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ISSN - 00319007, EISSN - 10797114, Physical Review Letters, 2004, vol. 93, p. 131803-1

Evidence for B+ → ωl+v

Schwanda C., Abe K., Abe K., Abe T., Adachi I., Aihara H., Akatsu M., Asano Y., Aushev T., Bahinipati S., Bakich A. M., Ban Y., Banas E., Bay A., Bizjak I., Bondar A., Bozek A., Bračko M., Browder T. E., Chang M. C., Chao Y., Cheon B. G., Choi Y., Choi Y. K., Chuvikov A., Cole S., Danilov M., Dash M., Dong L. Y., Drutskoy A., Eidelman S., Eiges V., Gabyshev N., Gershon T., Gokhroo G., Golob B., Hazumi M., Higuchi I., Hinz L., Hokuue T., Hoshi Y., Hou W. S., Huang H. C., Iijima T., Inami K., Ishikawa A., Itoh R., Iwasaki H., Iwasaki M., Kang J. H., Kang J. S., Kapusta P., Katayama N., Kawai H., Kichimi H., Kim H. J., Kinoshita K., Koppenburg P., Korpar S., Križan P., Krokovny P., Kumar S., Kwon Y. J., Lange J. S., Leder G., Lee S. H., Lesiak T., Li J., Limosani A., Lin S. W., MacNaughton J., Mandl F., Matsumoto T., Matyja A., Mikami Y., Mitaroff W., Miyake H., Miyata H., Mori T., Nagamine T., Nagasaka Y., Nakano E., Nakao M., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okabe T., Okuno S., Olsen S. L., Onuki Y., Ostrowicz W., Ozaki H.

The decay of B+ → ωl+ν (l = e or μ) in 78 fb-1 of υ(4S) data accumulated with the Belle detector is discussed. To estimate the neutrino momentum, the final state is fully reconstructed using the ω decay into π+π -π0, combined with detector hermeticity. It is found that corresponding to a branching fraction of (1.3±0.4±0.2±0.3) × 10-4, a signal of 414±125 events is found in the data, where the first two errors are systematic and statistical, respectively. The estimated form-factor uncertainty is reflected from the third error.