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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2015, vol. 91, 5, p. -

Observation of X (3872) in B →x (3872)Kπ decays

Bala A., Bhardwaj V., Trabelsi K., Singh J. B., Abdesselam A., Adachi I., Aihara H., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Aziz T., Bahinipati S., Bakich A. M., Bansal V., Barberio E., Bhuyan B., Bobrov A., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chen A., Cheon B. G., Chistov R., Cho K., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Dingfelder J., DoleŽal Z., Drutskoy A., Dutta D., Eidelman S., Epifanov D., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Gabyshev N., Garmash A., Getzkow D., Goh Y. M., Golob B., Grzymkowska O., Haba J., Hara T., Hayashii H., He X. H., Heller A., Horiguchi T., Hou W. S., Huschle M., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joffe D., Kang K. H., Kato E., Kawasaki T., Kiesling C., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kumar R., Kuzmin A., Kwon Y. J., Lange J. S., Lee I. S.

© 2015 American Physical Society. We report the first observation of B0→X(3872)(K+π-) and evidence for B+→X(3872)(K0π+). We measure the product of branching fractions for the former to be B(B0→X(3872)(K+π-))×B(X(3872)→J/ψπ+π-)=(7.9±1.3(stat)±0.4(syst))×10-6 and find that B0→X(3872)K∗(892)0 does not dominate the B0→X(3872)K+π- decay mode. We also measure B(B+→X(3872)(K0π+))×B(X(3872)→J/ψπ+π-)=(10.6±3.0(stat)±0.9(syst))×10-6. This study is based on the full data sample of 711fb-1 (772×106BB¯ pairs) collected at the Υ(4S) resonance with the Belle detector at the KEKB collider.