Probing the $G(3900)$ State in Heavy-Ion Collisions

Abstract

We investigate the interactions of the recently confirmed exotic hadron $G(3900)$ with the hadronic medium composed of light mesons produced in heavy-ion collisions. Using an effective Lagrangian approach, we compute both vacuum and thermally averaged cross sections for processes such as $G(3900)+\pi \to D^{(\ast )}+{\bar{D}}^{(\ast )}$ and their inverse reactions. Following recent proposals, the $G(3900)$ is interpreted as a $P$-wave $D{\bar{D}}^{\ast }/D^{\ast }\bar{D}$ molecular state. The resulting thermally averaged cross sections are employed in a rate equation to determine the time evolution of the $G(3900)$ multiplicity, with initial conditions provided by statistical and coalescence hadronization models. We compute the number of $G(3900)$'s produced in central Pb-Pb collisions at $\sqrt{s_{NN}}=5.02$ TeV and compare it with the number of produced $Z_c(3900)$'s . We obtain a considerably smaller final yield of $G(3900)$ compared to $Z_c(3900)$.

Comments: 10 pages; 6 figures