Evidence for Semileptonic B- to p pbar l nubar Decays
Creators: name: Tien, K. -J.
name: Wang, M. -Z.
name: Adachi, I.
name: Aihara, H.
name: Asner, D. M.
name: Aulchenko, V.
name: Aushev, T.
name: Bakich, A. M.
name: Bala, A.
name: Bhuyan, B.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Chang, P.
name: Chekelian, V.
name: Chen, A.
name: Chen, P.
name: Cheon, B. G.
name: Chilikin, K.
name: Chistov, R.
name: Cho, I. -S.
name: Cho, K.
name: Chobanova, V.
name: Choi, Y.
name: Cinabro, D.
name: Dalseno, J.
name: Danilov, M.
name: Doležal, Z.
name: Drásal, Z.
name: Dutta, D.
name: Eidelman, S.
name: Farhat, H.
name: Fast, J. E.
name: Ferber, T.
name: Gaur, V.
name: Ganguly, S.
name: Gillard, R.
name: Goh, Y. M.
name: Golob, B.
name: Haba, J.
name: Hayashii, H.
name: Horii, Y.
name: Hoshi, Y.
name: Hou, W. -S.
name: Hsiung, Y. B.
name: Huschle, M.
name: Hyun, H. J.
name: Iijima, T.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, Y.
name: Julius, T.
name: Kah, D. H.
name: Kang, J. H.
name: Kato, E.
name: Kawasaki, T.
name: Kichimi, H.
name: Kiesling, C.
name: Kim, D. Y.
name: Kim, H. J.
name: Kim, J. B.
name: Kim, J. H.
name: Kim, Y. J.
name: Klucar, J.
name: Ko, B. R.
name: Kodyš, P.
name: Korpar, S.
name: Križan, P.
name: Krokovny, P.
name: Kronenbitter, B.
name: Kuhr, T.
name: Kumita, T.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lee, S. -H.
name: Li, J.
name: Li, Y.
name: Libby, J.
name: Liu, C.
name: Liu, Y.
name: Liventsev, D.
name: Lukin, P.
name: Miyabayashi, K.
name: Miyata, H.
name: Mohanty, G. B.
name: Moll, A.
name: Mussa, R.
name: Nakano, E.
name: Nakao, M.
name: Natkaniec, Z.
name: Nayak, M.
name: Nedelkovska, E.
name: Ng, C.
name: Nisar, N. K.
name: Nishida, S.
name: Nitoh, O.
name: Ogawa, S.
name: Okuno, S.
name: Olsen, S. L.
name: Ostrowicz, W.
name: Oswald, C.
name: Park, C. W.
name: Park, H.
name: Park, H. K.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Petrič, M.
name: Piilonen, L. E.
name: Ritter, M.
name: Röhrken, M.
name: Rostomyan, A.
name: Sahoo, H.
name: Saito, T.
name: Sakai, Y.
name: Sandilya, S.
name: Santel, D.
name: Santelj, L.
name: Sanuki, T.
name: Sato, Y.
name: Savinov, V.
name: Schneider, O.
name: Schnell, G.
name: Schwanda, C.
name: Semmler, D.
name: Senyo, K.
name: Seon, O.
name: Sevior, M. E.
name: Shapkin, M.
name: Shen, C. P.
name: Shibata, T. -A.
name: Shiu, J. -G.
name: Sibidanov, A.
name: Sohn, Y. -S.
name: Sokolov, A.
name: Stanič, S.
name: Starič, M.
name: Steder, M.
name: Sumihama, M.
name: Sumiyoshi, T.
name: Tanida, K.
name: Tatishvili, G.
name: Teramoto, Y.
name: Uchida, M.
name: Uehara, S.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Urquijo, P.
name: Vahsen, S. E.
name: Van Hulse, C.
name: Vanhoefer, P.
name: Varner, G.
name: Varvell, K. E.
name: Vinokurova, A.
name: Vorobyev, V.
name: Wagner, M. N.
name: Wang, C. H.
name: Wang, P.
name: Watanabe, M.
name: Watanabe, Y.
name: Williams, K. M.
name: Won, E.
name: Yamaoka, J.
name: Yamashita, Y.
name: Yashchenko, S.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhulanov, V.
name: Zupanc, A.
Publisher: name: arXiv
Year: 2013
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We find evidence for the semileptonic baryonic decay $B^-\to p\bar p\ell^-\barν_\ell$ ($\ell=e,μ$), based on a data sample of 772 million $B\bar B$ pairs collected at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy electron-positron collider. A neural-network based hadronic $B$-meson tagging method is used in this study. The branching fraction of $B^-\to p\bar p\ell^-\barν_\ell$ is measured to be $(5.8^{+2.4}_{-2.1}\textrm{(stat.)}\pm 0.9\textrm{(syst.)})\times 10^{-6}$ with a significance of 3.2$σ$, where lepton universality is assumed. We also estimate the corresponding upper limit: $\mathcal{B}(B^-\to p\bar p\ell^-\barν_\ell) &lt; 9.6\times 10^{-6}$ at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays.
description: 12 pages, 4 figures, submitted to Phys.Rev.Lett