Measurement of the decay B⁰toπ^-ell^+ν and determination of |V_{ub}|

H. Ha , E. Won , I. Adachi , H. Aihara , T. Aziz , A. M. Bakich , V. Balagura , E. Barberio

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A. Bay K. Belous V. Bhardwaj B. Bhuyan M. Bischofberger A. Bondar A. Bozek M. Bracko T. E. Browder Y. Chao A. Chen P. Chen B. G. Cheon C.-C. Chiang I.-S. Cho K. Cho K.-S. Choi Y. Choi J. Dalseno M. Danilov Z. Dolezal A. Drutskoy W. Dungel S. Eidelman N. Gabyshev B. Golob J. Haba K. Hayasaka H. Hayashii Y. Horii Y. Hoshi W.-S. Hou Y. B. Hsiung H. J. Hyun T. Iijima K. Inami R. Itoh M. Iwabuchi Y. Iwasaki N. J. Joshi T. Julius J. H. Kang T. Kawasaki C. Kiesling H. J. Kim H. O. Kim M. J. Kim S. K. Kim Y. J. Kim K. Kinoshita B. R. Ko S. Korpar P. Krizan T. Kuhr T. Kumita A. Kuzmin Y.-J. Kwon S.-H. Kyeong J. S. Lange M. J. Lee S.-H. Lee Y. Li A. Limosani C. Liu Y. Liu D. Liventsev R. Louvot S. McOnie K. Miyabayashi H. Miyata Y. Miyazaki G. B. Mohanty T. Mori Y. Nagasaka E. Nakano M. Nakao H. Nakazawa Z. Natkaniec S. Neubauer S. Nishida K. Nishimura O. Nitoh T. Nozaki S. Ogawa T. Ohshima S. Okuno S. L. Olsen P. Pakhlov G. Pakhlova C. W. Park H. Park H. K. Park R. Pestotnik M. Petric L. E. Piilonen M. Rohrken S. Ryu H. Sahoo Y. Sakai O. Schneider C. Schwanda A. J. Schwartz K. Senyo M. E. Sevior M. Shapkin C. P. Shen J.-G. Shiu F. Simon P. Smerkol Y.-S. Sohn A. Sokolov S. Stanic M. Staric T. Sumiyoshi Y. Teramoto K. Trabelsi S. Uehara T. Uglov Y. Unno S. Uno S. E. Vahsen G. Varner K. E. Varvell A. Vossen C. H. Wang M.-Z. Wang P. Wang M. Watanabe Y. Watanabe Y. Yamashita Z. P. Zhang P. Zhou V. Zhulanov T. Zivko A. Zupanc

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classification ✦ hep-ex

keywords decaymeasurementtimesdifferentialmathrmrateapproachesasymmetric-energy

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We present a measurement of the charmless semileptonic decay $B^0\to\pi^-\ell^+\nu$ 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 $\Upsilon(4S)$ resonance. We determine the total branching fraction of the decay, $\mathcal{B}(B^0\to\pi^-\ell^+\nu)=(1.49\pm 0.04{(\mathrm{stat})}\pm 0.07{(\mathrm{syst})})\times 10^{-4}$. We also report a new precise measurement of the differential decay rate, and extract the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ using model-independent and -dependent approaches. From a simultaneous fit to the measured differential decay rate and lattice QCD results, we obtain $|V_{ub}|=(3.43\pm 0.33)\times 10^{-3}$, where the error includes both statistical and systematic uncertainties.

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