Evidence forB−→τ−ν¯τwith a semileptonic tagging method

K. Hara,T. Iijima,H. Aihara, V. Aulchenko,T. Aushev,T. Aziz,A. M. Bakich,E. Barberio, K. Belous, M. Bischofberger, A. Bondar, A. Bozek, M. Bračko,T. E. Browder,P. Chang, Y. Chao,A. Chen, B. G. Cheon,C.-C. Chiang,I.-S. Cho,Y. Choi,J. Dalseno, M. Danilov,Z. Doležal, W. Dungel,S. Eidelman, N. Gabyshev, P. Goldenzweig,B. Golob, H. Ha, Y. Hasegawa,K. Hayasaka, H. Hayashii,Y. Horii, Y. Hoshi,Y. B. Hsiung, H. J. Hyun, K. Inami, M. Iwabuchi, Y. Iwasaki, T. Julius,J. H. Kang,H. Kawai, T. Kawasaki,H. Kichimi, C. Kiesling,H. J. Kim,H. O. Kim,J. H. Kim,M. J. Kim,Y. J. Kim,K. Kinoshita,B. R. Ko,P. Kodyš,S. Korpar, M. Kreps,P. Križan,P. Krokovny, T. Kuhr,T. Kumita,A. Kuzmin,Y.-J. Kwon,S.-H. Kyeong,M. J. Lee,S.-H. Lee,J. Li, A. Limosani,Y. Liu,D. Liventsev, R. Louvot, A. Matyja,S. McOnie,K. Miyabayashi,H. Miyata, Y. Miyazaki,G. B. Mohanty, T. Mori, E. Nakano, M. Nakao,H. Nakazawa, S. Neubauer,S. Nishida,K. Nishimura,O. Nitoh, T. Nozaki,S. Ogawa,T. Ohshima, S. Okuno,S. L. Olsen, H. Ozaki,G. Pakhlova, C. W. Park,H. K. Park, R. Pestotnik, M. Petrič,L. E. Piilonen, M. Prim,M. Rozanska,S. Ryu, H. Sahoo,Y. Sakai,O. Schneider,J. Schümann,C. Schwanda, A. J. Schwartz,K. Senyo,M. E. Sevior,M. Shapkin, H. Shibuya, J.-G. Shiu, B. Shwartz,J. B. Singh, P. Smerkol,E. Solovieva, S. Stanič,M. Starič,K. Sumisawa,T. Sumiyoshi, Y. Teramoto,I. Tikhomirov,K. Trabelsi,S. Uehara,T. Uglov,Y. Unno,S. Uno,Y. Ushiroda, 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, M. Yamauchi,C. Z. Yuan, C. C. Zhang,V. Zhilich, T. Zivko, A. Zupanc, O. Zyukova

Physical Review D（2010）

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摘要

We present a measurement of the decay B- -> tau- nu_bar using a data sample containing 657 million BB_bar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of BB_bar pairs are tagged by reconstructing one B meson decaying semileptonically. We detect the B- -> tau- nu_bar candidate in the recoil. We obtain a signal with a significance of 3.6 standard deviations including systematic uncertainties, and measure the branching fraction to be Br(B- -> tau- nu_bar) = [1.54+0.38-0.37(stat)+0.29-0.31(syst)]*10^-4. This result confirms the evidence for B- -> tau- nu_bar obtained in a previous Belle measurement that used a hadronic B tagging method.

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