Tetraquarks with open charm favor

TL;DR

This study investigates open charm tetraquarks, interpreting the $X_{0}(2900)$ as a molecular state and predicting additional bound and resonance states, providing guidance for future experimental searches.

Contribution

The paper systematically analyzes open charm tetraquarks using the quark delocalization color screening model, identifying molecular and resonance states with specific configurations.

Findings

$X_{0}(2900)$ can be interpreted as a $ar{D^{*}}K^{*}$ molecular state.

Two bound states with energies 2341.2 MeV and 2489.7 MeV are predicted.

No bound state for $ucar{d}ar{s}$ systems, challenging some molecular interpretations.

Abstract

Inspired by the recent report of the exotic states $X_{0}(2900)$ and $X_{1}(2900)$ with four different quark flavors in the $D^{-}K^{+}$ invariant mass distributions of the decay process $B^{+}\rightarrow D^{+}D^{-}K^{+}$ by the LHCb collaboration, we systematically investigate the tetraquarks composed of $ud\bar{s}\bar{c}$ with meson-meson and diquark-antidiquark structures in the quark delocalization color screening model. We find that the $X_{0}(2900)$ can be interpreted as the molecular state $\bar{D^{*}}K^{*}$ with $IJ^{P}=00^{+}$. Moreover, two bound states are obtained by the channel coupling calculation, with energies $2341.2$ MeV for $IJ^{P}=00^{+}$ and $2489.7$ MeV for $IJ^{P}=01^{+}$, respectively. We also extend our study to the $uc\bar{d}\bar{s}$ systems and find that there is no any bound state, so the $D_{s0}(2317)$ cannot be identified as the $DK$ molecular state in present calculation. Besides, several resonance states with the diquark-antidiquark configuration are possible in both $ud\bar{s}\bar{c}$ and $uc\bar{d}\bar{s}$ systems. All these open charm bound states and resonances are worth searching in the future experiments.