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54 results on '"K. Gotow"'

1. Measurement of the branching fraction for B→η′K and search for B→η′π+

Author: K Abe, R Abe, I Adachi, B.S Ahn, H Aihara, M Akatsu, Y Asano, T Aso, V Aulchenko, A.M Bakich, E Banas, S Behari, P.K Behera, D Beiline, A Bondar, A Bozek, T.E Browder, B.C.K Casey, P Chang, Y Chao, B.G Cheon, R Chistov, S.-K Choi, Y Choi, L.Y Dong, J Dragic, S Eidelman, Y Enari, F Fang, H Fujii, C Fukunaga, M Fukushima, N Gabyshev, A Garmash, T Gershon, A Gordon, K Gotow, R Guo, J Haba, H Hamasaki, K Hara, T Hara, N.C Hastings, H Hayashii, M Hazumi, E.M Heenan, I Higuchi, T Higuchi, H Hirano, T Hojo, Y Hoshi, K Hoshina, S.R Hou, W.-S Hou, S.-C Hsu, H.-C Huang, Y Igarashi, T Iijima, H Ikeda, K Inami, A Ishikawa, H Ishino, R Itoh, G Iwai, H Iwasaki, Y Iwasaki, D.J Jackson, P Jalocha, H.K Jang, J Kaneko, J.H Kang, J.S Kang, N Katayama, H Kawai, N Kawamura, T Kawasaki, H Kichimi, D.W Kim, Heejong Kim, H.J Kim, Hyunwoo Kim, S.K Kim, T.H Kim, K Kinoshita, S Kobayashi, H Konishi, P Krokovny, R Kulasiri, S Kumar, A Kuzmin, Y.-J Kwon, J.S Lange, G Leder, S.H Lee, D Liventsev, R.-S Lu, T Matsubara, S Matsumoto, T Matsumoto, J MacNaughton, Y Mikami, K Miyabayashi, H Miyake, H Miyata, G.R Moloney, S Mori, T Mori, A Murakami, T Nagamine, Y Nagasaka, Y Nagashima, T Nakadaira, E Nakano, M Nakao, J.W Nam, S Narita, Z Natkaniec, K Neichi, S Nishida, O Nitoh, S Noguchi, T Nozaki, S Ogawa, T Ohshima, T Okabe, S Okuno, H Ozaki, P Pakhlov, H Palka, C.S Park, C.W Park, H Park, L.S Peak, M Peters, L.E Piilonen, E Prebys, J.L Rodriguez, N Root, M Rozanska, K Rybicki, H Sagawa, Y Sakai, H Sakamoto, M Satapathy, A Satpathy, S Semenov, K Senyo, M.E Sevior, H Shibuya, B Shwartz, S Stanič, A Sugi, A Sugiyama, K Sumisawa, T Sumiyoshi, K Suzuki, S Suzuki, S.Y Suzuki, S.K Swain, T Takahashi, M Takita, K Tamai, N Tamura, J Tanaka, M Tanaka, Y Tanaka, Y Teramoto, M Tomoto, T Tomura, S.N Tovey, K Trabelsi, T Tsuboyama, T Tsukamoto, S Uehara, K Ueno, Y Unno, S Uno, Y Ushiroda, K.E Varvell, C.C Wang, C.H Wang, J.G Wang, M.-Z Wang, Y Watanabe, E Won, B.D Yabsley, Y Yamada, M Yamaga, A Yamaguchi, Y Yamashita, M Yamauchi, S Yanaka, J Yashima, K Yoshida, Y Yusa, H Yuta, C.C Zhang, J Zhang, H.W Zhao, Y Zheng, V Zhilich, and D Žontar
Subjects: Physics, Particle physics, Nuclear and High Energy Physics, Meson, Branching fraction, Pi, High Energy Physics::Experiment, Nuclear Experiment, Confidence interval
Abstract: We report measurements for two-body charmless B decays with an eta' meson in the final state. Using 11.1X10^6 BBbar pairs collected with the Belle detector, we find BF(B^+ ->eta'K^+)=(79^+12_-11 +-9)x10^-6 and BF(B^0 -> eta'K^0)=(55^+19_-16 +-8)x10^-6, where the first and second errors are statistical and systematic, respectively. No signal is observed in the mode B^+ -> eta' pi^+, and we set a 90% confidence level upper limit of BF(B^+-> eta'pi^+) eta'K^+- decays is investigated and a limit at 90% confidence level of -0.20
Published: 2001
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2. A measurement of the branching fraction for the inclusive B→Xγ decays with the Belle detector

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, E. Banas, W. Bartel, S. Behari, P.K. Behera, D. Beiline, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, T. Haruyama, N.C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E.M. Heenan, Y. Higasino, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D.J. Jackson, P. Jalocha, H.K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J.H. Kang, J.S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, Hyunwoo Kim, S.K. Kim, K. Kinoshita, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J.S. Lange, M.H. Lee, S.H. Lee, H.B. Li, D. Liventsev, R.-S. Lu, A. Manabe, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L.C. Moffitt, G.R. Moloney, G.F. Moorhead, S. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C.S. Park, C.W. Park, H. Park, L.S. Peak, M. Peters, L.E. Piilonen, E. Prebys, J.L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, S.K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G.N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S.E. Vahsen, G. Varner, K.E. Varvell, C.C. Wang, C.H. Wang, M.-Z. Wang, T.J. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C.C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, KEKB, Branching fraction, Detector, Radiative transfer, Resonance, B meson, Storage ring, High Energy Physics - Experiment
Abstract: We have measured the branching fraction of the inclusive radiative B meson decay B --> X(s) gamma to be Br(B->X(s)gamma)=(3.36 +/- 0.53(stat) +/- 0.42(sys) +0.50-0.54(th)) x 10^{-4}. The result is based on a sample of 6.07 x 10^6 BBbar events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e^+e^- storage ring., Comment: 14 pages, 6 Postsript figures, uses elsart.cls
Published: 2001

