Evidence for B-→τ-ν̄τ with 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. Kodyž; 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

doi:10.1103/PhysRevD.82.071101

Evidence for B^-→τ^-ν̄τ with 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. ChoY. 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. Kodyž, 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

Department of Physics

Research output: Contribution to journal › Article › peer-review

99 Citations (Scopus)

Abstract

We present a measurement of the decay B^-→τ ^-ν̄τ using a data sample containing 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. A sample of B⁺B^- pairs are tagged by reconstructing one B⁺ meson decaying semileptonically. We detect the B^-→τ ^-ν̄τ 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 B(B^-→τ ^-ν̄τ)=[1.54-0.37+0.38(stat)-0.31+0.29(syst)] ×10^-4. This result confirms the evidence for B ^-→τ^-ν̄τ obtained in a previous Belle measurement that used a hadronic B tagging method.

Original language	English
Article number	071101
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	82
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.82.071101
Publication status	Published - 2010 Oct 22

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

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10.1103/PhysRevD.82.071101

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Hara, K., Iijima, T., Aihara, H., Aulchenko, V., Aushev, T., Aziz, T., Bakich, A. M., Barberio, E., Belous, K., Bischofberger, M., Bondar, A., Bozek, A., Bračko, M., Browder, T. E., Chang, P., Chao, Y., Chen, A., Cheon, B. G., Chiang, C. C., ... Zyukova, O. (2010). Evidence for B^-→τ^-ν̄τ with a semileptonic tagging method. Physical Review D - Particles, Fields, Gravitation and Cosmology, 82(7), [071101]. https://doi.org/10.1103/PhysRevD.82.071101

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

In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 82, No. 7, 071101, 22.10.2010.

Research output: Contribution to journal › Article › peer-review

Hara, K, Iijima, T, Aihara, H, Aulchenko, V, Aushev, T, Aziz, T, Bakich, AM, Barberio, E, Belous, K, Bischofberger, M, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chang, P, Chao, Y, Chen, A, Cheon, BG, Chiang, CC, Cho, IS, Choi, Y, Dalseno, J, Danilov, M, Doležal, Z, Dungel, W, Eidelman, S, Gabyshev, N, Goldenzweig, P, Golob, B, Ha, H, Hasegawa, Y, Hayasaka, K, Hayashii, H, Horii, Y, Hoshi, Y, Hsiung, YB, Hyun, HJ, Inami, K, Iwabuchi, M, Iwasaki, Y, Julius, T, Kang, JH, Kawai, H, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, HJ, Kim, HO, Kim, JH, Kim, MJ, Kim, YJ, Kinoshita, K, Ko, BR, Kodyž, P, Korpar, S, Kreps, M, Križan, P, Krokovny, P, Kuhr, T, Kumita, T, Kuzmin, A, Kwon, YJ, Kyeong, SH, Lee, MJ, Lee, SH, Li, J, Limosani, A, Liu, Y, Liventsev, D, Louvot, R, Matyja, A, McOnie, S, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mohanty, GB, Mori, T, Nakano, E, Nakao, M, Nakazawa, H, Neubauer, S, Nishida, S, Nishimura, K, Nitoh, O, Nozaki, T, Ogawa, S, Ohshima, T, Okuno, S, Olsen, SL, Ozaki, H, Pakhlova, G, Park, CW, Park, HK, Pestotnik, R, Petrič, M, Piilonen, LE, Prim, M, Rozanska, M, Ryu, S, Sahoo, H, Sakai, Y, Schneider, O, Schümann, J, Schwanda, C, Schwartz, AJ, Senyo, K, Sevior, ME, Shapkin, M, Shibuya, H, Shiu, JG, Shwartz, B, Singh, JB, Smerkol, P, Solovieva, E, Stanič, S, Starič, M, Sumisawa, K, Sumiyoshi, T, Teramoto, Y, Tikhomirov, I, Trabelsi, K, Uehara, S, Uglov, T, Unno, Y, Uno, S, Ushiroda, Y, Varner, G, Varvell, KE, Vervink, K, Wang, CH, Wang, MZ, Wang, P, Watanabe, Y, Wedd, R, Won, E, Yabsley, BD, Yamashita, Y, Yamauchi, M, Yuan, CZ, Zhang, CC, Zhilich, V, Zivko, T, Zupanc, A & Zyukova, O 2010, 'Evidence for B^-→τ^-ν̄τ with a semileptonic tagging method', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 82, no. 7, 071101. https://doi.org/10.1103/PhysRevD.82.071101

