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Measurement of the decay $B^{0} \to π^{-} ℓ^{+} ν$ and determination of $| V_{u b} |$

H. Ha²⁰, E. Won²⁰, I. Adachi⁸, H. Aihara⁴⁸, T. Aziz⁴³, A. M. Bakich⁴², V. Balagura¹⁵, E. Barberio²⁶, A. Bay²² et al. (The Belle Collaboration)

A. Bay²², K. Belous¹⁴, V. Bhardwaj³⁸, B. Bhuyan¹¹, M. Bischofberger²⁸, A. Bondar^1,36, A. Bozek³², M. Bračko^24,16, T. E. Browder⁷, Y. Chao³¹, A. Chen²⁹, P. Chen³¹, B. G. Cheon⁶, C.-C. Chiang³¹, I.-S. Cho⁵³, K. Cho¹⁹, K.-S. Choi⁵³, Y. Choi⁴¹, J. Dalseno^25,44, M. Danilov¹⁵, Z. Doležal², A. Drutskoy³, W. Dungel¹³, S. Eidelman^1,36, N. Gabyshev^1,36, B. Golob^23,16, J. Haba⁸, K. Hayasaka²⁷, H. Hayashii²⁸, Y. Horii⁴⁷, Y. Hoshi⁴⁶, W.-S. Hou³¹, Y. B. Hsiung³¹, H. J. Hyun²¹, T. Iijima²⁷, K. Inami²⁷, R. Itoh⁸, M. Iwabuchi⁵³, Y. Iwasaki⁸, N. J. Joshi⁴³, T. Julius²⁶, J. H. Kang⁵³, T. Kawasaki³⁴, C. Kiesling²⁵, H. J. Kim²¹, H. O. Kim²¹, M. J. Kim²¹, S. K. Kim⁴⁰, Y. J. Kim⁵, K. Kinoshita³, B. R. Ko²⁰, S. Korpar^24,16, P. Križan^23,16, T. Kuhr¹⁸, T. Kumita⁴⁹, A. Kuzmin^1,36, Y.-J. Kwon⁵³, S.-H. Kyeong⁵³, J. S. Lange⁴, M. J. Lee⁴⁰, S.-H. Lee²⁰, Y. Li⁵¹, A. Limosani²⁶, C. Liu³⁹, Y. Liu³¹, D. Liventsev¹⁵, R. Louvot²², S. McOnie⁴², K. Miyabayashi²⁸, H. Miyata³⁴, Y. Miyazaki²⁷, G. B. Mohanty⁴³, T. Mori²⁷, Y. Nagasaka⁹, E. Nakano³⁷, M. Nakao⁸, H. Nakazawa²⁹, Z. Natkaniec³², S. Neubauer¹⁸, S. Nishida⁸, K. Nishimura⁷, O. Nitoh⁵⁰, T. Nozaki⁸, S. Ogawa⁴⁵, T. Ohshima²⁷, S. Okuno¹⁷, S. L. Olsen^40,7, P. Pakhlov¹⁵, G. Pakhlova¹⁵, C. W. Park⁴¹, H. Park²¹, H. K. Park²¹, R. Pestotnik¹⁶, M. Petrič¹⁶, L. E. Piilonen⁵¹, M. Röhrken¹⁸, S. Ryu⁴⁰, H. Sahoo⁷, Y. Sakai⁸, O. Schneider²², C. Schwanda¹³, A. J. Schwartz³, K. Senyo²⁷, M. E. Sevior²⁶, M. Shapkin¹⁴, C. P. Shen⁷, J.-G. Shiu³¹, F. Simon^25,44, P. Smerkol¹⁶, Y.-S. Sohn⁵³, A. Sokolov¹⁴, S. Stanič³⁵, M. Starič¹⁶, T. Sumiyoshi⁴⁹, Y. Teramoto³⁷, K. Trabelsi⁸, S. Uehara⁸, T. Uglov¹⁵, Y. Unno⁶, S. Uno⁸, S. E. Vahsen⁷, G. Varner⁷, K. E. Varvell⁴², A. Vossen¹⁰, C. H. Wang³⁰, M.-Z. Wang³¹, P. Wang¹², M. Watanabe³⁴, Y. Watanabe¹⁷, Y. Yamashita³³, Z. P. Zhang³⁹, P. Zhou⁵², V. Zhulanov^1,36, T. Zivko¹⁶, and A. Zupanc¹⁸ (The Belle Collaboration)

