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  • Evidence for semileptonic B...
    Wang, M.-Z.; Adachi, I.; Asner, D. M.; Aulchenko, V.; Bhuyan, B.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, P.; Chen, P.; Chistov, R.; Cho, K.; Chobanova, V.; Cinabro, D.; Dalseno, J.; Danilov, M.; Drásal, Z.; Eidelman, S.; Ferber, T.; Ganguly, S.; Gillard, R.; Goh, Y. M.; Golob, B.; Hayashii, H.; Hoshi, Y.; Hou, W.-S.; Hyun, H. J.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Julius, T.; Kato, E.; Kawasaki, T.; Kichimi, H.; Kim, D. Y.; Kim, H. J.; Kim, J. B.; Ko, B. R.; Kodyš, P.; Korpar, S.; Krokovny, P.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Y.-J.; Lee, S.-H.; Li, J.; Libby, J.; Liu, C.; Liventsev, D.; Lukin, P.; Miyabayashi, K.; Mohanty, G. B.; Mussa, R.; Nakano, E.; Nakao, M.; Natkaniec, Z.; Nedelkovska, E.; Ng, C.; Nishida, S.; Ogawa, S.; Okuno, S.; Ostrowicz, W.; Park, C. W.; Park, H.; Park, H. K.; Pestotnik, R.; Ritter, M.; Röhrken, M.; Rostomyan, A.; Sahoo, H.; Sandilya, S.; Santel, D.; Savinov, V.; Schneider, O.; Sevior, M. E.; Shen, C. P.; Shiu, J.-G.; Sibidanov, A.; Sokolov, A.; Steder, M.; Tanida, K.; Uchida, M.; Uehara, S.; Uno, S.; Urquijo, P.; Vahsen, S. E.; Van Hulse, C.; Varvell, K. E.; Vinokurova, A.; Vorobyev, V.; Wagner, M. N.; Wang, C. H.; Watanabe, M.; Watanabe, Y.; Won, E.; Yamaoka, J.; Yamashita, Y.; Zhang, Z. P.; Zhilich, V.

    Physical review. D, Particles, fields, gravitation, and cosmology, 1/2014, Letnik: 89, Številka: 1
    Journal Article

    We find evidence for the semileptonic baryonic decay B-→pp¯ℓ-ν¯ℓ (ℓ=e, μ), based on a data sample of 772 million BB¯ 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-→pp¯ℓ-ν¯ℓ is measured to be (5.8+2.4-2.1(stat)±0.9(syst))×10-6 with a significance of 3.2σ, where lepton universality is assumed. We also estimate the corresponding upper limit: B(B-→pp¯ℓ-ν¯ℓ)<9.6×10-6 at the 90% confidence level. This measurement helps constrain the baryonic transition form factor in B decays