Belle CollaborationBeleno, C.Dingfelder, J.Urquijo, P.Aihara, H.Al Said, S.Asner, D. M.Aushev, T.Ayad, R.Babu, V.Badhrees, I.Bakich, A. M.Bansal, V.Behera, P.Bhuyan, B.Biswal, J.Bobrov, A.Bracko, M.Browder, T. E.Cervenkov, D.Chen, A.Cheon, B. G.Chistov, R.Cho, K.Choi, S. -K.Choi, Y.Cinabro, D.Dash, N.Di Carlo, S.Dolezal, Z.Eidelman, S.Farhat, H.Fast, J. E.Ferber, T.Frey, A.Fulsom, B. G.Gaur, V.Gabyshev, N.Garmash, A.Gillard, R.Goldenzweig, P.Hara, T.Hayashii, H.Hedges, M. T.Hou, W. -S.Iijima, T.Inami, K.Inguglia, G.Ishikawa, A.Itoh, R.Iwasaki, Y.Jeon, H. B.Jin, Y.Joffe, D.Joo, K. K.Kang, K. H.Karyan, G.Kim, D. Y.Kim, J. B.Kim, K. T.Kim, M. J.Kim, Y. J.Kinoshita, K.Kodys, P.Korpar, S.Kotchetkov, D.Krizan, P.Krokovny, P.Kulasiri, R.Lee, I. S.Li, Y.Gioi, L. LiLibby, J.Liventsev, D.Lubej, M.Luo, T.Masuda, M.Matsuda, T.Matvienko, D.Miyabayashi, K.Miyata, H.Moon, H. K.Mori, T.Nakano, E.Nakao, M.Nanut, T.Nath, K. J.Nayak, M.Nishida, S.Ogawa, S.Okuno, S.Ono, H.Pal, B.Park, C. -S.Park, C. W.Park, H.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Ritter, M.Sakai, Y.Salehi, M.Sandilya, S.Sanuki, T.Schneider, O.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Seon, O.Sevior, M. E.Shebalin, V.Shibata, T. -A.Shiu, J. -G.Simon, F.Solovieva, E.Staric, M.Sumiyoshi, T.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Uchida, M.Uglov, T.Unno, Y.Uno, S.Usov, Y.Van Hulse, C.Varner, G.Varvell, K. E.Vinokurova, A.Vorobyev, V.Wang, C. H.Wang, M. -Z.Wang, P.Watanabe, Y.Widmann, E.Won, E.Yamashita, Y.Ye, H.Yelton, J.Yook, Y.Zhang, Z. P.Zhilich, V.Zhukova, V.Zhulanov, V.Zupanc, A.2018-01-152018-01-152018-01-15201710.1103/PhysRevD.96.091102https://infoscience.epfl.ch/handle/20.500.14299/144115WOS:000416315000001We report branching fraction measurements of the decays B+ -> eta l(+)v(l) and B+ -> eta'l(+)v(l) based on 711 fb(-1) of data collected near the (sic)(4S) resonance with the Belle experiment at the KEKB asymmetric-energy e(+)e(-) collider. This data sample contains 772 million B (B) over bar events. One of the two B mesons is fully reconstructed in a hadronic decay mode. Among the remaining ("signal-B") daughters, we search for the eta meson in two decay channels, eta -> gamma gamma and eta -> pi(+)pi(-)pi(0), and reconstruct the eta' meson in eta' -> eta pi(+)pi(-) with subsequent decay of the eta into gamma gamma Combining the two. modes and using an extended maximum likelihood, the B+ -> eta l(+)v(l) branching fraction is measured to be (4.2 +/- 1.1 (stat.) +/- 0.3 (syst.)) x 10(-5). For B+ -> eta l(+)v(l),we observe no significant signal and set an upper limit of 0.72 x 10(-4) at 90% confidence level.text::journal::journal article::research article