Measurement of the decays B -> eta lv(l) and B -> eta ' lv(l) in fully reconstructed events at Belle

Beleno, 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. Li ; Libby, 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. ; Belle Collaboration

We 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.


Published in:
Physical Review D, 96, 9, 091102
Year:
2017
Publisher:
College Pk, Amer Physical Soc
ISSN:
2470-0010
Laboratories:




 Record created 2018-01-15, last modified 2018-12-03


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