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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2019, vol. 122, 8, p. -

First measurements of absolute branching fractions of the Ξc <inf>0</inf> Baryon at Belle

Li Y. B., Shen C. P., Yuan C. Z., Adachi I., Aihara H., Al Said S., Asner D. M., Aushev T., Ayad R., Badhrees I., Ban Y., Bansal V., Belenõ C., Berger M., Bhardwaj V., Bhuyan B., Bilka T., Biswal J., Bondar A., Bozek A., Bračko M., Cao L., Červenkov D., Chen A., Cheon B. G., Chilikin K., Cho K., Choi S. K., Choi Y., Cinabro D., Cunliffe S., Di Carlo S., DoleŽal Z., Dong T. V., Drásal Z., Eidelman S., Fast J. E., Fulsom B. G., Garg R., Gaur V., Gabyshev N., Garmash A., Giri A., Goldenzweig P., Greenwald D., Grube B., Hayasaka K., Hayashii H., Hsu C. L., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki M., Iwasaki Y., Jacobs W. W., Jia S., Jin Y., Joffe D., Joo K. K., Karyan G., Kawasaki T., Kichimi H., 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., Kumita T., Kuzmin A., Kwon Y. J., Lee J. Y., Lee S. C., Li L. K., Li Gioi L., Libby J., Liventsev D., Lubej M., Macnaughton J., Masuda M., Matsuda T., Merola M., Miyabayashi K., Miyata H., Mizuk R., Mohanty G. B., Mussa R., Nakano E., Nakao M., Nath K. J., Nayak M., Niiyama M.

© 2019 Authors. Published by the American Physical Society. We present the first measurements of absolute branching fractions of Ξc 0 decays into Ξ-π+, ΛK-π+, and pK-K-π+ final states. The measurements are made using a dataset comprising (772±11)×106 BB̄ pairs collected at the (4S) resonance with the Belle detector at the KEKB e+e-collider. We first measure the absolute branching fraction for B-→Λ̄c-Ξc 0 using a missing-mass technique; the result is B(B-→Λ̄c-Ξc 0 )=(9.51±2.10±0.88)×10-4. We subsequently measure the product branching fractions B(B-→Λ̄c-Ξc 0 )B(Ξc 0 →Ξ-π+), B(B-→Λ̄c-Ξc 0 )B(Ξc 0 →ΛK-π+), and B(B-→Λ̄c-Ξc 0 )B(Ξc 0 →pK-K-π+) with improved precision. Dividing these product branching fractions by the result for B-→Λ̄c-Ξc 0 yields the following branching fractions: B(Ξc 0 →Ξ-π+)=(1.80±0.50±0.14)%, B(Ξc 0 →ΛK-π+)=(1.17±0.37±0.09)%, and B(Ξc 0 →pK-K-π+)=(0.58±0.23±0.05)%. For the above branching fractions, the first uncertainties are statistical and the second are systematic. Our result for B(Ξc 0 →Ξ-π+) can be combined with Ξc 0 branching fractions measured relative to Ξc 0 →Ξ-π+ to yield other absolute Ξc 0 branching fractions.