Strange partners of the doubly charmed tetraquark $T^{+}_{cc}$

TL;DR

This paper investigates the properties and decay widths of strange partners of the doubly charmed tetraquark $T_{cc}^{+}$ using QCD sum rules, providing theoretical predictions for their masses and decay behaviors.

Contribution

It introduces a detailed QCD sum rule analysis of the spectroscopic parameters and decay widths of strange tetraquark partners, modeling different diquark configurations and calculating strong couplings.

Findings

Masses and widths of strange tetraquarks are predicted.

Decay channels and partial widths are computed.

Strong couplings at tetraquark-meson vertices are determined.

Abstract

The spectroscopic parameters and widths of the axial-vector $T_{cc:s}^{ \mathrm{AV}}$ and scalar $T_{cc:s}^{\mathrm{S}}$, $\widetilde{T}_{cc:s}^{ \mathrm{S}}$ strange partners of the doubly charmed exotic meson $T_{cc}^{+}$ with the content $cc\overline{u}\overline{s}$, are calculated in the framework of the QCD sum rule method. We model $T_{cc:s}^{\mathrm{AV}}$ as the diquark-antidiquark state composed of axial-vector and scalar components, whereas scalar particles $T_{cc:s}^{\mathrm{S}}$ and $\widetilde{ T}_{cc:s}^{\mathrm{S}}$ are built of axial-vector and scalar diquarks, respectively. The masses and current couplings of these tetraquarks are calculated in the context of the two-point sum rule approach by taking into account the quark, gluon and mixed condensates up to dimension $10$. The full width of the state $T_{cc:s}^{\mathrm{AV}}$ is found from analysis of the processes $T_{cc:s}^{\mathrm{AV}} \to D^{0}D_{s}^{\ast +}$ and $ T_{cc:s}^{\mathrm{AV}} \to D^{\ast}(2007)^{0}D_{s}^{+}$. Decays to $ D^{0}D_{s}^{+}$, $D^{\ast}(2007)^{0}D_{s}^{\ast+}$ and $D^{0}D_{s}^{+}$ mesons are utilized in the case of the scalar tetraquarks $T_{cc:s}^{\mathrm{ S}}$ and $\widetilde{T}_{cc:s}^{\mathrm{S}}$, respectively. The partial widths of the aforementioned decays are determined via the strong couplings $ g_1$, $g_2 $, $G_1$, $G_2$ and $\widetilde{G}$, which describe the strong interactions of the particles at the relevant tetraquark-meson-meson vertices. These couplings are computed using the QCD three-point sum rule method, most appropriate for the strong decays under study. ....