First measurements of the branching fractions for the decay modes Ξ0c → Λη and Ξ0c → Λη0 and search for the decay Ξ0c → Λπ0 using Belle and Belle II data

M Abumusabh; I Adachi; L Aggarwal; H Ahmed; Y Ahn; H Aihara; N Akopov; S Alghamdi; M Alhakami; A Aloisio; N Althubiti; K Amos; NA Ky; C Antonioli; DM Asner; H Atmacan; T Aushev; R Ayad; V Babu; S Bahinipati; P Bambade; S Banerjee; M Bartl; J Baudot; A Beaubien; J Becker; JV Bennett; FU Bernlochner; V Bertacchi; E Bertholet; M Bessner; S Bettarini; F Bianchi; D Biswas; D Bodrov; A Boschetti; A Bozek; M Bračko; P Branchini; RA Briere; TE Browder; A Budano; S Bussino; Q Campagna; M Campajola; G Casarosa; C Cecchi; P Cheema; L Chen; C Cheshta; H Chetri; K Chilikin; K Chirapatpimol; HE Cho; K Cho; SJ Cho; SK Choi; S Choudhury; S Chutia; JA Colorado-Caicedo; I Consigny; L Corona; JX Cui; S Das; EDL Cruz-Burelo; SADL Motte; GD Nardo; G De Pietro; R. de Sangro; M Destefanis; AD Canto; Z Doležal; ID Jiménez; TV Dong; X Dong; M Dorigo; G Dujany; P Ecker; D Epifanov; J Eppelt; R Farkas; P Feichtinger; T Ferber; T Fillinger; C Finck; G Finocchiaro; F Forti; BG Fulsom; A Gabrielli; E Ganiev; R Garg; G Gaudino; V Gaur; V Gautam; A Gaz; A Gellrich; G Ghevondyan; D Ghosh; H Ghumaryan; R Giordano

Journal article

First measurements of the branching fractions for the decay modes Ξ0c → Λη and Ξ0c → Λη0 and search for the decay Ξ0c → Λπ0 using Belle and Belle II data

M Abumusabh, I Adachi, L Aggarwal, H Ahmed, Y Ahn, H Aihara, N Akopov, S Alghamdi, M Alhakami, A Aloisio, N Althubiti, K Amos, NA Ky, C Antonioli, DM Asner, H Atmacan, T Aushev, R Ayad, V Babu, S Bahinipati Show all

Physical Review D | American Physical Society (APS) | Published : 2026

DOI: 10.1103/Q4N8-FQJ1

Open access

Abstract

Using data samples of 988.4 fb−1 and 427.9 fb−1 collected with the Belle and Belle II detectors, we present a study of the singly Cabibbo-suppressed decays Ξ0c → Λη, Λη0, and Λπ0. We observe the decay Ξ0c → Λη and find evidence for the decay Ξ0c → Λη0, with corresponding branching ratios determined to be (Formula presented) and (Formula presented), respectively. We find no significant signal in the Ξ0c → Λπ0 decay mode and set an upper limit at the 90% credibility level of (Formula presented). Multiplying these ratios by the world-average branching fraction of the normalization channel, (Formula presented), we obtain the absolute branching fractions of (Formula presented), and an upper limit..

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