BackSearch for B- -> mu(-)(nu)over-bar(mu) Decays at the Belle Experiment
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Date
2018-07-18Author
Sibidanov, A.
Varvell, K. E.
Adachi, I.
Aihara, H.
Al Said, S.
Garmash, A.
Goldenzweig, P.
Greenwald, D.
Asner, D. M.
Aushev, T.
Ayad, R.
Babu, V.
Badhrees, I.
Bahinipati, S.
Bakich, A. M.
Bansal, V.
Barberio, E.
Behera, P.
Bhuyan, B.
Biswal, J.
Bozek, A.
Bracko, M.
Browder, T. E.
Cervenkov, D.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Cho, K.
Choi, S. K.
Choi, Y.
Cinabro, D.
Czank, T.
Dash, N.
Di Carlo, S.
Dolezal, Z.
Drasal, Z.
Dutta, D.
Eidelman, S.
Epifanov, D.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Gaur, V.
Gabyshev, N.
Guan, Y.
Guido, E.
Haba, J.
Hayasaka, K.
Hayashii, H.
Hedges, M. T.
Hirose, S.
Hou, W. S.
Hsu, C. L.
Iijima, T.
Inami, K.
Inguglia, G.
Ishikawa, A.
Itoh, R.
Iwasaki, M.
Iwasaki, Y.
Jacobs, W. W.
Jaegle, I.
Jeon, H. B.
Jin, Y.
Joo, K. K.
Julius, T.
Kahn, J.
Kaliyar, A. B.
Kang, K. H.
Karyan, G.
Kawasaki, T.
Kiesling, C.
Kim, D. Y.
Kim, J. B.
Kim, S. H.
Kim, Y. J.
Kinoshita, K.
Kodys, P.
Korpar, S.
Kotchetkov, D.
Krizan, P.
Krokovny, P.
Kuhr, T.
Kulasiri, R.
Kumar, R.
Kuzmin, A.
Kwon, Y. J.
Lange, J. S.
Lee, I. S.
Li, C. H.
Li, L.
Gioi, L. Li
Libby, J.
Liventsev, D.
Lubej, M.
Luo, T.
Masuda, M.
Matsuda, T.
Merola, M.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
Mohanty, G. B.
Moon, H. K.
Mori, T.
Mussa, R.
Nakano, E.
Nakao, M.
Nanut, T.
Nath, K. J.
Natkaniec, Z.
Nayak, M.
Niiyama, M.
Nisar, N. K.
Nishida, S.
Ogawa, S.
Okuno, S.
Ono, H.
Pakhlov, P.
Pakhlova, G.
Pal, B.
Park, C. S.
Park, C. W.
Park, H.
Paul, S.
Pedlar, T. K.
Pestotnik, R.
Piilonen, L. E.
Ritter, M.
Rostomyan, A.
Rozanska, M.
Sakai, Y.
Salehi, M.
Sandilya, S.
Sato, Y.
Savinov, V.
Schneider, O.
Schnell, Gunar
Schwanda, C.
Seino, Y.
Senyo, K.
Sevior, M. E.
Shebalin, V.
Shen, C. P.
Shibata, T. A.
Shiu, J. G.
Simon, F.
Sokolov, A.
Solovieva, E.
Staric, M.
Strube, J. F.
Stypula, J.
Sumihama, M.
Sumisawa, K.
Sumiyoshi, T.
Takizawa, M.
Tamponi, U.
Tanida, K.
Tenchini, F.
Trabelsi, K.
Uchida, M.
Uehara, S.
Uglov, T.
Unno, Y.
Uno, S.
Urquijo, P.
Van Hulse, Charlotte Barbara
Varner, G.
Vorobyev, V.
Wang, C. H.
Wang, M. Z.
Wang, P.
Watanabe, M.
Watanuki, S.
Widmann, E.
Won, E.
Yamashita, Y.
Ye, H.
Yelton, J.
Yuan, C. Z.
Yusa, Y.
Zhang, Z. P.
Zhilich, V.
Zhukova Zhukova, Valentina 
Zhulanov, V.
Zupanc, A.
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Physical Review Letters 121 : (2018) // Article ID 031801
Abstract
We report the results of a search for the rare, purely leptonic decay B- -> mu(-)(nu) over bar (mu) performed with a 711 fb(-1) data sample that contains 772 x 10(6) B (B) over bar pairs, collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. The signal events are selected based on the presence of a high momentum muon and the topology of the rest of the event showing properties of a generic B-meson decay, as well as the missing energy and momentum being consistent with the hypothesis of a neutrino from the signal decay. We find a 2.4 standard deviation excess above background including systematic uncertainties, which corresponds to a branching fraction of B(B- -> mu(-)(nu) over bar (mu)) = (6.46 +/- 2.22 +/- 1.60) x 10(-7) or a frequentist 90% confidence level interval on the B- -> mu(-)(nu) over bar (mu) branching fraction of [2.9, 10.7] x 10(-7).
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