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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2016, vol. 117, 1, p. -

First Observation of the Doubly Cabibbo-Suppressed Decay of a Charmed Baryon: Λc+ →pK+π-

Yang S. B., Tanida K., Kim B. H., Adachi I., Aihara H., Asner D. M., Aulchenko V., Aushev T., Babu V., Badhrees I., Bakich A. M., Barberio E., Bhardwaj V., Bhuyan B., Biswal J., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., Dash N., DoleŽal Z., Drásal Z., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Fulsom B. G., Gabyshev N., Garmash A., Gaur V., Gillard R., Goh Y. M., Goldenzweig P., Greenwald D., Grygier J., Haba J., Hamer P., Hara T., Hayasaka K., Hayashii H., Hou W. S., Iijima T., Inami K., Inguglia G., Ishikawa A., Itoh R., Iwasaki Y., Jacobs W. W., Jaegle I., Jeon H. B., Joo K. K., Julius T., Kang K. H., Kato E., Katrenko P., Kiesling C., Kim D. Y., Kim H. J., Kim J. B., Kim K. T., Kim M. J., Kim S. H., Kim S. K., Kim Y. J., Kinoshita K., Kobayashi N., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kuzmin A.

© 2016 American Physical Society.We report the first observation of the decay Λc+→pK+π- using a 980 fb-1 data sample collected by the Belle detector at the KEKB asymmetric-energy e+e- collider. This is the first observation of a doubly Cabibbo-suppressed decay of a charmed baryon. We measure the branching ratio of this decay with respect to its Cabibbo-favored counterpart to be B(Λc+→pK+π-)/B(Λc+→pK-π+)=(2.35±0.27±0.21)×10-3, where the uncertainties are statistical and systematic, respectively.