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Ha, H. Hayashii, H. J. Hyun, H. J. Kim, H. K. Park, H. Miyata, H. Nakazawa, H. O. Kim, H. Park, H. Sahoo, I. Adachi, I.-S. Cho, J. Dalseno, J.-G. Shiu, J. Haba, J. H. Kang, J. S. Lange, K. Belous, K. Cho, K. E. Varvell, K. Hayasaka, K. Inami, K. Kinoshita, K. Miyabayashi, K. Nishimura, K.-S. Choi, K. Senyo, K. Trabelsi, L. E. Piilonen, M. Bischofberger, M. Bracko, M. Danilov, M. E. Sevior, M. Iwabuchi, M. J. Kim, M. J. Lee, M. Nakao, M. Petric, M. Rohrken, M. Shapkin, M. Staric, M. Watanabe, M.-Z. Wang, N. Gabyshev, N. J. Joshi, O. Nitoh, O. Schneider, P. Chen, P. Krizan, P. Pakhlov, P. Smerkol, P. Wang, P. Zhou, R. Itoh, R. Louvot, R. Pestotnik, S. Eidelman, S. E. Vahsen, S.-H. Kyeong, S.-H. Lee, S. K. Kim, S. Korpar, S. L. Olsen, S. McOnie, S. Neubauer, S. Nishida, S. Ogawa, S. Okuno, S. Ryu, S. Stanic, S. Uehara, S. Uno, T. Aziz, T. E. Browder, T. Iijima, T. Julius, T. Kawasaki, T. Kuhr, T. Kumita, T. Mori, T. Nozaki, T. Ohshima, T. Sumiyoshi, T. Uglov, T. Zivko, V. Balagura, V. Bhardwaj, V. Zhulanov, W. Dungel, W.-S. Hou, Y. B. Hsiung, Y. Chao, Y. Choi, Y. Horii, Y. Hoshi, Y. Iwasaki, Y. J. Kim, Y.-J. Kwon, Y. Li, Y. Liu, Y. Miyazaki, Y. Nagasaka, Y. Sakai, Y.-S. Sohn, Y. Teramoto, Y. Unno, Y. Watanabe, Y. Yamashita, Z. Dolezal, Z. Natkaniec, Z. P. Zhang","submitted_at":"2010-12-01T03:58:49Z","abstract_excerpt":"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, $\\mathcal{B}(B^0\\to\\pi^-\\ell^+\\nu)=(1.49\\pm 0.04{(\\mathrm{stat})}\\pm 0.07{(\\mathrm{syst})})\\times 10^{-4}$. 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