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$T_{b c \bar{s}}$ states in the process $ϒ \to D^{-} {\bar{B}}^{0} D_{s}^{+}$

School of Physics, Southeast University, Nanjing 210094, People’s Republic of China

^*Contact author: hxchen@seu.edu.cn

Phys. Rev. D 112, 116004 – Published 4 December, 2025

DOI: https://doi.org/10.1103/jxjc-mzj7

Abstract

We perform a theoretical study of the decay process $ϒ \to D^{-} {\bar{B}}^{0} D_{s}^{+}$ in search of the doubly heavy tetraquark states $T_{b c \bar{s}}$ with quark content $b c \bar{s} \bar{d}$ . These $T_{b c \bar{s}}$ states are assumed to be dynamically generated molecular states from the S-wave interactions between ${\bar{B}}_{s}^{(*) 0} D^{(*) +}$ and ${\bar{B}}^{(*) 0} D_{s}^{(*) +}$ meson pairs. Based on the total angular momentum and the type of the constituent mesons (pseudoscalars $P$ or vectors $V$ ), they are labeled as $T_{b c \bar{s}}^{0, P P}$ , $T_{b c \bar{s}}^{0, V V}$ , and $T_{b c \bar{s}}^{2, V V}$ , respectively. The ${\bar{B}}^{0} D_{s}^{+}$ invariant mass distribution for this decay is calculated using current algebra, incorporating contributions from $T_{b c \bar{s}}$ states arising from final-state interactions. Our results reveal a clear peak structure in the 7415–7425 MeV region, which is attributed to the $T_{b c \bar{s}}^{2, V V}$ state. Additionally, a distinct dip structure appears near the ${\bar{B}}^{* 0} D_{s}^{* +}$ threshold, characteristic of the $T_{b c \bar{s}}^{2, V V}$ as a hadronic molecular state. A near-threshold enhancement associated with the $T_{b c \bar{s}}^{0, P P}$ state and a dip arising from the $T_{b c \bar{s}}^{0, V V}$ state are also identified, though the manifestation of these features depends sensitively on model parameter fine-tuning. Therefore, with increased experimental statistics, the decay channel $ϒ \to D^{-} {\bar{B}}^{0} D_{s}^{+}$ offers a promising avenue for discovering and characterizing the $T_{b c \bar{s}}$ states.

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Phys. Rev. D 112, 116004– Published 4 December, 2025

Vol. 112, Iss. 11 — 1 December 2025

Received 11 September 2025
Accepted 6 November 2025

DOI: https://doi.org/10.1103/jxjc-mzj7

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP³.

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$T_{b c \bar{s}}$ states in the process $ϒ \to D^{-} {\bar{B}}^{0} D_{s}^{+}$

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Tbcs¯ states in the process ϒ→D−B¯0Ds+

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$T_{b c \bar{s}}$ states in the process $ϒ \to D^{-} {\bar{B}}^{0} D_{s}^{+}$