Search for tetraquark states $X_{ccbar{s}bar{s}}$ in $D_{s}^{+}D_{s}^{+}~(D_{s}^{+}D_{s}^{+})$ final states at Belle

Gao, X. Y.*; Tanida, Kiyoshi ; Belle Collaboration*; 207 of others*

A search for double-heavy tetraquark state candidates $X_{ccbar{s}bar{s}}$ decaying to $D_{s}^{+}D_{s}^{+}$ and $D_{s}^{*+} D_{s}^{*+}$ is presented for the first time using the data samples of 102 million and 158 million events, and the data samples at = 10.52~GeV, 10.58~GeV, and 10.867~GeV corresponding to integrated luminosities of 89.5~fb $^{-1}$ , 711.0~fb $^{-1}$ , and 121.4~fb $^{-1}$ , respectively, accumulated with the Belle detector at the KEKB asymmetric energy electron-positron collider. The invariant-mass spectra of the $D_{s}^{+}D_{s}^{+}$ and $D_{s}^{*+} D_{s}^{*+}$ are studied to search for possible resonances. No significant signals are observed, and the 90% confidence level upper limits on the product branching fractions [ ${cal B}(Upsilon(1S,2S) to X_{ccbar{s}bar{s}} + anything) times {cal B}(X_{ccbar{s}bar{s}} to D_{s}^{+}D_{s}^{+}(D_{s}^{*+} D_{s}^{*+}))$ ] in inclusive decays and the product values of Born cross section and branching fraction [ $sigma(e^+e^- to X_{ccbar{s}bar{s}} + anything ) times {cal B}(X_{ccbar{s}bar{s}} to D_{s}^{+}D_{s}^{+}(D_{s}^{*+} D_{s}^{*+}))$ ] in collisions at = 10.52~GeV, 10.58~GeV, and 10.867~GeV under different assumptions of $X_{ccbar{s}bar{s}}$ masses and widths are obtained.

Language	:	English
Journal	:	Physical Review D
Volume	:	105
Number	:	3
Pages	:	p.032002_1 - 032002_12
Publication Year/Month	:	2022/02
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Paper URL	:	https://doi.org/10.1103/PhysRevD.105.032002
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Keywords	:	no keyword
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Registration No. : AA20240614
JAEA Abstracts No. : 53000185
Paper Submission No. : 28971

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Search for tetraquark states in final states at Belle

Search for tetraquark states $X_{ccbar{s}bar{s}}$ in $D_{s}^{+}D_{s}^{+}~(D_{s}^{+}D_{s}^{+})$ final states at Belle