3. Measurement ofBd0−B¯d0Mixing Rate from the Time Evolution of Dilepton Events at theϒ(4S)

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, S. Eidelman, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, Y. Fujita, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, T. Haji, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, Y. Inoue, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, K. Kasami, N. Katayama, H. Kawai, M. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Koike, S. Koishi, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, M. H. Lee, S. H. Lee, C. Leonidopoulos, H.-B. Li, R.-S. Lu, Y. Makida, A. Manabe, D. Marlow, T. Matsubara, T. Matsuda, S. Matsui, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, A. Mohapatra, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. Raaf, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, H. Sakaue, M. Satapathy, N. Sato, A. Satpathy, S. Schrenk, S. Semenov, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, V. Sidorov, S. Stanic̆, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, M.-Z. Wang, T. J. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamaguchi, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Z̆ontar
Subjects: Physics, Nuclear physics, Particle physics, KEKB, Muon, Mixing (mathematics), Time evolution, General Physics and Astronomy
Abstract: We report a determination of the ${B}_{d}^{0}\ensuremath{-}{\overline{B}}_{d}^{0}$ mixing parameter $\ensuremath{\Delta}{m}_{d}$ based on the time evolution of dilepton yields in $\ensuremath{\Upsilon}(4S)$ decays. The measurement is based on a $5.9{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing $\ensuremath{\Delta}{m}_{d}$ as a free parameter. Using both muons and electrons, we obtain $\ensuremath{\Delta}{m}_{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.463\ifmmode\pm\else\textpm\fi{}0.008(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.016(\mathrm{syst}){\mathrm{ps}}^{\ensuremath{-}1}$. This is the first determination of $\ensuremath{\Delta}{m}_{d}$ from time evolution measurements at the $\ensuremath{\Upsilon}(4S)$. We also place limits on possible $\mathrm{CPT}$ violations.
Published: 2001

4. Measurement of theCPViolation Parametersin2φ1inBd0Meson Decays

Author: A. Abashian, K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, K. Fujimoto, Y. Fujita, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, T. Haji, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, T. Haruyama, N. C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E. M. Heenan, Y. Higashi, Y. Higashino, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, M. Hirose, T. Hojo, Y. Hoshi, K. Hoshina, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, Y. Inoue, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, M. Iwai, M. Iwamoto, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, K. Kasami, N. Katayama, H. Kawai, M. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Koike, S. Koishi, Y. Kondo, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, M. H. Lee, S. H. Lee, C. Leonidopoulos, H.-B. Li, R.-S. Lu, Y. Makida, A. Manabe, D. Marlow, T. Matsubara, T. Matsuda, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, A. Mohapatra, G. R. Moloney, G. F. Moorhead, N. Morgan, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, H. Sakaue, M. Satapathy, N. Sato, A. Satpathy, S. Schrenk, S. Semenov, Y. Settai, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J. Suzuki, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, M.-Z. Wang, T. J. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamaguchi, H. Yamamoto, T. Yamanaka, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, H. W. Zhao, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, Resonance, CP violation, High Energy Physics::Experiment, Standard Model
Abstract: We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ (also known as $\mathrm{sin}2\ensuremath{\beta}$) based on a $10.5{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is reconstructed in the $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$, $J/\ensuremath{\psi}{K}_{L}$, or $J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ $\mathrm{CP}$-eigenstate decay channel and the flavor of the accompanying $B$ meson is identified from its charged particle decay products. From the asymmetry in the distribution of the time interval between the two $B$-meson decay points, we determine $\mathrm{sin}2{\ensuremath{\varphi}}_{1}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.58}_{\ensuremath{-}0.34}^{+0.32}(\mathrm{stat}{)}_{\ensuremath{-}0.10}^{+0.09}(\mathrm{syst})$.
Published: 2001

5. An experimental study of the process e+e−→e+e−μ+μ−

Author: R. L. Lander, N. Nakajima, S. K. Choi, C. Rosenfeld, K. Gotow, Takashi Sasaki, H. S. Ahn, P. N. Kirk, Saroj Kumar Sahu, H. Miyata, Y. Yamashita, Y. Sakai, Yuki Fujii, Winston Ko, K. Ueno, S. Behari, A. Murakami, Tsunehiko Omori, L. E. Piilonen, Moo Hyun Lee, A. M. Bacala, Koji Abe, S. Igarashi, T. Aso, Richard Breedon, D. Y. Kim, J. Rowe, M. Sato, Yasuhiro Sugimoto, S. S. Myung, A. Abashian, Hiroyuki Sagawa, A. Kimura, T. Nozaki, J. S. Kang, S. K. Kim, Y. Takaiwa, Hyunyong Kim, S. Kobayashi, Kazumasa Miyano, Naomi Takashimizu, Susumu Terada, Stephen L. Olsen, Yoshimasa Kurihara, M. Shirai, T. J. Wang, Steve Schnetzer, A. Maki, L. Y. Zheng, and S. Matsumoto
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Analytical chemistry, High Energy Physics::Experiment, Luminosity
Abstract: We present the results of a study of e + e − μ + μ − final states produced in e + e − collisions at a center-of-mass energy of 58 GeV using the AMY detector at TRISTAN. The data correspond to a total integrated luminosity of 292.8 pb −1 . The results show good agreement with order α 4 QED predictions.
Published: 1998

6. Observation of exclusive η production in two photon interactions at TRISTAN

Author: N. Nakajima, Takashi Sasaki, S. S. Myung, Hyunyong Kim, H. Miyata, Y. Yamashita, Y. Sakai, D. Y. Kim, Kazuo Abe, K. Gotow, H. S. Ahn, C. Rosenfeld, A. M. Bacala, M. Shirai, T. J. Wang, J. S. Kang, A. Abashian, Yuki Fujii, R. L. Lander, S. Kobayashi, A. Kimura, Tsunehiko Omori, T. Nozaki, Moo Hyun Lee, K. Ueno, Saroj Kumar Sahu, Richard Breedon, S. K. Choi, Hiroyuki Sagawa, M. Sato, N. Takashimizu, A. Maki, L. Y. Zheng, Winston Ko, S.L. Olsen, P. N. Kirk, T. Aso, L. E. Piilonen, J. Rowe, Yasuhiro Sugimoto, A. Murakami, S. K. Kim, Kazumasa Miyano, Susumu Terada, S. Behari, Yoshimasa Kurihara, Steve Schnetzer, Y. Takaiwa, and S. Matsumoto
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Two-photon excitation microscopy, Astrophysics::High Energy Astrophysical Phenomena, Radiative decay, High Energy Physics::Experiment, Nuclear Experiment, Energy (signal processing)
Abstract: We observe ηc production in the two photon process e+e−→e+e−ηc at an e+e− center-of-mass energy of 58 GeV. We determine the radiative decay width Γγγ(ηc) to be 27±16(sta)±10(sys) keV.
Published: 1998

