalex Percentile: Top 85%
High-Energy Particle Collisions Research
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