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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2014, vol. 113, p. -

Measurement of the branching fraction B (Λc+ →pK-π+)

Zupanc A., Bartel C., Gabyshev N., Adachi I., Aihara H., Asner D. M., Aulchenko V., Aushev T., Bakich A. M., Bala A., Belous K., Bhuyan B., Bondar A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang M. C., Chekelian V., Cheon B. G., Chilikin K., Chistov R., Cho I. S., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., DoleŽal Z., Drásal Z., Dutta D., Dutta K., Eidelman S., Epifanov D., Farhat H., Fast J. E., Feindt M., Ferber T., Gaur V., Ganguly S., Garmash A., Gillard R., Glattauer R., Goh Y. M., Golob B., Haba J., Hayasaka K., Hayashii H., He X. H., Hoshi Y., Hou W. S., Huschle M., Hyun H. J., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Jaegle I., Julius T., Kang J. H., Kato E., Kato Y., Kawasaki T., Kichimi H., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim M. J., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kronenbitter B., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Lee S. H., Li J., Li Y., Libby J., Liu C., Liu Y., Liu Z. Q.

We present the first model-independent measurement of the absolute branching fraction of the Λc+→pK-π+ decay using a data sample of 978fb-1 collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. The number of Λc+ baryons is determined by reconstructing the recoiling D(*)-p̄π+ system in events of the type e+e-→D(*)-p̄π+Λc+. The branching fraction is measured to be B(Λc+→pK-π+)=(6.84±0.24-0.27+0.21)%, where the first and second uncertainties are statistical and systematic, respectively. © 2014 American Physical Society.