7. Measurement of α using NLLA+O(α2) in e+e− annihilation at =58.0 GeV

Author: Koji Abe, S. S. Myung, S. Behari, H. S. Ahn, Yasuhiro Sugimoto, K. Gotow, Y. Sakai, P. N. Kirk, H. Miyata, Y. Yamashita, Winston Ko, Y. Takaiwa, D. Y. Kim, L. E. Piilonen, A. Abashian, K. Ueno, S. Choi, Hiroyuki Sagawa, N. Takashimizu, Saroj Kumar Sahu, R. L. Lander, J. Rowe, Yoshimasa Kurihara, M. Satou, Tsunehiko Omori, T. Kojima, Steve Schnetzer, C. Rosenfeld, S. K. Choi, N. Nakajima, Takashi Sasaki, Hyunyong Kim, S. Kanda, S. Matsumoto, T. Nozaki, Yuki Fujii, A. Maki, L. Y. Zheng, Richard Breedon, M. Shirai, T. J. Wang, J. S. Kang, S. Kobayashi, Moo Hyun Lee, T. Aso, S. L. Olsen, S. K. Kim, Kazumasa Miyano, Susumu Terada, and A. Murakami
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Strong coupling, High Energy Physics::Experiment, Jet (particle physics)
Abstract: A measurement of the strong coupling constant αS is presented using hadronic events produced in e+e− annihilations at s =58.0 GeV from the AMY detector at TRISTAN. The measurement is based on comparisons of the distributions of thrust, heavy jet mass, total jet broadening, wide jet broadening, and energy-energy correlations with QCD calculations resummed up to next-to-leading-logarithms matched with the O(αS2) perturbative calculation. Combining the results of the individual evaluations, we find α S (58 GeV )=0.132±0.006 .
Published: 1998

8. A measurement of the photon structure function F2 at Q2 = 6.8 GeV2

Author: Moo Hyun Lee, N. Takashimizu, Kazuo Abe, D. Y. Kim, Winston Ko, K. Gotow, Y. Fujii, Tadao Nozaki, H. S. Ahn, Hiroyuki Sagawa, T. Aso, A. Murakami, Richard Breedon, A. Abashian, S. Matsumoto, Saroj Kumar Sahu, M. Shirai, T. J. Wang, M. Sato, Yasuhiro Sugimoto, A. Maki, L. Y. Zheng, Kazumasa Miyano, S. Behari, Steve Schnetzer, Suyong Choi, Y. Takaiwa, Susumu Terada, K. Ueno, N. Nakajima, Takashi Sasaki, S. S. Myung, R. L. Lander, Stephen L. Olsen, Seong Keun Kim, Yoshimasa Kurihara, J. S. Kang, L. E. Piilonen, J. Rowe, C. Rosenfeld, S. Kobayashi, T. Kojima, H. Miyata, Y. Yamashita, Y. Sakai, Tsunehiko Omori, and P. N. Kirk
Subjects: Nuclear physics, Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, law, Detector, Parton, Collider, Value (mathematics), Photon structure function, law.invention
Abstract: The photon structure function F-2(gamma) has been measured at an average Q(2) value of 6.8 GeV2 using data collected by the AMY detector at the TRISTAN e(+)e(-) collider. The measured F-2(gamma) is compared with several QCD-based parton density models. (C) 1997 Published by Elsevier Science B.V.
Published: 1997

9. Measurement of D∗± production in two-photon processes at TRISTAN

Author: N. Takashimizu, T. Sasaki, H. Miyata, T. Aso, K. Miyano, N. Nakajima, K. Ohkubo, M. Satou, M. Shirai, Y. Yamashita, K. Abe, Y. Fujii, S. Igarashi, Y. Kurihara, M.H. Lee, F. Liu, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, P. Kirk, T.J. Wang, A. Abashian, K. Gotow, L. Piilonen, S.K. Choi, C. Rosenfeld, L.Y. Zheng, R.E. Breedon, Winston Ko, R.L. Lander, J. Rowe, S. Kanda, S.L. Olsen, K. Ueno, F. Kajino, S. Schnetzer, S. Behari, S. Kobayashi, A. Murakami, S.K. Sahu, J.S. Kang, D.Y. Kim, S.S. Myung, H.S. Ahn, S.K. Kim, and S. Matsumoto
Subjects: Nuclear and High Energy Physics
Published: 1996

10. Measurement of the forward-backward asymmetry in ee → b and the b-quark branching ratio to muons at TRISTAN using neural networks

Author: Takashi Sasaki, P. N. Kirk, Hiroyuki Sagawa, Suyong Choi, K. Gotow, Y. Fujii, S. S. Myung, C. Rosenfeld, A. Murakami, M. H. Lee, M. Shirai, Y. Yamashita, S. Igarashi, F. Liu, A. Maki, T. Aso, L. Y. Zheng, K. Ohkubo, S. Kobayashi, D. Y. Kim, S. Behari, Yasuhiro Sugimoto, S. Matsumoto, T. Nozaki, Stephen L. Olsen, H. S. Ahn, N. Takashimizu, Yoshimasa Kurihara, Kazuo Abe, N. Nakajima, S. Kanda, M. Yang, R. L. Lander, S. K. Sahu, Kazumasa Miyano, T. J. Wang, Y. Takaiwa, Steve Schnetzer, H. Fujimoto, Susumu Terada, Winston Ko, Richard Breedon, K. Ueno, M. Sato, Seong Keun Kim, A. Abashian, J. S. Kang, F. Kajino, J. Rowe, Tsunehiko Omori, H. Miyata, Y. Sakai, and L. E. Piilonen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Artificial neural network, Branching fraction, media_common.quotation_subject, High Energy Physics::Phenomenology, Forward backward, Asymmetry, Bottom quark, Standard Model, Nuclear physics, High Energy Physics::Experiment, media_common, Bar (unit)
Abstract: The forward-backward asymmetry in e(+)e(-) --> b (b) over bar at root s = 57.9 GeV and the b-quark branching ratio to muons have been measured using neural networks. Unlike previous methods for measuring the b (b) over bar forward-backward asymmetry where the estimated background from c-quark decays and other sources are subtracted, here events are categorized as either b (b) over bar or non-b (b) over bar events by neural networks based on event-by-event characteristics. The determined asymmetry is -0.429 +/- 0.044(stat) +/- 0.047(sys) and is consistent with the prediction of the standard model. The measured B (B) over bar mixing parameter is 0.136 +/- 0.037(stat) +/- 0.040(sys) +/- 0.002(model) and the measured b-quark branching ratio to muons is 0.122 +/- 0.006(stat) +/- 0.007(sys).
Published: 1996

