Search for $\Xi^0p$, $\Omega^- p$, and $\Omega^- n$ dibaryons in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays at Belle
hep-exnucl-ex2026-05v1license
Abstract
We search for , , and dibaryon states in and decays, probing mass regions near the corresponding baryon-pair thresholds. Multistrange baryon-baryon interactions are relevant to neutron-star matter but remain largely unconstrained. Experimental and theoretical studies supporting attractive and interactions, where denotes a nucleon, motivate searches for weakly bound states. We use samples of million and million decays collected with the Belle detector at the KEKB asymmetric-energy collider. No significant signals are observed, and the first % confidence-level upper limits are set on the branching fractions of and decays to , , and dibaryon states, at the level of -, depending on the channel and the assumed mass difference from the corresponding baryon-pair threshold.
Cite
@article{arxiv.2605.29778,
title = {Search for $\Xi^0p$, $\Omega^- p$, and $\Omega^- n$ dibaryons in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays at Belle},
author = {Belle and Belle II Collaborations and : and M. Abumusabh and I. Adachi and A. Aggarwal and Y. Ahn and H. Aihara and N. Akopov and S. Alghamdi and M. Alhakami and N. Althubiti and K. Amos and N. Anh Ky and H. Atmacan and V. Aushev and R. Ayad and V. Babu and H. Bae and N. K. Baghel and P. Bambade and Sw. Banerjee and M. Bartl and J. Baudot and A. Beaubien and F. Becherer and J. Becker and G. F. Benfratello and J. V. Bennett and V. Bertacchi and M. Bertemes and E. Bertholet and M. Bessner and S. Bettarini and V. Bhardwaj and F. Bianchi and T. Bilka and D. Biswas and A. Bobrov and D. Bodrov and G. Bonvicini and J. Borah and A. Boschetti and M. Bračko and P. Branchini and R. A. Briere and T. E. Browder and A. Budano and S. Bussino and F. Callet and Q. Campagna and M. Campajola and L. Cao and G. Casarosa and C. Cecchi and M. -C. Chang and P. Cheema and L. Chen and B. G. Cheon and C. Cheshta and H. Chetri and K. Chilikin and K. Chirapatpimol and H. -E. Cho and K. Cho and S. -J. Cho and S. -K. Choi and S. Choudhury and S. Chutia and J. Cochran and J. A. Colorado-Caicedo and I. Consigny and L. Corona and H. Crotte Ledesma and S. Cuccuini and J. X. Cui and E. De La Cruz-Burelo and S. A. De La Motte and G. De Nardo and G. De Pietro and R. de Sangro and M. Destefanis and S. Dey and R. Dhayal and A. Di Canto and J. Dingfelder and Z. Doležal and X. Dong and M. Dorigo and K. Dugic and G. Dujany and P. Ecker and J. Eppelt and R. Farkas and P. Feichtinger and T. Ferber and T. Fillinger and C. Finck and F. Forti and A. Frey and B. G. Fulsom and A. Gabrielli and E. Ganiev and R. Garg and G. Gaudino and V. Gaur and V. Gautam and A. Gellrich and G. Ghevondyan and D. Ghosh and H. Ghumaryan and R. Giordano and A. Giri and P. Gironella Gironell and B. Gobbo and R. Godang and O. Gogota and W. Gradl and E. Graziani and D. Greenwald and Y. Guan and K. Gudkova and I. Haide and Y. Han and K. Hayasaka and H. Hayashii and S. Hazra and M. T. Hedges and A. Heidelbach and G. Heine and I. Heredia de la Cruz and T. Higuchi and M. Hoek and M. Hohmann and R. Hoppe and P. Horak and X. T. Hou and C. -L. Hsu and T. Humair and T. Iijima and K. Inami and N. Ipsita and A. Ishikawa and R. Itoh and M. Iwasaki and P. Jackson and