Ikado K, Abe K, Abe K, Adachi I, Aihara H, Akai K, Akemoto M, Anipko D, Arinstein K, Aulchenko V, Aushev T, Aziz T, Bakich A M, Balagura V, Barbero M, Bay A, Bedny I, Belous K, Bitenc U, Bizjak I, Bondar A, Bozek A, Bracko M, Browder T E, Chang P, Chen A, Chen W T, Choi Y, Cole S, Dalseno J, Danilov M, Dash M, Eidelman S, Epifanov D, Flanagan J, Fratina S, Furukawa K, Gabyshev N, Gershon T, Go A, Gokhroo G, Golob B, Gorisek A, Ha H, Haba J, Hara K, Hara T, Hastings N C, Hayasaka K, Hayashii H, Hazumi M, Hinz L, Hokuue T, Hoshi Y, Hou S, Hou W-S, Iida N, Iijima T, Imoto A, Inami K, Ishikawa A, Ishino H, Itoh R, Iwasaki M, Iwasaki Y, Kamitani T, Kang J H, Kataoka S U, Katayama N, Kawai H, Kawasaki T, Kichimi H, Kikutani E, Kim H J, Kim H O, Kinoshita K, Koiso H, Korpar S, Krizan P, Krokovny P, Kulasiri R, Kumar R, Kuo C C, Kuzmin A, Kwon Y-J, Lange J S, Leder G, Lee J, Lesiak T, Limosani A, Lin S-W, Liventsev D, Marlow D, Matsumoto T, Matyja A, McOnie S, Michizono S, Mimashi T, Mitaroff W, Miyabayashi K, Miyata H, Miyazaki Y, Mizuk R, Nagamine T, Nakamura I, Nakamura T T, Nakano E, Nakao M, Nishida S, Nitoh O, Noguchi S, Nozaki T, Ogawa S, Ogawa Y, Ohmi K, Ohshima T, Ohuchi N, Oide K, Okabe T, Okuno S, Olsen S L, Onuki Y, Ostrowicz W, Ozaki H, Pakhlov P, Park C W, Park H, Pestotnik R, Piilonen L E, Poluektov A, Rozanska M, Sakai Y, Schietinger T, Schneider O, Schwanda C, Senyo K, Sevior M E, Shapkin M, Shibuya H, Shidara T, Shwartz B, Sidorov V, Sokolov A, Somov A, Stanic S, Staric M, Stoeck H, Sumisawa K, Sumiyoshi T, Suzuki S, Tajima O, Takasaki F, Tamai K, Tamura N, Tanaka M, Tawada M, Taylor G N, Teramoto Y, Tian X C, Trabelsi K, Tsuboyama T, Tsukamoto T, Uehara S, Uglov T, Ueno K, Unno Y, Uno S, Usov Y, Varner G, Villa S, Wang C C, Wang C H, Watanabe Y, Won E, Yabsley B D, Yamaguchi A, Yamashita Y, Yamauchi M, Yoshida M, Yusa Y, Zhang L M, Zhang Z P, Zhilich V, Zürcher D
Nagoya University, Nagoya.
Phys Rev Lett. 2006 Dec 22;97(25):251802. doi: 10.1103/PhysRevLett.97.251802.
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.
我们利用KEKB非对称能量正负电子对撞机上的 Belle 探测器，在 Υ(4S)共振处收集的 414 fb⁻¹ 数据，给出了 B⁻→τ⁻ν(τ)衰变的首个证据。通过强子模式完全重建其中一个 B 介子来标记事件。我们在包含系统误差的情况下，以 3.5 个标准差的显著性检测到信号，并测量分支比为 B(B⁻→τ⁻ν(τ)) = (1.79(-0.49)+0.56(统计)(-0.51)+0.46(系统))×10⁻⁴。这意味着 fB = 0.229(-0.031)+0.036(统计)(-0.037)+0.034(系统) GeV，这是对该量的首次直接测量。
