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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2008, vol. 77, p. -

Study of B→D**lν with full reconstruction tagging

Liventsev D., Adachi I., Aihara H., Arinstein K., Aushev T., Bakich A. M., Balagura V., Barberio E., Bay A., Bitenc U., Bondar A., Bozek A., Bračko M., Brodzicka J., Browder T. E., Chang P., Chao Y., Chen A., Chen K. F., Chen W. T., Cheon B. G., Chistov R., Cho I. S., Choi Y., Cole S., Dalseno J., Danilov M., Dash M., Drutskoy A., Eidelman S., Epifanov D., Gabyshev N., Golob B., Ha H., Haba J., Hayasaka K., Hayashii H., Hazumi M., Heffernan D., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Ishikawa A., Ishino H., Itoh R., Iwasaki M., Iwasaki Y., Kah D. H., Kang J. H., Kapusta P., Kawai H., Kawasaki T., Kichimi H., Kim H. J., Kim Y. J., Kinoshita K., Korpar S., Križan P., Krokovny P., Kumar R., Kuo C. C., Kuzmin A., Kwon Y. J., Lee J. S., Lee M. J., Lee S. E., Lesiak T., Limosani A., Lin S. W., Liu Y., Mandl F., McOnie S., Medvedeva T., Miyake H., Miyata H., Miyazaki Y., Mizuk R., Mohapatra D., Moloney G. R., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Nishida S., Nitoh O., Nozaki T., Ogawa S., Ohshima T., Okuno S., Olsen S. L., Ozaki H.

We report a study of semileptonic B decays to P-wave D** mesons. Semileptonic decay to a D2* meson is observed for the first time and its product branching ratio is measured to be B(B+→D̄2*0 +ν)×B(D̄2*0→D-π+)=0.22±0.03(stat.)±0. 04(syst.)%. The result is obtained using fully reconstructed B tags from a data sample that contains 657×106BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. © 2008 The American Physical Society.