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  • Letter
  • Open Access

Medium-assisted enhancement of χc1(3872) production from small to large colliding systems

Yu Guo1,2, Xingyu Guo1,2,*, Jinfeng Liao3,†, Enke Wang1,2,‡, and Hongxi Xing1,2,4,§

  • 1Key Laboratory of Atomic and Subatomic Structure and Quantum Control (MOE), Guangdong Basic Research Center of Excellence for Structure and Fundamental Interactions of Matter, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • 2Guangdong-Hong Kong Joint Laboratory of Quantum Matter, Guangdong Provincial Key Laboratory of Nuclear Science, Southern Nuclear Science Computing Center, South China Normal University, Guangzhou 510006, China
  • 3Physics Department and Center for Exploration of Energy and Matter, Indiana University, 2401 N Milo B. Sampson Lane, Bloomington, Indiana 47408, USA
  • 4Southern Center for Nuclear-Science Theory (SCNT), Institute of Modern Physics, Chinese Academy of Sciences, Huizhou 516000, China

  • *Contact author: guoxy@m.scnu.edu.cn
  • †Contact author: liaoji@indiana.edu
  • ‡Contact author: wangek@scnu.edu.cn
  • §Contact author: hxing@m.scnu.edu.cn
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Phys. Rev. C 110, L021901 – Published 14 August, 2024

DOI: https://doi.org/10.1103/PhysRevC.110.L021901

Abstract

Studies of exotic hadrons such as the χc1(3872) state provide crucial insights into the fundamental force governing the strong interaction dynamics, with an emerging frontier to investigate their production in high energy collisions where a partonic medium is present. The latest experimental measurements from the Large Hadron Collider show an intriguing evolution pattern of the χc1(3872)-to-ψ(2S) yield ratio from proton-proton collisions with increasing multiplicities toward proton-lead and lead-lead collisions. Here we propose a mechanism of medium-assisted enhancement for the χc1(3872) production, which competes with the more conventional absorption-induced suppression and results in a nonmonotonic trend from small to large colliding systems. Realistic simulations from this model offer a quantitative description of all available data. Predictions are made for the centrality dependence of this observable in PbPb collisions as well as for its system-size dependence from OO and ArAr to XeXe and PbPb collisions. In both cases, a nonmonotonic behavior emerges as the imprint of the competition between enhancement and suppression and can be readily tested by future data.

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Phys. Rev. C 110, L021901– Published 14 August, 2024
  • Received 13 February 2023
  • Revised 19 June 2024
  • Accepted 19 July 2024
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