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新山 雅之 所属 京都産業大学 理学部 物理科学科 職種 教授 |
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| 発行・発表の年月 | 2021/12 |
| 形態種別 | その他 |
| 標題 | Search for tetraquark states $X_{cc\bar{s}\bar{s } }$ in $D_{s}^{+}D_{s}^{+}~(D_{s}^{*+}D_{s}^{*+})$ final states at Belle |
| 執筆形態 | その他 |
| 著者・共著者 | Belle Collaboration,X. Y. Gao,Y. Li,C. P. Shen,I. Adachi,H. Aihara,D. M. Asner,H. Atmacan,T. Aushev,R. Ayad,P. Behera,K. Belous,M. Bessner,V. Bhardwaj,B. Bhuyan,T. Bilka,A. Bobrov,D. Bodrov,G. Bonvicini,J. Borah,A. Bozek,M. Bračko,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M. -C. Chang,P. Chang,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. -J. Cho,S. -K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,S. Das,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,D. |
| 概要 | A search for double-heavy tetraquark state candidates $X_{cc\bar{s}\bar{s } }$
decaying to $D_{s}^{+}D_{s}^{+}$ and $D_{s}^{*+} D_{s}^{*+}$ is presented for the first time using the data samples of 102 million $\Upsilon(1S)$ and 158 million $\Upsilon(2S)$ events, and the data samples at $\sqrt{s}$ = 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 [${\cal B}(\Upsilon(1S,2S) \to X_{cc\bar{s}\bar{s } } + anything) \times {\cal B}(X_{cc\bar{s}\bar{s } } \to D_{s}^{+}D_{s}^{+}(D_{s}^{*+} D_{s}^{*+}))$] in $\Upsilon(1S,2S)$ inclusive decays and the product values of Born cross section and branching fraction [$\sigma(e^+e^- \to X_{cc\bar{s}\bar{s } } + anything ) \times {\cal B}(X_{cc\bar{s}\bar{s } } \to D_{s}^{+}D_{s}^{+}(D_{s}^{*+} D_{s}^{*+}))$] in $e^+e^-$ collisions at $\sqrt{s}$ = 10.52~GeV, 10.58~GeV, and 10.867~GeV under different assumptions of $X_{cc\bar{s}\bar{s } }$ masses and widths are obtained. |
| DOI | 10.1103/PhysRevD.105.032002 |
| PermalinkURL | http://arxiv.org/abs/2112.02497v2 |
| researchmap用URL | http://arxiv.org/pdf/2112.02497v2 |