11. Measurement of D∗± production in two-photon processes at TRISTAN

Author: Richard Breedon, K. Ueno, Steve Schnetzer, M. Sato, P. N. Kirk, M. H. Lee, S. Matsumoto, K. Gotow, Y. Fujii, L. E. Piilonen, Seong Keun Kim, J. S. Kang, Y. Yamashita, T. Aso, N. Takashimizu, S. S. Myung, H. S. Ahn, Yasuhiro Sugimoto, A. Maki, Takashi Sasaki, C. Rosenfeld, S. Kanda, F. Kajino, A. Murakami, L. Y. Zheng, T. J. Wang, H. Miyata, Kazuo Abe, Y. Sakai, D. Y. Kim, Suyong Choi, Hiroyuki Sagawa, J. Rowe, Winston Ko, Tsunehiko Omori, S. Behari, A. Abashian, Stephen L. Olsen, M. Shirai, Yoshimasa Kurihara, Y. Takaiwa, T. Nozaki, R. L. Lander, K. Ohkubo, F. Liu, N. Nakajima, S. Kobayashi, S. K. Sahu, S. Igarashi, Kazumasa Miyano, and Susumu Terada
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Meson, High Energy Physics::Phenomenology, Sigma, Vector meson dominance, Jet (particle physics), law.invention, Nuclear physics, law, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Collider
Abstract: The inclusive cross section for the production of charmed D*(+/-) mesons in two-photon processes is measured with the AMY detector at the TRISTAN e(+)e(-) collider. D*(+/-) mesons ate identified from the distribution of charged-particle transverse momenta relative to the jet axis. A data sample corresponding to an integrated luminosity of 176 pb(-1) at a center-of-mass energy of 58 GeV is used to determine a cross section sigma(e(+)e(-) --> e(+)e(-)D*(+/-)X) = 270 +/- 49(stat) +/- 38(syst) pb. The results are compared with theoretical expectations based on the Vector Meson Dominance, direct quark-parton model, and resolved photon processes.
Published: 1996

12. Observation of the color coherence effect in sub-jet multiplicity of three-jet and four-jet events in e+e− annihilations

Author: L. E. Piilonen, K. Ueno, S. Kanda, M. Yang, J. S. Kang, F. Liu, S. S. Myung, Yasuhiro Sugimoto, N. Takashimizu, S. Behari, S. Kobayashi, Moo Hyun Lee, K. Gotow, Y. Fujii, H. S. Ahn, A. Murakami, Yoshimasa Kurihara, Steve Schnetzer, T. Aso, Hiroyuki Sagawa, H. Miyata, T. Nozaki, Y. Sakai, S.L. Olsen, Y. Takaiwa, D. Y. Kim, A. Abashian, P. N. Kirk, J. Rowe, S. Matsumoto, Tsunehiko Omori, S. K. Sahu, Kazumasa Miyano, Kazuo Abe, Winston Ko, Y. Yamashita, H. Fujimoto, Susumu Terada, Richard Breedon, T. J. Wang, M. Sato, A. Maki, L. Y. Zheng, C. Rosenfeld, S. K. Kim, N. Nakajima, R. L. Lander, Takashi Sasaki, S. K. Choi, K. Ohkubo, and M. Shirai
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Coherence effect, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Monte Carlo method, High Energy Physics::Experiment, Multiplicity (chemistry), Gluon
Abstract: We have measured the ratio of the average sub-jet multiplicity in 3-jet to 2-jet events, R(23), and 4-jet to 2-jet events, R(24), using the e(+)e(-) annihilation data at root s = 58 GeV obtained from the AMY detector. We compare the measured values of R(23) and R(24) With the predictions of coherent and incoherent Monte Carlo models. R(23) is also compared with the NLLA calculations to all-orders. The color coherence effect has been observed to contribute to the suppression of R(23) and R(24) Also, the difference of the behavior between gluon jets in 3-jet and 4-jet events has been studied.
Published: 1996

13. New limits on the masses of the selectron and photino

Author: Richard Breedon, R. L. Lander, C. Rosenfeld, M. Sato, T. J. Wang, S. K. Sahu, Kazumasa Miyano, L. E. Piilonen, Hiroyuki Sagawa, Y. Fujii, Y. Takaiwa, Tsunehiko Omori, H. Fujimoto, T. Nozaki, S. Behari, Stephen L. Olsen, Susumu Terada, A. Abashian, S. Igarashi, S. S. Myung, J. S. Kang, N. Takashimizu, S. Kobayashi, F. Liu, F. Kajino, Yoshimasa Kurihara, H. Miyata, D. Y. Kim, Y. Sakai, K. Ohkubo, A. Maki, Moo Hyun Lee, M. Shirai, A. Murakami, J. Rowe, L. Y. Zheng, Kazuo Abe, Seong Keun Kim, N. Nakajima, H. S. Ahn, P. N. Kirk, Winston Ko, Y. Yamashita, Takashi Sasaki, Suyong Choi, M. Yang, S. Matsumoto, Steve Schnetzer, S. Kanda, K. Gotow, T. Aso, K. Ueno, and Y. Sugimoto
Subjects: Massless particle, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Selectron tube, Electron–positron annihilation, Scalar (mathematics), Supersymmetry, Center of mass, Photino, Standard Model
Abstract: A study of e + e − annihilations into final states containing a single energetic photon with no accompanying particles is made at a center of mass energy of 57.8 GeV. The measured cross section is consistent with expectations from standard model processes and is used to set limits on the masses of the scalar electron and photino particles predicted by supersymmetry theories. If the photino is assumed to be massless, the 90% confidence level lower limit on the mass of the degenerate scalar electron is 65.5 GeV. If the results of all the single photon experiments are combined, this lower limit increases to 79.3 GeV.
Published: 1996

14. Measurement of charm production in two-photon processes using inclusive lepton events at TRISTAN

Author: L. E. Piilonen, Bj Kim, S. K. Sahu, Kazumasa Miyano, K. Ohkubo, Seong Keun Kim, M. H. Lee, Susumu Terada, K. Gotow, Y. Fujii, M. Oyoshi, N. Nakajima, A. Murakami, P. N. Kirk, T. Aso, S. Behari, H. S. Ahn, Suyong Choi, Takashi Sasaki, R. L. Lander, Y. Yamashita, S. Matsumoto, S. Kobayashi, Kisoo Lee, Kazuo Abe, K. Ueno, Y. Sugimoto, A. Abashian, H. Fujimoto, J. R. Smith, S. Kanda, M. Yang, Winston Ko, Hiroyuki Sagawa, J. Rowe, J. S. Kang, F. Kajino, Tsunehiko Omori, Dong-Chul Son, T. J. Wang, A. Bodek, Ryuki Tanaka, Steve Schnetzer, M. Shirai, Y. Takaiwa, N. Takashimizu, C. Rosenfeld, H. Miyata, Y. Sakai, Stephen L. Olsen, S. S. Myung, A. Maki, L. Y. Zheng, Yoshimasa Kurihara, T. Nozaki, F. Liu, D. Y. Kim, Richard Breedon, and M. Sato
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Muon, High Energy Physics::Phenomenology, Hadron, Electron, Charm quark, Nuclear physics, High Energy Physics::Experiment, Center of mass, Charm (quantum number), Nuclear Experiment, Lepton
Abstract: Measurements of open charm production in photon-photon collisions made with the AMY detector at TRISTAN are reported. Charmed hadrons were identified by detecting the high momentum muons or electrons from their semileptonic decays. The data sample corresponds to an integrated luminosity of 275 pb −1 at an average center of mass energy of 58 GeV. Results are presented in the form of cross sections of inclusive leptons from charm for both muons and electrons. The measured cross section is 1.8 standard deviations higher than theoretical predictions based on the direct and photon-gluon fusion process, where the mass of charm quark is assumed to be 1.6 GeV.
Published: 1995

