Analysis of $X(3872)$ production via Heavy-Meson Effective Theory

We analyze the $X(3872)$ production in the processes $\bar{D} D \rightarrow \pi X$, $\bar{D}^* D \rightarrow \pi X$ and $\bar{D}^* D^* \rightarrow \pi X$, making use of the Heavy-Meson Effective Theory, with an effective Lagrangian built based on chiral $SU(3)_{L} \times SU(3)_{R}$ and heavy quark symmetries. In this scenario, we consider $X$ as a bound state of $D^{*} \bar{D} + c.c.$, including neutral and charged components, and obtain the cross sections the mentioned reactions as function of collision energy.