Observation of B+→D̄*0τ+ντ and evidence for B+→D̄0τ+ντ at Belle

A. Bozek, M. Rozanska, I. Adachi, H. Aihara, K. Arinstein, V. Aulchenko, T. Aushev, T. Aziz, A. M. Bakich, V. Bhardwaj, M. Bischofberger, A. Bondar, M. Bračko, T. E. Browder, Y. Chao, A. Chen, B. G. Cheon, I. S. Cho, K. S. Choi, Y. ChoiJ. Dalseno, Z. Doležal, Z. Drásal, A. Drutskoy, W. Dungel, S. Eidelman, P. Goldenzweig, B. Golob, H. Ha, K. Hara, Y. Hasegawa, H. Hayashii, T. Higuchi, Y. Horii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, K. Inami, M. Iwabuchi, Y. Iwasaki, N. J. Joshi, J. H. Kang, P. Kapusta, H. Kawai, T. Kawasaki, H. Kichimi, C. Kiesling, H. O. Kim, J. H. Kim, M. J. Kim, S. K. Kim, Y. J. Kim, B. R. Ko, S. Korpar, P. Krišan, P. Krokovny, T. Kuhr, T. Kumita, A. Kuzmin, Y. J. Kwon, S. H. Kyeong, M. J. Lee, S. H. Lee, J. Li, D. Liventsev, R. Louvot, A. Matyja, S. McOnie, H. Miyata, Y. Miyazaki, R. Mizuk, G. B. Mohanty, E. Nakano, M. Nakao, H. Nakazawa, S. Neubauer, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, S. Okuno, S. L. Olsen, W. Ostrowicz, P. Pakhlov, G. Pakhlova, C. W. Park, H. K. Park, R. Pestotnik, M. Petrič, L. E. Piilonen, H. Sahoo, Y. Sakai, O. Schneider, J. Schümann, C. Schwanda, A. J. Schwartz, K. Senyo, J. G. Shiu, B. Shwartz, R. Sinha, P. Smerkol, A. Sokolov, E. Solovieva, M. Starič, J. Stypula, T. Sumiyoshi, G. N. Taylor, Y. Teramoto, I. Tikhomirov, K. Trabelsi, S. Uehara, Y. Unno, S. Uno, G. Varner, K. E. Varvell, K. Vervink, C. H. Wang, M. Z. Wang, P. Wang, Y. Watanabe, R. Wedd, E. Won, B. D. Yabsley, Y. Yamashita, V. Zhulanov, T. Zivko, A. Zupanc

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Abstract

We present measurements of B+→D̄ *0τ+ντ and B+→D̄0τ+ντ decays in a data sample of 657×106 BB̄ pairs collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. We find 446-56+58 B+→D̄*0τ+ντ events with a significance of 8.1 standard deviations, and 146-41+42 B+→D̄0τ+ν τ events with a significance of 3.5 standard deviations. The latter signal provides the first evidence for this decay mode. The measured branching fractions are B(B+→D̄*0τ+ντ)=(2. 12-0.27+0.28(stat)±0.29(syst))% and B(B+→D̄0τ+ν τ)=(0.77±0.22(stat)±0.12(syst))%.

Original languageEnglish
Article number072005
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume82
Issue number7
DOIs
StatePublished - 11 Oct 2010

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