Molecular picture for the $X_0(2866)$ as a $D^* \bar{K}^*$ $J^P=0^+$ state and related $1^+,2^+$ states

TL;DR

This paper models the $X_0(2866)$ as a molecular state of $D^* ar{K}^*$ with $J^P=0^+$, predicts related states with $1^+$ and $2^+$, and suggests experimental strategies for their observation to understand their nature.

Contribution

It provides a molecular interpretation of the $X_0(2866)$ and predicts two additional states with specific quantum numbers, guiding future experimental searches.

Findings

The $X_0(2866)$ can be described as a $D^* ar{K}^*$ molecule with $J^P=0^+$.

Predicted states with $J^P=1^+$ and $2^+$ are associated with the same interaction.

Experimental measurements of $D^*ar{K}$ and $D ar{K}$ spectra are crucial for understanding these states.

Abstract

We recall the predictions made ten years ago about a bound state of $J^P=0^+$ in $I=0 $ of the $D^* \bar{K}^*$ system, which is manifestly exotic, and we associate it to the $X_0(2866)$ state reported in the recent LHCb experiment. Fine tuning the parameters to reproduce exactly the mass and width of the $X_0(2866)$ state, we report two more states stemming from the same interaction, one with $1^+$ and the other with $2^+$. For reasons of parity, the $1^+$ state cannot be observed in $D\bar{K}$ decay, and we suggest to observe it in the $D^*\bar{K}$ spectrum. On the other hand, the $2^+$ state can be observed in $D \bar{K}$ decay but the present experiment has too small statistics in the region of its mass to make any claim. We note that measurements of the $D^*\bar{K}$ spectrum and of the $D \bar{K}$ with more statistics should bring important information concerning the nature of the $X_0(2866)$ and related ones that could be observed.