Hara, K. ; Iijima, T. ; Aihara, H. ; Aulchenko, V. ; Aushev, T. ; Aziz, T. ; Bakich, A. M. ; Barberio, E. ; Belous, K. ; Bischofberger, M. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Browder, T. E. ; Chang, P. ; Chao, Y. ; Chen, A. ; Cheon, B. G. ; Chiang, C. C. ; Cho, I. S. ; Choi, Y. ; Dalseno, J. ; Danilov, M. ; Doležal, Z. ; Dungel, W. ; Eidelman, S. ; Gabyshev, N. ; Goldenzweig, P. ; Golob, B. ; Ha, H. ; Hasegawa, Y. ; Hayasaka, K. ; Hayashii, H. ; Horii, Y. ; Hoshi, Y. ; Hsiung, Y. B. ; Hyun, H. J. ; Inami, K. ; Iwabuchi, M. ; Iwasaki, Y. ; Julius, T. ; Kang, J. H. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kiesling, C. ; Kim, H. J. ; Kim, H. O. ; Kim, J. H. ; Kim, M. J. ; Kim, Y. J. ; Kinoshita, K. ; Ko, B. R. ; Kodyž, P. ; Korpar, S. ; Kreps, M. ; Križan, P. ; Krokovny, P. ; Kuhr, T. ; Kumita, T. ; Kuzmin, A. ; Kwon, Y. J. ; Kyeong, S. H. ; Lee, M. J. ; Lee, S. H. ; Li, J. ; Limosani, A. ; Liu, Y. ; Liventsev, D. ; Louvot, R. ; Matyja, A. ; McOnie, S. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mohanty, G. B. ; Mori, T. ; Nakano, E. ; Nakao, M. ; Nakazawa, H. ; Neubauer, S. ; Nishida, S. ; Nishimura, K. ; Nitoh, O. ; Nozaki, T. ; Ogawa, S. ; Ohshima, T. ; Okuno, S. ; Olsen, S. L. ; Ozaki, H. ; Pakhlova, G. ; Park, C. W. ; Park, H. K. ; Pestotnik, R. ; Petrič, M. ; Piilonen, L. E. ; Prim, M. ; Rozanska, M. ; Ryu, S. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Schümann, J. ; Schwanda, C. ; Schwartz, A. J. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shibuya, H. ; Shiu, J. G. ; Shwartz, B. ; Singh, J. B. ; Smerkol, P. ; Solovieva, E. ; Stanič, S. ; Starič, M. ; Sumisawa, K. ; Sumiyoshi, T. ; Teramoto, Y. ; Tikhomirov, I. ; Trabelsi, K. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Ushiroda, Y. ; Varner, G. ; Varvell, K. E. ; Vervink, K. ; Wang, C. H. ; Wang, M. Z. ; Wang, P. ; Watanabe, Y. ; Wedd, R. ; Won, E. ; Yabsley, B. D. ; Yamashita, Y. ; Yamauchi, M. ; Yuan, C. Z. ; Zhang, C. C. ; Zhilich, V. ; Zivko, T. ; Zupanc, A. ; Zyukova, O. / Evidence for B^-→τ^-ν̄τ with a semileptonic tagging method. In: Physical Review D - Particles, Fields, Gravitation and Cosmology. 2010 ; Vol. 82, No. 7.

@article{f5a38446b32d4e3f8d004279ef39e41f,

title = "Evidence for B-→τ-{\=ν}τ with a semileptonic tagging method",

abstract = "We present a measurement of the decay B-→τ -{\=ν}τ using a data sample containing 657×106 B{\=B} pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of B+B- pairs are tagged by reconstructing one B+ meson decaying semileptonically. We detect the B-→τ -{\=ν}τ 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 B(B-→τ -{\=ν}τ)=[1.54-0.37+0.38(stat)-0.31+0.29(syst)] ×10-4. This result confirms the evidence for B -→τ-{\=ν}τ obtained in a previous Belle measurement that used a hadronic B tagging method.",

author = "K. Hara and T. Iijima and H. Aihara and V. Aulchenko and T. Aushev and T. Aziz and Bakich, {A. M.} and E. Barberio and K. Belous and M. Bischofberger and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and P. Chang and Y. Chao and A. Chen and Cheon, {B. G.} and Chiang, {C. C.} and Cho, {I. S.} and Y. Choi and J. Dalseno and M. Danilov and Z. Dole{\v z}al and W. Dungel and S. Eidelman and N. Gabyshev and P. Goldenzweig and B. Golob and H. Ha and Y. Hasegawa and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and Hsiung, {Y. B.} and Hyun, {H. J.} and K. Inami and M. Iwabuchi and Y. Iwasaki and T. Julius and Kang, {J. H.} and H. Kawai and T. Kawasaki and H. Kichimi and C. Kiesling and Kim, {H. J.} and Kim, {H. O.} and Kim, {J. H.} and Kim, {M. J.} and Kim, {Y. J.} and K. Kinoshita and Ko, {B. R.} and P. Kody{\v z} and S. Korpar and M. Kreps and P. Kri{\v z}an and P. Krokovny and T. Kuhr and T. Kumita and A. Kuzmin and Kwon, {Y. J.} and Kyeong, {S. H.} and Lee, {M. J.} and Lee, {S. H.} and J. Li and A. Limosani and Y. Liu and D. Liventsev and R. Louvot and A. Matyja and S. McOnie and K. Miyabayashi and H. Miyata and Y. Miyazaki and Mohanty, {G. B.} and T. Mori and E. Nakano and M. Nakao and H. Nakazawa and S. Neubauer and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and H. Ozaki and G. Pakhlova and Park, {C. W.} and Park, {H. K.} and R. Pestotnik and M. Petri{\v c} and Piilonen, {L. E.} and M. Prim and M. Rozanska and S. Ryu and H. Sahoo and Y. Sakai and O. Schneider and J. Sch{\"u}mann and C. Schwanda and Schwartz, {A. J.} and K. Senyo and Sevior, {M. E.} and M. Shapkin and H. Shibuya and Shiu, {J. G.} and B. Shwartz and Singh, {J. B.} and P. Smerkol and E. Solovieva and S. Stani{\v c} and M. Stari{\v c} and K. Sumisawa and T. Sumiyoshi and Y. Teramoto and I. Tikhomirov and K. Trabelsi and S. Uehara and T. Uglov and Y. Unno and S. Uno and Y. Ushiroda and G. Varner and Varvell, {K. E.} and K. Vervink and Wang, {C. H.} and Wang, {M. Z.} and P. Wang and Y. Watanabe and R. Wedd and E. Won and Yabsley, {B. D.} and Y. Yamashita and M. Yamauchi and Yuan, {C. Z.} and Zhang, {C. C.} and V. Zhilich and T. Zivko and A. Zupanc and O. Zyukova",

