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arXiv · 2605.29778

Search for $\Xi^0p$, $\Omega^- p$, and $\Omega^- n$ dibaryons in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays at Belle

Belle·Belle II Collaborations·:·M. Abumusabh·I. Adachi·A. Aggarwal·Y. Ahn·H. Aihara·N. Akopov·S. Alghamdi·M. Alhakami·N. Althubiti·K. Amos·N. Anh Ky·H. Atmacan·V. Aushev·R. Ayad·V. Babu·H. Bae·N. K. Baghel·P. Bambade·Sw. Banerjee·M. Bartl·J. Baudot·A. Beaubien·F. Becherer·J. Becker·G. F. Benfratello·J. V. Bennett·V. Bertacchi·M. Bertemes·E. Bertholet·M. Bessner·S. Bettarini·V. Bhardwaj·F. Bianchi·T. Bilka·D. Biswas·A. Bobrov·D. Bodrov·G. Bonvicini·J. Borah·A. Boschetti·M. Bračko·P. Branchini·R. A. Briere·T. E. Browder·A. Budano·S. Bussino·F. Callet·Q. Campagna·M. Campajola·L. Cao·G. Casarosa·C. Cecchi·M. -C. Chang·P. Cheema·L. Chen·B. G. Cheon·C. Cheshta·H. Chetri·K. Chilikin·K. Chirapatpimol·H. -E. Cho·K. Cho·S. -J. Cho·S. -K. Choi·S. Choudhury·S. Chutia·J. Cochran·J. A. Colorado-Caicedo·I. Consigny·L. Corona·H. Crotte Ledesma·S. Cuccuini·J. X. Cui·E. De La Cruz-Burelo·S. A. De La Motte·G. De Nardo·G. De Pietro·R. de Sangro·M. Destefanis·S. Dey·R. Dhayal·A. Di Canto·J. Dingfelder·Z. Doležal·X. Dong·M. Dorigo·K. Dugic·G. Dujany·P. Ecker·J. Eppelt·R. Farkas·P. Feichtinger·T. Ferber·T. Fillinger·C. Finck·F. Forti·A. Frey
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Abstract

We search for $\Xi^0p$, $\Omega^-p$, and $\Omega^-n$ dibaryon states in $\Upsilon(1S)$ and $\Upsilon(2S)$ 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 $\Xi N$ and $\Omega N$ interactions, where $N$ denotes a nucleon, motivate searches for weakly bound states. We use samples of $102$ million $\Upsilon(1S)$ and $158$ million $\Upsilon(2S)$ decays collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No significant signals are observed, and the first $90$% confidence-level upper limits are set on the branching fractions of $\Upsilon(1S)$ and $\Upsilon(2S)$ decays to $\Xi^0p$, $\Omega^-p$, and $\Omega^-n$ dibaryon states, at the level of $O(10^{-7})$-$O(10^{-6})$, depending on the channel and the assumed mass difference from the corresponding baryon-pair threshold.

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Belle, Belle II Collaborations, :, M. Abumusabh, I. Adachi, A. Aggarwal, Y. Ahn, H. Aihara, N. Akopov, S. Alghamdi, M. Alhakami, N. Althubiti, K. Amos, N. Anh Ky, H. Atmacan, V. Aushev, R. Ayad, V. Babu, H. Bae, N. K. Baghel, P. Bambade, Sw. Banerjee, M. Bartl, J. Baudot, A. Beaubien, F. Becherer, J. Becker, G. F. Benfratello, J. V. Bennett, V. Bertacchi, M. Bertemes, E. Bertholet, M. Bessner, S. Bettarini, V. Bhardwaj, F. Bianchi, T. Bilka, D. Biswas, A. Bobrov, D. Bodrov, G. Bonvicini, J. Borah, A. Boschetti, M. Bračko, P. Branchini, R. A. Briere, T. E. Browder, A. Budano, S. Bussino, F. Callet, Q. Campagna, M. Campajola, L. Cao, G. Casarosa, C. Cecchi, M. -C. Chang, P. Cheema, L. Chen, B. G. Cheon, C. Cheshta, H. Chetri, K. Chilikin, K. Chirapatpimol, H. -E. Cho, K. Cho, S. -J. Cho, S. -K. Choi, S. Choudhury, S. Chutia, J. Cochran, J. A. Colorado-Caicedo, I. Consigny, L. Corona, H. Crotte Ledesma, S. Cuccuini, J. X. Cui, E. De La Cruz-Burelo, S. A. De La Motte, G. De Nardo, G. De Pietro, R. de Sangro, M. Destefanis, S. Dey, R. Dhayal, A. Di Canto, J. Dingfelder, Z. Doležal, X. Dong, M. Dorigo, K. Dugic, G. Dujany, P. Ecker, J. Eppelt, R. Farkas, P. Feichtinger, T. Ferber, T. Fillinger, C. Finck, F. Forti, A. Frey. 2026-05-28. Search for $\Xi^0p$, $\Omega^- p$, and $\Omega^- n$ dibaryons in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays at Belle. https://arxiv.org/abs/2605.29778

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