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arXiv · 1012.0090

Measurement of the decay $B^0\to\pi^-\ell^+\nu$ and determination of $|V_{ub}|$

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

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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H. Ha, E. Won, I. Adachi, H. Aihara, T. Aziz, A. M. Bakich, V. Balagura, E. Barberio, 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. 2010-12-01. Measurement of the decay $B^0\to\pi^-\ell^+\nu$ and determination of $|V_{ub}|$. https://doi.org/10.1103/physrevd.83.071101

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