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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2015, vol. 115, 22, p. -

Observation of B0 →p Λ ¯ D (∗)-

Chang Y. Y., Wang M. Z., Abdesselam A., Adachi I., Adamczyk K., Aihara H., Al Said S., Asner D. M., Atmacan H., Aushev T., Babu V., Badhrees I., Bakich A. M., Barberio E., Bhuyan B., Biswal J., Bobrov A., Bozek A., Bračko M., Browder T. E., Červenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Chobanova V., Choi S. K., Choi Y., Cinabro D., Dalseno J., Danilov M., Dingfelder J., DoleŽal Z., Drásal Z., Dutta D., Eidelman S., Farhat H., Fast J. E., Ferber T., Fulsom B. G., Gaur V., Gabyshev N., Ganguly S., Garmash A., Gillard R., Glattauer R., Goh Y. M., Goldenzweig P., Greenwald D., Grzymkowska O., Haba J., Hayasaka K., Hayashii H., He X. H., Hou W. S., Hsu C. L., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Jacobs W. W., Jaegle I., Joffe D., Joo K. K., Kawasaki T., Kim D. Y., Kim H. J., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim S. H., Kim Y. J., Kinoshita K., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kumita T., Kuzmin A.

© 2015 American Physical Society. We report the first observation of the decays B0→pΛ¯D(∗)-. The data sample of 711 fb-1 used in this analysis corresponds to 772×106 BB¯ pairs, collected at the (4S) resonance by the Belle detector at the KEKB asymmetric-energy e+e- collider. We observe 19.8σ and 10.8σ excesses of events for the two decay modes and measure the branching fractions of B0→pΛ¯D- and B0→pΛ¯D∗- to be (25.1±2.6±3.5)×10-6 and (33.6±6.3±4.4)×10-6, respectively, where the first uncertainties are statistical and the second are systematic. These results are not compatible with the predictions based on the generalized factorization approach. In addition, a threshold enhancement in the dibaryon (pΛ¯) system is observed, consistent with that observed in similar B decays.