Evidence for $B^{-}\to {\tau }^{-}{\overline{\nu }}_{\tau }$ with a Hadronic Tagging Method Using the Full Data Sample of Belle

Journal Article · Mon Mar 25 00:00:00 EDT 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.110.131801· OSTI ID:1594533

Hara, K.; Horii, Y.; Iijima, T.; Adachi, I.; Aihara, H.; Asner, D. M.; Aushev, T.; Aziz, T.; Bakich, A. M.; Barrett, M.; Bhardwaj, V.; Bhuyan, B.; Bondar, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Chekelian, V.; Chen, A.; Chen, P. ; Cheon, B. G.; Chilikin, K.; Cho, I. -S.; Cho, K.; Choi, Y.; Cinabro, D.; Dalseno, J.; Dingfelder, J.; Doležal, Z.; Drásal, Z.; Drutskoy, A.; Dutta, D.; Eidelman, S.; Epifanov, D.; Esen, S.; Farhat, H.; Frey, A.; Gaur, V.; Gabyshev, N.; Ganguly, S.; Gillard, R.; Goh, Y. M.; Golob, B.; Haba, J.; Hara, T.; Hayasaka, K.; Hayashii, H.; Higuchi, T.; Hoshi, Y.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, Y.; Iwashita, T.; Julius, T.; Kang, J. H.; Kawasaki, T.; Kiesling, C.; Kim, H. O.; Kim, J. B.; Kim, J. H.; Kim, K. T.; Kim, M. J.; Kim, Y. J.; Kinoshita, K.; Klucar, J.; Ko, B. R.; Kodyš, P.; Korpar, S.; Kouzes, R. T.; Križan, P.; Krokovny, P.; Kronenbitter, B.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Y. -J.; Lange, J. S.; Lee, S. -H.; Li, J.; Li, Y.; Libby, J.; Liu, C.; Liu, Y.; Liu, Z. Q.; Liventsev, D.; Matvienko, D.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Moll, A.; Mori, T.; Muramatsu, N.; Nakano, E.; Nakao, M.; Nakazawa, H.; Natkaniec, Z.; Nayak, M.; Ng, C.; Nisar, N. K.; Nishida, S.; Nishimura, K.; Nitoh, O.; Nozaki, T.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Oswald, C.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Prim, M.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, K.; Sakai, Y.; Sandilya, S.; Santel, D.; Sanuki, T.; Sato, Y.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibata, T. -A.; Shiu, J. -G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Smerkol, P.; Sohn, Y. -S.; Sokolov, A.; Solovieva, E.; Starič, M.; Sumihama, M.; Sumiyoshi, T.; Tatishvili, G.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Uchida, M.; Uehara, S.; Unno, Y.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Usov, Y.; Van Hulse, C.; Vanhoefer, P.; Varner, G.; Varvell, K. E.; Vorobyev, V.; Wagner, M. N.; Wang, C. H.; Wang, M. -Z.; Wang, P.; Watanabe, M.; Watanabe, Y.; Williams, K. M.; Won, E.; Yabsley, B. D.; Yamamoto, H.; Yamashita, Y.; Yusa, Y.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

In this work, we measure the branching fraction of $B^{-}\to {\tau }^{-}{\overline{\nu }}_{\tau }$ using the full ${\rm Y}\left(4S\right)$ data sample containing $772\times {10}^6$ $B\overline{B}$ pairs collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. Events with $B\overline{B}$ pairs are tagged by reconstructing one of the $B$ mesons decaying into hadronic final states, and $B^{-}\to {\tau }^{-}{\overline{\nu }}_{\tau }$ candidates are detected in the recoil. We discover evidence for $B^{-}\to {\tau }^{-}{\overline{\nu }}_{\tau }$ with a significance of 3.0 standard deviations including systematic errors and measure a branching fraction $\mathcal{B}(B^{-}\to {\tau }^{-}{\overline{\nu }}_{\tau })=\left[{0.72}_{-0.25}^{+0.27}\right(\mathrm{stat})\pm 0.11(\mathrm{syst}\left)\right]\times {10}^{-4}$.

• Research Organization: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• Contributing Organization: Belle Collaboration
• Grant/Contract Number: SC0009973
• OSTI ID: 1594533
• Alternate ID(s): OSTI ID: 1103959
• Journal Information: Physical Review Letters, Vol. 110, Issue 13; ISSN 0031-9007
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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