Letter
Open Access

Finding the clean process $B^{-} \to K^{-} D^{0} K^{0}$ to probe absolutely exotic four-quark states

Man-Yu Duan^1,2,*, Guan-Ying Wang^3,†, Yun Liang^4,‡, En Wang^5,§, Xiang Liu^6,7,8,9,∥, and Dian-Yong Chen^2,7,¶

¹School of Information Network Security, People’s Public Security University of China, Beijing 100038, China
²School of Physics, Southeast University, Nanjing 210094, China
³Joint Research Center for Theoretical Physics, School of Physics and Electronics, Henan University, Kaifeng 475004, China
⁴Department of Basics, Officers College of PAP, Chengdu 610213, China
⁵School of Physics, Zhengzhou University, Zhengzhou 450001, China
⁶School of Physical Science and Technology, Lanzhou University, Lanzhou 730000, China
⁷Lanzhou Center for Theoretical Physics, Lanzhou University, Lanzhou 730000, China
⁸MoE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou, Gansu 730000, China
⁹Research Center for Hadron and CSR Physics, Lanzhou University and Institute of Modern Physics of CAS, Lanzhou 730000, China

^*Contact author: duanmy@ppsuc.edu.cn
^†Contact author: wangguanying@henu.edu.cn
^‡Contact author: 905789481@qq.com
^§Contact author: wangen@zzu.edu.cn
^∥Contact author: xiangliu@lzu.edu.cn
^¶Contact author: chendy@seu.edu.cn

Phys. Rev. D 113, L091502 – Published 22 May, 2026

DOI: https://doi.org/10.1103/m4bb-t354

Abstract

Motivated by the observations of $T_{c \bar{s} 0} (2900)^{0}$ and $T_{c \bar{s} 0} (2900)^{+ +}$ , we propose to search for ${T_{c \bar{s} 0} (2900)}^{0}$ in the cleaner process $B^{-} \to K^{-} D^{0} K^{0}$ . In the $D^{*} K^{*}$ molecular picture, our estimates suggest that $T_{c \bar{s} 0} (2900)^{0}$ should contribute significantly to the $D^{0} K^{0}$ invariant mass distribution in $B^{-} \to K^{-} D^{0} K^{0}$ , as reported by the Belle II Collaboration. The corresponding fit fraction is estimated to be $(9.72 \pm 3.92) %$ or $(7.09 \pm 5.88) %$ in different fitting schemes. Further precise measurements of this process at Belle II and LHCb could be helpful for clarifying the nature of $T_{c \bar{s} 0} (2900)$ .

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Phys. Rev. D 113, L091502– Published 22 May, 2026

Vol. 113, Iss. 9 — 1 May 2026

Received 3 January 2026
Accepted 28 April 2026

DOI: https://doi.org/10.1103/m4bb-t354

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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Finding the clean process $B^{-} \to K^{-} D^{0} K^{0}$ to probe absolutely exotic four-quark states

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Finding the clean process B−→K−D0K0 to probe absolutely exotic four-quark states

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Finding the clean process $B^{-} \to K^{-} D^{0} K^{0}$ to probe absolutely exotic four-quark states