15. A measurement of Bose-Einstein correlations in e+e− annihilation at TRISTAN

Author: M. E. Mattson, H. Miyata, A. Murakami, Kazuo Abe, Hiroyuki Sagawa, K. Ueno, Y. Sugimoto, J. Rowe, A. Bodek, P. N. Kirk, Y. Yamashita, Tsunehiko Omori, Ryuki Tanaka, Y. Takaiwa, T. Nozaki, Bj Kim, S. Matsumoto, C. Rosenfeld, C. A. Fry, J. S. Kang, Stephen L. Olsen, F. Kajino, Yoshimasa Kurihara, F. Liu, M. Oyoshi, K. Gotow, N. Takashimizu, M. Shirai, R. C. Walker, S. S. Myung, T. Aso, Steve Schnetzer, S. Kanda, Richard Breedon, Seong Keun Kim, Saroj Kumar Sahu, Takashi Sasaki, S. Ebara, K. L. Sterner, M. Sato, J. Vinson, Suyong Choi, S. Behari, A. Maki, L. Y. Zheng, R. L. Lander, D. Y. Kim, Moo Hyun Lee, K. Ohkubo, L. E. Piilonen, Winston Ko, C. Velissaris, Kazumasa Miyano, Susumu Terada, N. Nakajima, S. Kobayashi, A. Abashian, Y. Fujii, and Y. Sakai
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, law, Track (disk drive), Detector, High Energy Physics::Experiment, Bose–Einstein correlations, Collider, law.invention
Abstract: Using e+e− annihilation events accumulated with the AMY detector at the TRISTAN collider, we have studied the Bose-Einstein correlations in the distributions of like-sign charged tracks. As reference samples we used the opposite-sign charged track pairs and mixed pairs, which are like-sign pairs synthesized from tracks belonging to different events. The results of the different reference samples give approximately 0.45 for the correlation strength and approximately 0.65 fm for the source size. Previous measurements of these parameters in e+e− annihilation at energies from CESR to LEP show remarkably flat dependence on s . Our results conform well with this picture.
Published: 1995

16. A determination of α in e+e− annihilation at GeV

Author: J. S. Kang, R. C. Walker, Steve Schnetzer, S. Ebara, N. Takashimizu, K. Gotow, Moo Hyun Lee, P. N. Kirk, Y. Fujii, M. H. Ye, F. Liu, Kazuo Abe, Y. Yamashita, T. Ishizuka, T. Aso, Tsunehiko Omori, David Stuart, Richard Breedon, Y. K. Li, C. A. Fry, S. Lusin, Dong-Chul Son, Ryuki Tanaka, Bj Kim, Takashi Sasaki, K. Ueno, J. Rowe, H. Miyata, Y. Takaiwa, J. Vinson, Y. Sakai, A. Bodek, M. E. Mattson, Robert Stone, A. Murakami, Seong Keun Kim, J. R. Smith, F. Kajino, W. G. Yan, W. X. Gao, D. Y. Kim, T. Thomas, S. S. Myung, C. Velisarris, Hiroyuki Sagawa, S. Matsumoto, T. Nozaki, C. Rosenfeld, A. Maki, L. Y. Zheng, K. L. Sterner, Stephen L. Olsen, M. Oyoshi, A. Abashian, Yoshimasa Kurihara, S. Kobayashi, S. Kanda, R. L. Lander, C. P. Cheng, S. Wilson, Suyong Choi, Kisoo Lee, Saroj Kumar Sahu, Kazumasa Miyano, Yasuhiro Sugimoto, Y. S. Chung, Susumu Terada, R. Poling, S. Behari, T. Kumita, K. W. Park, L. E. Piilonen, L. M. Chinitz, and Winston Ko
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Logarithm, Electron–positron annihilation, High Energy Physics::Phenomenology, Monte Carlo method, Jet (particle physics), Nuclear physics, Strong coupling, High Energy Physics::Experiment, Matrix element
Abstract: We present a study of differential two jet ratios in multi-hadronic final states produced by e(+)e(-) annihilation in the AMY detector at TRISTAN. The data are compared to the predictions of the next-to-leading logarithm parton-shower (NLL PS) Monte Carlo and the O(alpha(s)(2)) matrix element QCD models. We determine the strong coupling strength alpha(s)(57.3 GeV) = 0.130 +/- 0.006.
Published: 1995

17. A high-Q2 measurement of the photon structure function F2

Author: N. Takashimizu, T. Nozaki, Bj Kim, N. Nakajima, Dong-Chul Son, K. Gotow, David Stuart, Winston Ko, T. Aso, Saroj Kumar Sahu, S. Behari, Takashi Sasaki, Kazuo Abe, F. Kajino, J. S. Kang, F. Liu, S. Kobayashi, C. Rosenfeld, M. E. Mattson, S. Ebara, Moo Hyun Lee, Richard Breedon, K. Ueno, Y. Sugimoto, K. Ohkubo, S. S. Myung, L. E. Piilonen, P. N. Kirk, Suyong Choi, H. Fujimoto, J. R. Smith, Y. Yamashita, K. L. Sterner, A. Abashian, Y. Sakai, Kisoo Lee, S. Kanda, D. Y. Kim, T. J. Wang, H. Miyata, Y. Fujii, Ryuki Tanaka, Y. Takaiwa, C. Velissaris, M. Oyoshi, R. L. Lander, M. Yang, M. Shirai, Stephen L. Olsen, Yoshimasa Kurihara, A. Maki, A. Murakami, Seong Keun Kim, Tsunehiko Omori, J. Rowe, L. Y. Zheng, S. Matsumoto, A. Bodek, Steve Schnetzer, Kazumasa Miyano, Susumu Terada, Hiroyuki Sagawa, M. Sato, and J. Vinson
Subjects: Momentum, Physics, Nuclear physics, Nuclear and High Energy Physics, Photon, law, Detector, Parton, Atomic physics, Collider, Photon structure function, law.invention
Abstract: The photon structure function F 2 γ has been measured at average Q 2 values of 73 and 390 GeV 2 using data collected by the AMY detector at the TRISTAN e + e − collider. F 2 γ is observed to be increasing as ln Q 2 . The x -dependence of F 2 γ , where x is the momentum fraction carried by the parton inside the photon, is also measured. The measurements are compared with several parton density models.
Published: 1995

