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Adachi, I.; Al Said, S.; Asner, D. M.; Ayad, R.; Barberio, E.; Bhuyan, B.; Biswal, J.; Bračko, M.; Červenkov, D.; Chang, P.; Chilikin, K.; Choi, Y.; Drásal, Z.; Dutta, D.; Epifanov, D.; Ferber, T.; Fulsom, B. G.; Gaur, V.; Guan, Y.; Guido, E.; Hirose, S.; Hou, W.-S.; Hsu, C.-L.; Iijima, T.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W. W.; Jin, Y.; Julius, T.; Kaliyar, A. B.; Kawasaki, T.; Kiesling, C.; Kim, J. B.; Kodyš, P.; Korpar, S.; Križan, P.; Krokovny, P.; Kumar, R.; Kuzmin, A.; Kwon, Y.-J.; Lee, I. S.; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; Merola, M.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Moon, H. K.; Mori, T.; Nakano, E.; Nath, K. J.; Natkaniec, Z.; Nayak, M.; Okuno, S.; Ono, H.; Pakhlov, P.; Pal, B.; Park, C. W.; Park, H.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Ritter, M.; Rostomyan, A.; Rozanska, M.; Sandilya, S.; Sato, Y.; Schnell, G.; Schwanda, C.; Seino, Y.; Senyo, K.; Shebalin, V.; Shen, C. P.; Shibata, T.-A.; Shiu, J.-G.; Simon, F.; Solovieva, E.; Starič, M.; Sumihama, M.; Sumiyoshi, T.; Takizawa, M.; Tanida, K.; Uchida, M.; Uehara, S.; Uno, S.; Van Hulse, C.; Varner, G.; Wang, M.-Z.; Wang, P.; Watanuki, S.; Yamashita, Y.; Yelton, J.; Yuan, C. Z.; Zhilich, V.; Zhulanov, V.; Zupanc, A.
Physical review letters, 07/2018, Letnik: 121, Številka: 3Journal Article
We report the results of a search for the rare, purely leptonic decay B−→μ−ν¯μ performed with a 711 fb−1 data sample that contains 772×106 BB¯ pairs, collected near the ϒ(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−→μ−ν¯μ)=(6.46±2.22±1.60)×10−7 or a frequentist 90% confidence level interval on the B−→μ−ν¯μ branching fraction of 2.9,10.7×10−7.
