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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2014, vol. 90, p. -

Observation of the decay B0 →η′K∗ (892)0

Sato S., Yusa Y., Mohanty G. B., Abdesselam A., Adachi I., Aihara H., Al Said S., Asner D. M., Aushev T., Ayad R., Bahinipati S., Bakich A. M., Bansal V., Bhardwaj V., Bhuyan B., Bonvicini G., Bozek A., Bračko M., Browder T. E., Červenkov D., Chang P., Chekelian V., Chen A., Cheon B. G., Chilikin K., Cho K., Chobanova V., Choi Y., Cinabro D., Dalseno J., Danilov M., DoleŽal Z., Drásal Z., Drutskoy A., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Ganguly S., Garmash A., Gillard R., Glattauer R., Goh Y. M., Golob B., Grzymkowska O., Hayasaka K., Hayashii H., He X. H., Higuchi T., Hou W. S., Huschle M., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki Y., Jaegle I., Joo K. K., Julius T., Kato E., Kawasaki T., Kim D. Y., Kim J. B., Kim J. H., Kim K. T., Kim M. J., Kim Y. J., Kinoshita K., Klucar J., Ko B. R., Kodyš P., Korpar S., KriŽan P., Krokovny P., Kuhr T., Kumita T., Kwon Y. J., Li J., Li Y., Libby J., Liventsev D., Matvienko D., Miyabayashi K., Miyata H., Mizuk R., Moll A.

© 2014 American Physical Society. We report a search for charmless hadronic decays of neutral B mesons to η′K∗(892)0. The results are based on a 711fb-1 data sample that contains 772×106BB¯ pairs, collected at the (4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. We observe the decay for the first time with a significance of 5.0 standard deviations and obtain its branching fraction B[B0→η′K∗(892)0]=[2.6±0.7(stat)±0.2(syst)]×10-6. We also measure the CP-violating asymmetry as ACP[B0→η′K∗(892)0]=-0.22±0.29(stat)±0.07(syst).