year = "2010",

month = oct,

day = "22",

doi = "10.1103/PhysRevD.82.071101",

language = "English",

volume = "82",

journal = "Physical review D: Particles and fields",

issn = "0556-2821",

publisher = "American Institute of Physics Publising LLC",

number = "7",

}

TY - JOUR

T1 - Evidence for B-→τ-ν̄τ with a semileptonic tagging method

AU - Hara, K.

AU - Iijima, T.

AU - Aihara, H.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Aziz, T.

AU - Bakich, A. M.

AU - Barberio, E.

AU - Belous, K.

AU - Bischofberger, M.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, P.

AU - Chao, Y.

AU - Chen, A.

AU - Cheon, B. G.

AU - Chiang, C. C.

AU - Cho, I. S.

AU - Choi, Y.

AU - Dalseno, J.

AU - Danilov, M.

AU - Doležal, Z.

AU - Dungel, W.

AU - Eidelman, S.

AU - Gabyshev, N.

AU - Goldenzweig, P.

AU - Golob, B.

AU - Ha, H.

AU - Hasegawa, Y.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Inami, K.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Julius, T.

AU - Kang, J. H.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kiesling, C.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kim, J. H.

AU - Kim, M. J.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Kodyž, P.

AU - Korpar, S.

AU - Kreps, M.

AU - Križan, P.

AU - Krokovny, P.

AU - Kuhr, T.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Kyeong, S. H.

AU - Lee, M. J.

AU - Lee, S. H.

AU - Li, J.

AU - Limosani, A.

AU - Liu, Y.

AU - Liventsev, D.

AU - Louvot, R.

AU - Matyja, A.

AU - McOnie, S.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mohanty, G. B.

AU - Mori, T.

AU - Nakano, E.

AU - Nakao, M.

AU - Nakazawa, H.

AU - Neubauer, S.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Ozaki, H.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Prim, M.

AU - Rozanska, M.

AU - Ryu, S.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Schneider, O.

AU - Schümann, J.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shibuya, H.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Singh, J. B.

AU - Smerkol, P.

AU - Solovieva, E.

AU - Stanič, S.

AU - Starič, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Teramoto, Y.

AU - Tikhomirov, I.

AU - Trabelsi, K.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Ushiroda, Y.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vervink, K.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Wang, P.

AU - Watanabe, Y.

AU - Wedd, R.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Yuan, C. Z.

AU - Zhang, C. C.

AU - Zhilich, V.

AU - Zivko, T.

AU - Zupanc, A.

AU - Zyukova, O.

PY - 2010/10/22

Y1 - 2010/10/22

N2 - We present a measurement of the decay B-→τ -ν̄τ using a data sample containing 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of B+B- pairs are tagged by reconstructing one B+ meson decaying semileptonically. We detect the B-→τ -ν̄τ 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 B(B-→τ -ν̄τ)=[1.54-0.37+0.38(stat)-0.31+0.29(syst)] ×10-4. This result confirms the evidence for B -→τ-ν̄τ obtained in a previous Belle measurement that used a hadronic B tagging method.

AB - We present a measurement of the decay B-→τ -ν̄τ using a data sample containing 657×106 BB̄ pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. A sample of B+B- pairs are tagged by reconstructing one B+ meson decaying semileptonically. We detect the B-→τ -ν̄τ 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 B(B-→τ -ν̄τ)=[1.54-0.37+0.38(stat)-0.31+0.29(syst)] ×10-4. This result confirms the evidence for B -→τ-ν̄τ obtained in a previous Belle measurement that used a hadronic B tagging method.

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U2 - 10.1103/PhysRevD.82.071101

DO - 10.1103/PhysRevD.82.071101

M3 - Article

AN - SCOPUS:78650973111

VL - 82

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 0556-2821

IS - 7

M1 - 071101

ER -