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

TL;DR

This paper studies how the $X_{J=0,1}(2900)$ states are affected by hadronic interactions in heavy-ion collisions, analyzing their production, evolution, and possible internal structures like molecular or tetraquark states.

Contribution

It provides a detailed analysis of the hadronic effects on $X_{J=0,1}(2900)$ states using effective Lagrangians and compares molecular and tetraquark interpretations at freeze-out.

Findings

Hadronic reactions significantly influence $X_{J=0,1}(2900)$ multiplicities.

The study estimates cross sections and thermal averages for relevant processes.

Differences in $X_{J=0,1}(2900)$ abundances are observed between molecular and tetraquark models.

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}^{*} K , K^{*} \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.