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Observation of B+ →p Λ ̄ K+K- and B+ → p ̄ Λk+K+ OBSERVATION of ... P.-C. LU et al.

Lu P. C., Wang M. Z., Chistov R., Chang P., Adachi I., Ahn J. K., Aihara H., Al Said S., Asner D. M., Atmacan H., Aulchenko V., Aushev T., Ayad R., Babu V., Badhrees I., Bakich A. M., Bansal V., Behera P., Beleño C., Berger M., Bhardwaj V., Bhuyan B., Bilka T., Biswal J., Bonvicini G., Bozek A., Bračko M., Browder T. E., Cao L., Červenkov D., Chang M. C., Chekelian V., Chen A., Cheon B. G., Chilikin K., Cho K., Choi S. K., Choi Y., Choudhury S., Cinabro D., Cunliffe S., Dash N., Di Carlo S., DoleŽal Z., Dong T. V., Drásal Z., Eidelman S., Epifanov D., Fast J. E., Ferber T., Fulsom B. G., Garg R., Gaur V., Gabyshev N., Garmash A., Gelb M., Giri A., Goldenzweig P., Guido E., Haba J., Hayasaka K., Hayashii H., Hirose S., Hou W. S., Hsu C. L., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jeon H. B., Jia S., Jin Y., Joffe D., Joo K. K., Julius T., Kaliyar A. B., Kawasaki T., Kichimi H., Kiesling C., Kim D. Y., Kim H. J., Kim J. B., Kim K. T., Kim S. H., Kinoshita K., Kodyš P., Korpar S., Kotchetkov D., KriŽan P., Kroeger R., Krokovny P., Kuhr T., Kulasiri R., Kuzmin A., Kwon Y. J., Lai Y. T.

© 2019 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the https://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP 3 . We report the study of B+→pΛ̄K+K- and B+→p̄ΛK+K+ decays using a 772×106 BB̄ pair data sample recorded on the Ï (4S) resonance with the Belle detector at KEKB. The following branching fractions are measured: B(B+→pΛ̄K+K-)=(4.10-0.43+0.45±0.50)×10-6, B(B+→p̄ΛK+K+)=(3.70-0.37+0.39±0.44)×10-6, B(ηc→pΛ̄K-+c.c.)=(2.83-0.34+0.36±0.35)×10-3 and B(B+→pΛ̄φ)=(7.95±2.09±0.77)×10-7, where c.c. denotes the corresponding charge-conjugation process. The intermediate resonance decays are excluded in the four-body decay measurements. We also find evidence for B(ηc→Λ(1520)Λ̄+c.c.)=(3.48±1.48±0.46)×10-3 and B(B+→Λ(1520)Λ̄K+)=(2.23±0.63±0.25)×10-6. No significant signals are found for J/ψ→Λ(1520)Λ̄+c.c. and B+→Λ̄(1520)ΛK+; we set the 90% confidence level upper limits on their decay branching fractions as <1.80×10-3 and <2.08×10-6, respectively.