D. Jacobi and W. W. Jacobs and E. -J. Jang and S. Jia and Y. Jin and A. Johnson and K. K. Joo and K. H. Kang and G. Karyan and C. Kiesling and C. Kim and D. Y. Kim and H. Kim and J. -Y. Kim and K. -H. Kim and K. Kinoshita and P. Kodyš and T. Koga and S. Kohani and A. Korobov and S. Korpar and E. Kovalenko and P. Križan and P. Krokovny and T. Kuhr and Y. Kulii and R. Kumar and T. Kunigo and S. Kurokawa and Y. -J. Kwon and T. Lam and J. S. Lange and T. S. Lau and R. Leboucher and H. Lee and M. J. Lee and P. Leo and P. M. Lewis and C. Li and Q. M. Li and S. X. Li and W. Z. Li and Y. Li and Y. B. Li and J. Libby and J. Lin and Z. Liptak and C. Liu and M. H. Liu and Q. Y. Liu and Z. Q. Liu and S. Longo and A. Lozar and J. L. Ma and Y. Ma and M. Maggiora and S. P. Maharana and R. Maiti and G. Mancinelli and R. Manfredi and E. Manoni and M. Mantovano and D. Marcantonio and S. Marcello and M. Marfoli and C. Marinas and A. Martens and T. Martinov and L. Massaccesi and M. Masuda and T. Matsuda and D. Matvienko and M. Maushart and J. A. McKenna and Z. Mediankin Gruberová and R. Mehta and F. Meier and D. Meleshko and M. Merola and C. Miller and M. Mirra and K. Miyabayashi and H. Miyake and R. Mizuk and G. B. Mohanty and S. Moneta and H. -G. Moser and N. Mudgal and Th. Muller and H. Murakami and R. Mussa and M. Nakao and Z. Natkaniec and A. Natochii and M. Neu and M. Niiyama and S. Nishida and R. Nomaru and S. Ogawa and H. Ono and Y. Onuki and G. Pakhlova and S. Pardi and J. Park and K. Park and S. -H. Park and S. Patra and T. K. Pedlar and R. Pestotnik and M. Piccolo and L. E. Piilonen and P. L. M. Podesta-Lerma and T. Podobnik and A. Prakash and C. Praz and S. Prell and E. Prencipe and M. T. Prim and H. Purwar and P. Rados and S. Raiz and K. Ravindran and J. U. Rehman and M. Reif and S. Reiter and L. Reuter and D. Ricalde Herrmann and I. Ripp-Baudot and G. Rizzo and S. H. Robertson and J. M. Roney and A. Rostomyan and N. Rout and S. Saha and D. A. Sanders and S. Sandilya and L. Santelj and C. Santos and V. Savinov and B. Scavino and G. Schnell and C. Schwanda and Y. Seino and K. Senyo and J. Serrano and M. E. Sevior and C. Sfienti and C. P. Shen and X. D. Shi and T. Shillington and T. Shimasaki and J. -G. Shiu and D. Shtol and B. Shwartz and A. Sibidanov and F. Simon and J. Skorupa and A. Soffer and A. Sokolov and E. Solovieva and S. Spataro and K. Špenko and B. Spruck and M. Starič and P. Stavroulakis and S. Stefkova and R. Stroili and M. Sumihama and M. Takahashi and M. Takizawa and U. Tamponi and K. Tanida and F. Testa and A. Thaller and D. V. Thanh and T. Tien Manh and O. Tittel and R. Tiwary and E. Torassa and F. F. Trantou and I. Tsaklidis and M. Uchida and I. Ueda and K. Unger and Y. Unno and K. Uno and S. Uno and Y. Ushiroda and S. E. Vahsen and R. van Tonder and K. E. Varvell and M. Veronesi and V. S. Vismaya and L. Vitale and V. Vobbilisetti and R. Volpe and M. Wakai and S. Wallner and M. -Z. Wang and A. Warburton and S. Watanuki and C. Wessel and X. P. Xu and B. D. Yabsley and S. Yamada and W. P. Yan and J. Yelton and K. Yi and J. H. Yin and K. Yoshihara and C. Z. Yuan and J. Yuan and L. Yuan and Y. Yusa and L. Zani and M. Zeyrek and B. Zhang and X. Zhao and V. Zhilich and J. S. Zhou and Q. D. Zhou and X. Y. Zhou and L. Zhu and R. Žlebčík},
journal= {arXiv preprint arXiv:2605.29778},
year = {2026}
}