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ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 83, p. -

Measurement of the decay B0→π-ℓ+ν and determination of |Vub|

Ha H., Won E., Adachi I., Aihara H., Aziz T., Bakich A. M., Balagura V., Barberio E., Bay A., Belous K., Bhardwaj V., Bhuyan B., Bischofberger M., Bondar A., Bozek A., Bračko M., Browder T. E., Chao Y., Chen A., Chen P., Cheon B. G., Chiang C. C., Cho I. S., Cho K., Choi K. S., Choi Y., Dalseno J., Danilov M., Doležal Z., Drutskoy A., Dungel W., Eidelman S., Gabyshev N., Golob B., Haba J., Hayasaka K., Hayashii H., Horii Y., Hoshi Y., Hou W. S., Hsiung Y. B., Hyun H. J., Iijima T., Inami K., Itoh R., Iwabuchi M., Iwasaki Y., Joshi N. J., Julius T., Kang J. H., Kawasaki T., Kiesling C., Kim H. J., Kim H. O., Kim M. J., Kim S. K., Kim Y. J., Kinoshita K., Ko B. R., Korpar S., Križan P., Kuhr T., Kumita T., Kuzmin A., Kwon Y. J., Kyeong S. H., Lange J. S., Lee M. J., Lee S. H., Li Y., Limosani A., Liu C., Liu Y., Liventsev D., Louvot R., McOnie S., Miyabayashi K., Miyata H., Miyazaki Y., Mohanty G. B., Mori T., Nagasaka Y., Nakano E., Nakao M., Nakazawa H., Natkaniec Z., Neubauer S., Nishida S., Nishimura K., Nitoh O., Nozaki T.

We present a measurement of the charmless semileptonic decay B0→π-ℓ+ν using a data sample containing 657×106 BB̄ events collected with the Belle detector at the KEKB asymmetric-energy e+e- collider operating near the Υ(4S) resonance. We determine the total branching fraction of the decay, B(B0→π-ℓ+ν)=(1.49±0.04(stat) ±0.07(syst))×10-4. We also report a new precise measurement of the differential decay rate and extract the Cabibbo-Kobayashi- Maskawa matrix element |Vub| using model-independent and model-dependent approaches. From a simultaneous fit to the measured differential decay rate and lattice QCD results, we obtain |Vub|=(3.43±0. 33)×10-3, where the error includes both experimental and theoretical uncertainties. © 2011 American Physical Society.