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  • Letter
  • Open Access

Production of doubly charmed exotic hadrons in heavy ion collisions

Yuanyuan Hu1,2, Jinfeng Liao3,*, Enke Wang1,2,†, Qian Wang1,2,‡, Hongxi Xing1,2,§, and Hui Zhang1,2,∥

  • 1Guangdong Provincial Key Laboratory of Nuclear Science, Institute of Quantum Matter, South China Normal University, Guangzhou 510006, China
  • 2Guangdong-Hong Kong Joint Laboratory of Quantum Matter, 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

  • *liaoji@indiana.edu
  • †wangek@scnu.edu.cn
  • ‡qianwang@m.scnu.edu.cn
  • §hxing@m.scnu.edu.cn
  • ∥Mr.zhanghui@m.scnu.edu.cn
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Phys. Rev. D 104, L111502 – Published 15 December, 2021

DOI: https://doi.org/10.1103/PhysRevD.104.L111502

Abstract

Hadron spectroscopy provides direct physical measurements that shed light on the nonperturbative behavior of quantum chromodynamics (QCD). In particular, various exotic hadrons such as the newly observed Tcc+ by the LHCb collaboration, offer unique insights on the QCD dynamics in hadron structures. In this paper, we demonstrate how heavy ion collisions can serve as a powerful venue for hadron spectroscopy study of doubly charmed exotic hadrons by virtue of the extremely charm-rich environment created in such collisions. The yields of Tcc+ as well as its potential isospin partners are computed within the molecular picture for Pb-Pb collisions at center-of-mass energy 2.76 TeV. We find about three-order-of-magnitude enhancement in the production of Tcc+ in Pb-Pb collisions as compared with the yield in proton-proton collisions, with a moderately smaller enhancement in the yields of the isospin partners Tcc′0 and Tcc′++. The Tcc+ yield is comparable to that of the X(3872) in the most central collisions while shows a considerably stronger decrease toward peripheral collisions, due to a “threshold” effect of the required double charm quarks for Tcc+. Final results for their rapidity and transverse momentum pT dependence as well as the elliptic flow coefficient are reported and can be tested by future experimental measurements.

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Phys. Rev. D 104, L111502– Published 15 December, 2021
  • Received 26 September 2021
  • Accepted 23 November 2021
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