18. Measurements of cross section and charge asymmetry for e+e− → μ+μ− and e+e− → τ+τ− at = 57.8

Author: David Stuart, D. Haim, B. J. Kim, C. Rosenfeld, K. Ueno, Y. Sugimoto, J. R. Smith, Kazuo Abe, T. Thomas, Sun Kee Kim, Kisoo Lee, H. Miyata, J. Rowe, M. H. Ye, M. Shirai, A. Bodek, Robert Stone, S. Matsumoto, Yoshimasa Kurihara, Moo Hyun Lee, T. Nozaki, L. M. Chinitz, S. Kobayashi, S. Kanda, F. Kajino, C. A. Fry, Y. Sakai, A. Abashian, C. P. Cheng, Y. K. Li, S. S. Myung, R. C. Walker, Steve Schnetzer, C. Velissaris, Winston Ko, N. Takashimizu, A. Maki, L. Y. Zheng, Dong-Chul Son, K. L. Sterner, Y. Fujii, K. Gotow, S. Wilson, S. L. Olsen, T. Aso, Richard Breedon, T. Kumita, Ryuki Tanaka, Takashi Sasaki, Y. Takaiwa, J. Vinson, M. E. Mattson, T. Ishizuka, A. Murakami, J. S. Kang, F. Liu, T. J. Wang, S. Ebara, D. Y. Kim, Tsunehiko Omori, S. Lusin, P. N. Kirk, Y. Yamashita, K. Ohkubo, M. Oyoshi, R. L. Lander, Kazumasa Miyano, Susumu Terada, K. W. Park, D. K. Cho, L. E. Piilonen, Hiroyuki Sagawa, Suyong Choi, Y. S. Chung, Saroj Kumar Sahu, and S. Behari
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Annihilation, Electron–positron annihilation, media_common.quotation_subject, Elementary particle, Charge (physics), Asymmetry, lcsh:QC1-999, Standard Model, Nuclear physics, Cross section (geometry), Atomic physics, lcsh:Physics, media_common
Abstract: With data corresponding to 142 pb−1 accumulated at s = 57.8 GeV by the AMY detector at TRISTAN we measure the cross section of the reactions e+e− → μ+μ− and e+e− → τ+τ− and the symmetry in the angular distributions. For the lowest order cross section we obtain σμμ = 27.54 ± 0.65 ± 0.95 pb and σττ = 28.27 ± 0.87 ± 0.69 pb, and for the forward-backward asymmetry, Aμμ = 0.303 ± 0.027 ± 0.008 and Aττ = −0.291 ± 0.040 ± 0.019. These measurements agree with the standard model. Assuming e−μ−τ univrsality we extract the vector and axial coupling constants | gν| = 0.00 ± 0.09 and |gA| = 0.476 ± 0.024. A fit of data to composite models places lower bounds (95% confidence level) on the compositeness scale of 2–4 TeV.
Published: 1994

19. Measurements of the inclusive jet cross section in photon-photon interactions at TRISTAN

Author: J. R. Smith, S. Lusin, Takashi Sasaki, Saroj Kumar Sahu, S. Behari, Dong-Chul Son, David Stuart, Bj Kim, Stephen L. Olsen, M. H. Lee, Yoshimasa Kurihara, N. Morgan, S. K. Choi, T. Nozaki, C. Velisarris, Sunghee Kim, Kisoo Lee, K. Ohkubo, T. Ishizuka, F. Kajino, A. Maki, L. Y. Zheng, A. Murakami, Robert Stone, M. Shirai, K. Gotow, M. H. Ye, Kazumasa Miyano, Y. Fujii, Kazuo Abe, S. S. Myung, A. Abashian, W. G. Yan, C. Rosenfeld, T. Aso, J. S. Kang, Richard Breedon, K. Ueno, F. Liu, S. Kobayashi, A. Bodek, P. N. Kirk, J. Vinson, M. Oyoshi, Susumu Terada, T. Kumita, W. X. Gao, F. Sannes, S. Ebara, C. P. Cheng, K. L. Sterner, D. Haim, T. Thomas, Winston Ko, Ryuki Tanaka, Y. Takaiwa, S. Kanda, D. Y. Kim, R. L. Lander, D. K. Cho, L. E. Piilonen, C. A. Fry, Y. K. Li, S. Wilson, Y. Yamashita, J. Rowe, S. Matsumoto, R. C. Walker, Steve Schnetzer, N. Takashimizu, K. W. Park, Yasuhiro Sugimoto, M. E. Mattson, Y. S. Chung, L. M. Chinitz, Hiroyuki Sagawa, Tsunehiko Omori, H. Miyata, and Y. Sakai
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, High Energy Physics::Phenomenology, Detector, Physics::Optics, Parton, Jet (particle physics), Photon structure function, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Perturbation theory (quantum mechanics)
Abstract: We present cross section measurements for inclusive jet production in almost-real photon-photon interactions at TRISTAN using the AMY detector. The results are compared with leading-order QCD calculations for different parameterizations of the parton density in the photon.
Published: 1994

20. Measurement of α from the moment of particle momenta within jets from e+e- annihilation

Author: Robert Stone, David Stuart, Kisoo Lee, Kazuo Abe, A. Abashian, Sun Kee Kim, J. R. Smith, F. Sannes, T. Thomas, W. X. Gao, Kazumasa Miyano, B. J. Kim, S. Kanda, R. C. Walker, M. Oyoshi, Steve Schnetzer, Takashi Sasaki, Ko Winston, N. Takashimizu, J. Rowe, M. E. Mattson, Richard Breedon, Dong-Chul Son, L. E. Piilonen, C. Rosenfeld, A. Bodek, W. G. Yan, Yasuhiro Sugimoto, Y. S. Chung, M. H. Ye, Hiroyuki Sagawa, C. Velisarris, S. L. Olsen, R. L. Lander, S. K. Choi, K. Gotow, Y. Fujii, K. Ueno, J. Vinson, Y. K. Li, P. N. Kirk, Susumu Terada, T. Kumita, S. Wilson, D. Haim, N. Morgan, F. Liu, M. E. Zomorrodian, S. Kobayashi, Y. Yamashita, Tsunehiko Omori, Yoshimasa Kurihara, Saroj Kumar Sahu, L. M. Chinitz, C. P. Cheng, T. Nozaki, J. S. Kang, A. Murakami, T. Aso, H. Miyata, C. A. Fry, M. H. Lee, S. Ebara, Y. Sakai, K. W. Park, T. Ishizuka, R. Poling, Ryuki Tanaka, Y. Takaiwa, S. Matsumoto, A. Maki, L. Y. Zheng, F. Kajino, S. S. Myung, K. L. Sterner, and S. Lusin
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Logarithm, Electron–positron annihilation, High Energy Physics::Phenomenology, Jet (particle physics), Nuclear physics, Momentum, Moment (mathematics), Particle, High Energy Physics::Experiment
Abstract: We present a study of the third moment of the inclusive momentum distribution of particles within jets produced by e+e- annihilation at TRISTAN. In this analysis, the QCD coupling strength alpha(s) is determined by fits to the prediction of the Next-to-Leading Logarithm Parton-Shower model. The measured value of alpha(s) (57.9 GeV) = 0.134(-0.005)+0.006.
Published: 1993

