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arXiv · 2602.07941

The structure of the $X(3915)$ meson and its production in heavy ion collisions

Sungtae Cho·Aaron Park·Su Houng Lee·Sungsik Noh
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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 $c\bar{c}s\bar{s}$ state and solve the Hamiltonian with color-spin interactions within the quark model. We find that the ground state of the $c\bar{c}s\bar{s}$ with total spin 0 obtained from the quark model analysis favors a separated $D_s \bar{D}_s$ 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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Sungtae Cho, Aaron Park, Su Houng Lee, Sungsik Noh. 2026-02-08. The structure of the $X(3915)$ meson and its production in heavy ion collisions. https://arxiv.org/abs/2602.07941

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