$X_J(2900)$ states in a hot hadronic medium

Abstract

In this work we investigate the hadronic effects on the $X_{J=0,1}(2900)$ states in heavy-ion collisions. We make use of Effective Lagrangians to estimate the cross sections and their thermal averages of the processes $X_J\pi \to {\bar{D}}^{\ast }K,K^{\ast }\bar{D}$, as well as those of the corresponding inverse processes, considering also the possibility of different isospin assignments ($I=0,1$). We complete the analysis by solving the rate equation to follow the time evolution of the $X_J(2900)$ multiplicities and determine how they are affected by the considered reactions during the expansion of the hadronic matter. We also perform a comparison of the $X_J(2900)$ abundances considering them as hadronic molecular states ($J=0$ as a $S$-wave and $J=1$ as a $P$-wave) and tetraquark states at kinetic freeze-out.

Comments: 21 pages; 8 figures