21. Search for anomalous γγ production at TRISTAN

Author: K.L. Sterner, A. Abashian, K. Gotow, D. Haim, M.E. Mattson, N. Morgan, L. Piilonen, P. Kirk, C.P. Cheng, W.X. Gao, W.G. Yan, M.H. Ye, S. Lusin, C. Rosenfeld, A.T.M. Wang, S. Wilson, L.Y. Zheng, C.A. Fry, R. Tanaka, R.E. Breedon, L.M. Chinitz, Winston Ko, R.L. Lander, J. Rowe, J.R. Smith, D. Stuart, S. Kanda, S.L. Olsen, K. Ueno, K. Abe, Y. Fujii, Y. Kurihara, F. Liu, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, T. Sasaki, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, F. Kajino, R. Poling, T. Thomas, T. Aso, K. Miyano, H. Miyata, M. Oyoshi, M.H. Lee, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, Y. Yamashita, A. Bodek, B.J. Kim, T. Kumita, Y.K. Li, C. Velisarris, S. Kobayashi, A. Murakami, S.K. Sahu, Y.S. Chung, J.S. Kang, K.B. Lee, K.W. Park, S.K. Kim, S.S. Myung, S.K. Choi, D. Son, S. Ebara, S. Matsumoto, N. Takashimizu, and T. Ishizuka
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, law, Detector, Resonance, High Energy Physics::Experiment, Production (computer science), Collider, law.invention, Gamma gamma
Abstract: We report on measurements of the total cross section for e+e- --> 2-Gamma for center-of-mass energies between 57.4 and 59.5 GeV, using the AMY detector at the TRISTAN collider. We set new limits on the production of a possible new s-channel resonance decaying into photon pairs.
Published: 1993

22. Evidence for hard scattering of hadronic constituents of photons in photon-photon collisions of TRISTAN

Author: Hiroyuki Sagawa, K. Gotow, R. L. Lander, C. Rosenfeld, S. Wilson, Richard Breedon, K. Tomioka, R. C. Walker, Steve Schnetzer, S. S. Myung, L. E. Piilonen, Y. Takaiwa, M. Frautschi, S. Matsumoto, J. Vinson, S. K. Choi, E. H. Low, A. Murakami, F. Sannes, David Stuart, S. Kanda, A. Bacala, K. P. Hu, E. Araki, A. T.M. Wang, T. Nozaki, Y. Oshi, T. Ishizuka, W. G. Yan, H. Kagan, C. P. Cheng, A. Z. Lai, Sun Kee Kim, S. L. Olsen, T. Kumita, Dong-Chul Son, Y. K. Li, C. Velisarris, J. S. Kang, P. N. Kirk, Kazuo Abe, J. Lim, Takashi Sasaki, J. R. Smith, T. Kojima, Yoshimasa Kurihara, Robert Stone, S. Lusin, Tsunehiko Omori, Y. Yamashita, K. Ueno, Yusuke Higashi, Kaori Maeshima, W. X. Gao, P. Gu, M. E. Mattson, H. Miyata, Kazumasa Miyano, C. A. Fry, R. L. Malchow, M. H. Ye, A. Sill, H. Yoshinaka, Yongsun Kim, B. J. Kim, A. Maki, R. D. Kass, Moo Hyun Lee, Winston Ko, S. Kobayashi, Susumu Terada, R. Poling, T. Thomas, D. Blanis, A. Abashian, K. L. Sterner, Rr Mcneil, F. Kajino, R. Tanaka, J. Rowe, A. Bodek, Y. Sakai, Yasuhiro Sugimoto, and Y. Fujii
Subjects: Physics, Nuclear physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Scattering, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract: We present results of an experimental study of e+e−+ hadrons in the kinematic regime for which the process is interpreted as hadron production in collisions of almost-real photons. The data sample corresponds to an integrated luminosity of 27.5 pb− and covers center-of-mass energies from 55 to 61.4 GeV. We observe more events than expected from the incoherent sum of quark-parton and vector-meson-dominance models, and we give a quantitative explanation of the excess by including the hard scattering of the hadronic constituents of the photons calculated with QCD.
Published: 1992

23. A measurement of the photon structure function F2

Author: J. Rowe, A. Bodek, Richard Breedon, T. Kumita, Y. Sugimoto, E. H. Low, Robert Stone, David Stuart, S. Kanda, M. E. Mattson, T. Nozaki, H. Kagan, J. S. Kang, Y. Ishi, C. Velisarris, E. J. Kim, Takashi Sasaki, Kazumasa Miyano, A. Murakami, Yusuke Higashi, K. Ueno, J. Vinson, L. E. Piilonen, J. R. Smith, P. N. Kirk, T. Kojima, T. Yasuda, Y. C. Zhu, Y. Yamashita, Kazuo Abe, S. L. Olsen, C. A. Fry, K. Gotow, S. K. Choi, M. H. Ye, N. M. Shaw, R. L. Malchow, H. Miyata, E. H. Thorndike, Hiroyuki Sagawa, C. P. Cheng, J. Lim, Kaori Maeshima, Yongsun Kim, A. T.M. Wang, M. Frautschi, W. Metcalf, Y. Yamagishi, H. Harada, R. D. Kass, B. J. Kim, Y. Takaiwa, Sarah Catherine Eno, P. Gu, Susumu Terada, A. Bacala, H. S. Budd, C. Rosenfeld, T. Ishizuka, A. Sill, R. L. Lander, Dong-Chul Son, Tsunehiko Omori, Yoshimasa Kurihara, S. Matsumoto, S. S. Myung, H. W. Zheng, Moo Hyun Lee, K. Ohta, S. Schenetzer, Winston Ko, P. Auchincloss, S. Kobayashi, F. Sannes, Y. H. Ho, Hyunyong Kim, K. P. Hu, D. H. Han, A. Maki, G. N. Kim, Y. K. Li, S. Lusin, S. Wilson, R. Poling, R. C. Walker, D. Blanis, R. Tanaka, K. L. Sterner, A. Z. Lai, Rr Mcneil, S. K. Kim, F. Kajino, Y. Fujii, Y. Sakai, T. Thomas, and A. Abashian
Subjects: Quantum chromodynamics, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Structure function, Range (statistics), High Energy Physics::Experiment, Photon structure function
Abstract: The photon structure function F2 has been measured at average Q2 values of 73,160 and 390 ( GeV c ) 2 . We compare the x dependence of the Q2 = 73 ( GeV c ) 2 data with theoretical expectations based on QCD. In addition we present results on the Q2 evolution of the structure function for the intermediate x range (0.3⩽ x ⩽0.8). The results are consistent with QCD.
Published: 1990

