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Structure of the X(3915) meson and its production in heavy ion collisions

Sungtae Cho1,*, Aaron Park2,†, Su Houng Lee2,‡, and Sungsik Noh1,§

  • *Contact author: sungtae.cho@kangwon.ac.kr
  • †Contact author: aaron.park@yonsei.ac.kr
  • ‡Contact author: suhoung@yonsei.ac.kr
  • §Contact author: sungsiknoh@kangwon.ac.kr
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Phys. Rev. D 114, 034035 – Published 17 August, 2026

DOI: https://doi.org/10.1103/129f-b8vl

Abstract

We study the structure of the X(3915) meson in a quark model and explore how its production in heavy ion collisions depends on its internal structure. We first analyze the X(3915) as a cc¯ss¯ state and solve the Hamiltonian with color-spin interactions within the quark model. We find that the ground state of the cc¯ss¯ with total spin 0 obtained from the quark model analysis favors a separated DsD¯s state. To probe its structure further, we study its production in relativistic heavy ion collisions for various proposed configurations. We calculate the transverse momentum distributions and yields for the X(3915) assuming its structure to be either a charmonium, a tetraquark, or a hadronic molecular state. We argue that, by measuring the transverse momentum distributions and yields of the X(3915) produced in heavy ion collisions, one can identify the structure of the X(3915).

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Phys. Rev. D 114, 034035– Published 17 August, 2026
  • Received 16 March 2026
  • Accepted 16 July 2026
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