Evidence of the purely leptonic decay B- --> tau- nu(tau)

K Ikado; K Abe; K Abe; I Adachi; H Aihara; K Akai; M Akemoto; D Anipko; K Arinstein; V Aulchenko; T Aushev; T Aziz; A M Bakich; V Balagura; M Barbero; A Bay; I Bedny; K Belous; U Bitenc; I Bizjak; A Bondar; A Bozek; M Bracko; T E Browder; P Chang; A Chen; W T Chen; Y Choi; S Cole; J Dalseno; M Danilov; M Dash; S Eidelman; D Epifanov; J Flanagan; S Fratina; K Furukawa; N Gabyshev; T Gershon; A Go; G Gokhroo; B Golob; A Gorisek; H Ha; J Haba; K Hara; T Hara; N C Hastings; K Hayasaka; H Hayashii; M Hazumi; L Hinz; T Hokuue; Y Hoshi; S Hou; W-S Hou; N Iida; T Iijima; A Imoto; K Inami; A Ishikawa; H Ishino; R Itoh; M Iwasaki; Y Iwasaki; T Kamitani; J H Kang; S U Kataoka; N Katayama; H Kawai; T Kawasaki; H Kichimi; E Kikutani; H J Kim; H O Kim; K Kinoshita; H Koiso; S Korpar; P Krizan; P Krokovny; R Kulasiri; R Kumar; C C Kuo; A Kuzmin; Y-J Kwon; J S Lange; G Leder; J Lee; T Lesiak; A Limosani; S-W Lin; D Liventsev; D Marlow; T Matsumoto; A Matyja; S McOnie; S Michizono; T Mimashi; W Mitaroff; K Miyabayashi; H Miyata; Y Miyazaki; R Mizuk; T Nagamine; I Nakamura; T T Nakamura; E Nakano; M Nakao; S Nishida; O Nitoh; S Noguchi; T Nozaki; S Ogawa; Y Ogawa; K Ohmi; T Ohshima; N Ohuchi; K Oide; T Okabe; S Okuno; S L Olsen; Y Onuki; W Ostrowicz; H Ozaki; P Pakhlov; C W Park; H Park; R Pestotnik; L E Piilonen; A Poluektov; M Rozanska; Y Sakai; T Schietinger; O Schneider; C Schwanda; K Senyo; M E Sevior; M Shapkin; H Shibuya; T Shidara; B Shwartz; V Sidorov; A Sokolov; A Somov; S Stanic; M Staric; H Stoeck; K Sumisawa; T Sumiyoshi; S Suzuki; O Tajima; F Takasaki; K Tamai; N Tamura; M Tanaka; M Tawada; G N Taylor; Y Teramoto; X C Tian; K Trabelsi; T Tsuboyama; T Tsukamoto; S Uehara; T Uglov; K Ueno; Y Unno; S Uno; Y Usov; G Varner; S Villa; C C Wang; C H Wang; Y Watanabe; E Won; B D Yabsley; A Yamaguchi; Y Yamashita; M Yamauchi; M Yoshida; Y Yusa; L M Zhang; Z P Zhang; V Zhilich; D Zürcher; Belle Collaboration

doi:10.1103/PhysRevLett.97.251802

Evidence of the purely leptonic decay B- --> tau- nu(tau)

Phys Rev Lett. 2006 Dec 22;97(25):251802. doi: 10.1103/PhysRevLett.97.251802. Epub 2006 Dec 22.

Authors

K Ikado¹, K Abe, K Abe, I Adachi, H Aihara, K Akai, M Akemoto, D Anipko, K Arinstein, V Aulchenko, T Aushev, T Aziz, A M Bakich, V Balagura, M Barbero, A Bay, I Bedny, K Belous, U Bitenc, I Bizjak, A Bondar, A Bozek, M Bracko, T E Browder, P Chang, A Chen, W T Chen, Y Choi, S Cole, J Dalseno, M Danilov, M Dash, S Eidelman, D Epifanov, J Flanagan, S Fratina, K Furukawa, N Gabyshev, T Gershon, A Go, G Gokhroo, B Golob, A Gorisek, H Ha, J Haba, K Hara, T Hara, N C Hastings, K Hayasaka, H Hayashii, M Hazumi, L Hinz, T Hokuue, Y Hoshi, S Hou, W-S Hou, N Iida, T Iijima, A Imoto, K Inami, A Ishikawa, H Ishino, R Itoh, M Iwasaki, Y Iwasaki, T Kamitani, J H Kang, S U Kataoka, N Katayama, H Kawai, T Kawasaki, H Kichimi, E Kikutani, H J Kim, H O Kim, K Kinoshita, H Koiso, S Korpar, P Krizan, P Krokovny, R Kulasiri, R Kumar, C C Kuo, A Kuzmin, Y-J Kwon, J S Lange, G Leder, J Lee, T Lesiak, A Limosani, S-W Lin, D Liventsev, D Marlow, T Matsumoto, A Matyja, S McOnie, S Michizono, T Mimashi, W Mitaroff, K Miyabayashi, H Miyata, Y Miyazaki, R Mizuk, T Nagamine, I Nakamura, T T Nakamura, E Nakano, M Nakao, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, Y Ogawa, K Ohmi, T Ohshima, N Ohuchi, K Oide, T Okabe, S Okuno, S L Olsen, Y Onuki, W Ostrowicz, H Ozaki, P Pakhlov, C W Park, H Park, R Pestotnik, L E Piilonen, A Poluektov, M Rozanska, Y Sakai, T Schietinger, O Schneider, C Schwanda, K Senyo, M E Sevior, M Shapkin, H Shibuya, T Shidara, B Shwartz, V Sidorov, A Sokolov, A Somov, S Stanic, M Staric, H Stoeck, K Sumisawa, T Sumiyoshi, S Suzuki, O Tajima, F Takasaki, K Tamai, N Tamura, M Tanaka, M Tawada, G N Taylor, Y Teramoto, X C Tian, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, T Uglov, K Ueno, Y Unno, S Uno, Y Usov, G Varner, S Villa, C C Wang, C H Wang, Y Watanabe, E Won, B D Yabsley, A Yamaguchi, Y Yamashita, M Yamauchi, M Yoshida, Y Yusa, L M Zhang, Z P Zhang, V Zhilich, D Zürcher; Belle Collaboration

Affiliation

¹ Nagoya University, Nagoya.

PMID: 17280341
DOI: 10.1103/PhysRevLett.97.251802

Abstract

We present the first evidence of the decay B- --> tau- nu(tau), using 414 fb(-1) of data collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. Events are tagged by fully reconstructing one of the B mesons in hadronic modes. We detect the signal with a significance of 3.5 standard deviations including systematics and measure the branching fraction to be B(B- --> tau- nu(tau)) = (1.79(-0.49) +0.56(stat)(-0.51) +0.46(syst)) x 10(-4). This implies that fB = 0.229(-0.031) +0.036(stat)(-0.037) +0.034(syst) GeV and is the first direct measurement of this quantity.