Search for the semileptonic decays Ξ_c^0 →Ξ^0ℓ^+ℓ^- at
Belle
Belle Collaboration,J. X. Cui,Y. B. Li,C. P. Shen,I. Adachi,H. Aihara,S. Al Said,D. M. Asner,T. Aushev,R. Ayad,V. Babu,S. Bahinipati,Sw. Banerjee,M. Bauer,P. Behera,K. Belous,J. Bennett,M. Bessner,B. Bhuyan,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,J. Borah,M. Bračko,P. Branchini,T. E. Browder,A. Budano,M. Campajola,D. Červenkov,M. -C. Chang,B. G. Cheon,K. Chilikin,K. Cho,S. -K. Choi,Y. Choi,S. Choudhury,S. Das,N. Dash,G. De Nardo,G. De Pietro,R. Dhamija,F. Di Capua,J. Dingfelder,Z. Doležal,T. V. Dong,S. Dubey,P. Ecker,D. Epifanov,T. Ferber,D. Ferlewicz,B. G. Fulsom,R. Garg,V. Gaur,A. Garmash,A. Giri,P. Goldenzweig,E. Graziani,K. Gudkova,C. Hadjivasiliou,S. Halder,K. Hayasaka,H. Hayashii,S. Hazra,D. Herrmann,W. -S. Hou,C. -L. Hsu,K. Inami,N. Ipsita,A. Ishikawa,R. Itoh,M. Iwasaki,W. W. Jacobs,S. Jia,Y. Jin,D. Kalita,C. Kiesling,D. Y. Kim,K. -H. Kim,Y. -K. Kim,K. Kinoshita,P. Kodyš,A. Korobov,S. Korpar,E. Kovalenko,P. Križan,P. Krokovny,T. Kuhr,D. Kumar,R. Kumar,Y. -J. Kwon,T. Lam,S. C. Lee,L. K. Li,Y. Li,L. Li Gioi,J. Libby,D. Liventsev,Y. Ma,M. Masuda,D. Matvienko,S. K. Maurya,F. Meier,M. Merola,K. Miyabayashi,R. Mizuk,R. Mussa,M. Nakao,Z. Natkaniec,A. Natochii,L. Nayak,S. Nishida,S. Ogawa,H. Ono,P. Oskin,P. Pakhlov,G. Pakhlova,S. Pardi,H. Park,J. Park,S. -H. Park,S. Patra,S. Paul,T. K. Pedlar,R. Pestotnik,L. E. Piilonen,T. Podobnik,M. T. Prim,N. Rout,G. Russo,S. Sandilya,L. Santelj,V. Savinov,G. Schnell,C. Schwanda,Y. Seino,K. Senyo,M. E. Sevior,W. Shan,C. Sharma,J. -G. Shiu,A. Sokolov,E. Solovieva,M. Starič,Z. S. Stottler,M. Sumihama,M. Takizawa,K. Tanida,F. Tenchini,R. Tiwary,T. Uglov,Y. Unno,S. Uno,Y. Usov,A. Vinokurova,M. -Z. Wang,S. Watanuki,E. Won,B. D. Yabsley,W. Yan,J. Yelton,J. H. Yin,L. Yuan,Z. P. Zhang,V. Zhilich,V. Zhukova
arxiv（2023）
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摘要
Using the full data sample of 980 fb^-1 collected with the Belle
detector at the KEKB asymmetric energy electron-positron collider, we report
the results of the first search for the rare semileptonic decays Ξ_c^0 →Ξ^0ℓ^+ℓ^- (ℓ=e or μ). No significant signals are observed in
the Ξ^0ℓ^+ℓ^- invariant-mass distributions. Taking the decay Ξ_c^0
→Ξ^- π^+ as the normalization mode, we report 90% credibility upper
limits on the branching fraction ratios B (Ξ_c^0 →Ξ^0 e^+ e^-)
/ B(Ξ_c^0→Ξ^-π^+) < 6.7 × 10^-3 and B
(Ξ_c^0 →Ξ^0 μ^+ μ^-) / B(Ξ_c^0→Ξ^-π^+) < 4.3 ×
10^-3 based on the phase-space assumption for signal decays. The 90%
credibility upper limits on the absolute branching fractions of B
(Ξ_c^0 →Ξ^0 e^+ e^-) and B (Ξ_c^0 →Ξ^0 μ^+ μ^-)
are found to be 9.9 × 10^-5 and 6.5 × 10^-5, respectively.
