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

Search for B+ → e+νe and B+ → μ+νμ decays using hadronic tagging

Yook Y., Kwon Y. J., Abdesselam A., Adachi I., Al Said S., Arinstein K., Asner D. M., Aulchenko V., Aushev T., Ayad R., Bahinipati S., Bakich A. M., Bala A., Bansal V., Bhardwaj V., Bhuyan B., Bondar A., Bonvicini G., Bozek A., Braèko M., Browder T. E., Èervenkov D., Chekelian V., Chen A., Cheon B. G., Chilikin K., Chistov R., Cho K., Chobanova V., Choi Y., Doležal Z., Drásal Z., Drutskoy A., Dutta D., Dutta K., Eidelman S., Farhat H., Fast J. E., Ferber T., Frost O., Gaur V., Gabyshev N., Ganguly S., Garmash A., Gillard R., Glattauer R., Goh Y. M., Golob B., Grzymkowska O., Haba J., Hara K., Hayasaka K., Hayashii H., He X. H., Heck M., Higuchi T., Horii Y., Hoshi Y., Hou W. S., Iijima T., Ishikawa A., Itoh R., Iwasaki Y., Iwashita T., Jaegle I., Julius T., Kato E., Katrenko P., Kawasaki T., Kiesling C., 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., Kuzmin A., Lange J. S., Li Y., Li Gioi L., Liu C., Liu Y., Liventsev D., Lukin P., Miyabayashi K.

© 2015 American Physical Society. We present a search for the rare leptonic decays B+ → e+νe and B+ → μ+νμ, using the full Υ(4S) data sample of 772 × 106 B B¯ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. One of the B mesons from the Υ(4S) → B B¯ decay is fully reconstructed in a hadronic mode, while the recoiling side is analyzed for the signal decay. We find no evidence of a signal in any of the decay modes. Upper limits of the corresponding branching fractions are determined as B(B+ → e+νe) < 3.5 × 10-6 and B(B+ → μ+νμ) < 2.7 × 10-6 at 90% confidence level.