¹Budker Institute of Nuclear Physics, Novosibirsk
²Faculty of Mathematics and Physics, Charles University, Prague
³University of Cincinnati, Cincinnati, Ohio 45221
⁴Justus-Liebig-Universität Gießen, Gießen
⁵The Graduate University for Advanced Studies, Hayama
⁶Hanyang University, Seoul
⁷University of Hawaii, Honolulu, Hawaii 96822
⁸High Energy Accelerator Research Organization (KEK), Tsukuba
⁹Hiroshima Institute of Technology, Hiroshima
¹⁰University of Illinois at Urbana-Champaign, Urbana, Illinois 61801
¹¹Indian Institute of Technology Guwahati, Guwahati
¹²Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
¹³Institute of High Energy Physics, Vienna
¹⁴Institute of High Energy Physics, Protvino
¹⁵Institute for Theoretical and Experimental Physics, Moscow
¹⁶J. Stefan Institute, Ljubljana
¹⁷Kanagawa University, Yokohama
¹⁸Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, Karlsruhe
¹⁹Korea Institute of Science and Technology Information, Daejeon
²⁰Korea University, Seoul
²¹Kyungpook National University, Taegu
²²École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
²³Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
²⁴University of Maribor, Maribor
²⁵Max-Planck-Institut für Physik, München
²⁶University of Melbourne, School of Physics, Victoria 3010
²⁷Nagoya University, Nagoya
²⁸Nara Women’s University, Nara
²⁹National Central University, Chung-li
³⁰National United University, Miao Li
³¹Department of Physics, National Taiwan University, Taipei
³²H. Niewodniczanski Institute of Nuclear Physics, Krakow
³³Nippon Dental University, Niigata
³⁴Niigata University, Niigata
³⁵University of Nova Gorica, Nova Gorica
³⁶Novosibirsk State University, Novosibirsk
³⁷Osaka City University, Osaka
³⁸Panjab University, Chandigarh
³⁹University of Science and Technology of China, Hefei
⁴⁰Seoul National University, Seoul
⁴¹Sungkyunkwan University, Suwon
⁴²School of Physics, University of Sydney, NSW 2006
⁴³Tata Institute of Fundamental Research, Mumbai
⁴⁴Excellence Cluster Universe, Technische Universität München, Garching
⁴⁵Toho University, Funabashi
⁴⁶Tohoku Gakuin University, Tagajo
⁴⁷Tohoku University, Sendai
⁴⁸Department of Physics, University of Tokyo, Tokyo
⁴⁹Tokyo Metropolitan University, Tokyo
⁵⁰Tokyo University of Agriculture and Technology, Tokyo
⁵¹CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁵²Wayne State University, Detroit, Michigan 48202
⁵³Yonsei University, Seoul

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Phys. Rev. D 83, 071101(R) – Published 1 April, 2011

DOI: https://doi.org/10.1103/PhysRevD.83.071101

Abstract

We present a measurement of the charmless semileptonic decay $B^{0} \to π^{-} ℓ^{+} ν$ using a data sample containing $657 \times 10^{6}$ $B \bar{B}$ events collected with the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider operating near the $Υ (4 S)$ resonance. We determine the total branching fraction of the decay, $B (B^{0} \to π^{-} ℓ^{+} ν) = (1.49 \pm 0.04 (stat) \pm 0.07 (syst)) \times 10^{- 4}$ . We also report a new precise measurement of the differential decay rate and extract the Cabibbo-Kobayashi-Maskawa matrix element $| V_{u b} |$ using model-independent and model-dependent approaches. From a simultaneous fit to the measured differential decay rate and lattice QCD results, we obtain $| V_{u b} | = (3.43 \pm 0.33) \times 10^{- 3}$ , where the error includes both experimental and theoretical uncertainties.

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References (38)

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Measurement of the decay $B^{0} \to π^{-} ℓ^{+} ν$ and determination of $| V_{u b} |$

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

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Measurement of the decay $B^{0} \to π^{-} ℓ^{+} ν$ and determination of $| V_{u b} |$