24. Observation of anomalous production of muon pairs in e+e− annihilation into four-lepton final states

Author: S. S. Myung, H. W. Zheng, H. Kagan, M. H. Ye, Rr Mcneil, E. H. Thorndike, J. Lim, A. Maki, M. E. Mattson, A. Bodek, C. A. Fry, Gordon Watts, S. K. Kim, Y. Ishi, R. C. Walker, Steve Schnetzer, Tsunehiko Omori, D. H. Han, P. Gu, H. Ichinose, Hiroyuki Sagawa, F. Kajino, Y. Sakai, M. Dickson, S. Lusin, T. Thomas, Yoshimasa Kurihara, Kazuo Abe, J. Li, David Stuart, P. N. Kirk, T. Nozaki, R. L. Malchow, C. Velissaris, Yasuhiro Sugimoto, L. E. Piilonen, W. Metcalf, N. M. Shaw, Yongsun Kim, Kaori Maeshima, Y. Yamashita, E. J. Kim, H. S. Budd, Y. Yamagishi, C. P. Cheng, M. Frautschi, R. D. Kass, R. Tanaka, Y. Takaiwa, Takashi Sasaki, Y. C. Zhu, H. Miyata, S. L. Olsen, Hyunyong Kim, E. H. Low, G. N. Kim, A. Bacala, Dong-Chul Son, M. H. Lee, F. Sannes, A. Sill, A. Murakami, K. P. Hu, Y. Fujii, S. Wilson, D. Blanis, K. Ohta, A. Abashian, T. Kojima, J. R. Smith, Winston Ko, Yusuke Higashi, S. Matsumoto, T. Yasuda, S. Kobayashi, Y. H. Ho, R. Imlay, K. Gotow, K. L. Sterner, C. Rosenfeld, A. T.M. Wang, T. Mori, C. G. Trahern, T. Kumita, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, B. J. Kim, Y. K. Li, R. Poling, R. L. Lander, Robert Stone, H. Harada, P. Auchincloss, Richard Breedon, J. Vinson, D. Perticone, J. S. Kang, K. Ueno, I. H. Park, J. Liu, and T. Ishizuka
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Muon, Electron–positron annihilation, Bremsstrahlung, law.invention, Nuclear physics, Angular distribution, law, Beam direction, High Energy Physics::Experiment, Nuclear Experiment, Collider, Lepton
Abstract: We report results of a study of four-lepton final states produced in e+e− collisions at center-of-mass energies from 50 to 61.4 GeV using the AMY detector at the TRISTAN collider. For the cases where two or three charged tracks are produced at large angles relative to the beam direction, the cross sections agree with QED. However, we observe an excess of e+e−→e+e−μ+μ− events with four tracks at wide angles and with dimuon mass less than 1.0 GeV/c2.
Published: 1990

25. A search for leptoquark and colored lepton pair production in e+e− annihilations at TRISTAN

Author: E. H. Thorndike, Y. Sugimoto, P. Auchincloss, J. Lim, T. Nozaki, A. T.M. Wang, J. R. Smith, P. Gu, Hyunyong Kim, M. H. Lee, C. Rosenfeld, W. Metcalf, T. Kojima, I. H. Park, T. Yasuda, Y. Fujii, E. J. Kim, Dong-Chul Son, S. Wilson, David Stuart, J. Liu, F. Sannes, Takashi Sasaki, K. Gotow, K. P. Hu, T. Ishizuka, P. N. Kirk, R. Imlay, M. Frautschi, Tsunehiko Omori, Y. K. Li, A. Bacala, R. R. McNeill, S. K. Kim, Y. Yamashita, Yusuke Higashi, Y. C. Zhu, S. L. Olsen, D. H. Han, Richard Breedon, G. N. Kim, S. Matsumoto, A. Maki, N. M. Shaw, R. Poling, T. Mori, F. Kajino, C. A. Fry, D. Perticone, Y. Sakai, M. H. Ye, A. Abashian, J. S. Kang, M. E. Mattson, J. Vinson, J. Li, R. L. Lander, L. E. Piilonen, R. L. Malchow, Y. Ishi, R. Tanaka, K. Ueno, Y. Takaiwa, C. G. Trahern, E. H. Low, Robert Stone, S. Lusin, T. Kumita, R. D. Kass, T. Thomas, A. Murakami, C. P. Cheng, Hiroyuki Sagawa, A. Sill, R. C. Walker, Steve Schnetzer, Yk Kim, K. Ohta, D. Blanis, Winston Ko, H. Miyata, Kazuo Abe, S. Kobayashi, Kazumasa Miyano, Kaori Maeshima, Yoshimasa Kurihara, H. S. Budd, Y. Yamagishi, K. L. Sterner, Sarah Catherine Eno, Susumu Terada, H. Harada, H. Kagan, A. Bodek, S. S. Myung, and H. W. Zheng
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Pair production, Colored, Electron–positron annihilation, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Leptoquark, Lepton
Abstract: We report on a search for the pair production of leptoquarks and colored leptons in e + e − annihilations t center-of-mass energies from 50 to 60.8 GeV, using the AMY detector at TRISTAN. No evidence for such particles is found and 95% CL mass limits are given.
Published: 1990

26. A search for SUSY particles in e +e − annihilations at s=50–60.8GeV

Author: K. Gotow, Y. Fujii, T. Mori, H. Kagan, H. Itoh, Yasuhiro Sugimoto, Y. T. Xu, A. Maki, E. H. Low, C. G. Trahern, T. Kumita, I. H. Park, Tsunehiko Omori, W. Metcalf, S. Matsumoto, Kazuo Abe, Z. P. Mao, S. Lusin, Y. K. Li, T. Ishizuka, J.S. Kang, A. Bacala, M. C.S. Williams, S. Kobayashi, R. C. Walker, M. Frautschi, H. Harada, Kaori Maeshima, Steve Schnetzer, A. T.M. Wang, A. Murakami, D. Perticone, P. Auchincloss, Y. Yamagishi, T. Kojima, S. Wilson, E.J. Kim, R. L. Lander, F. Sannes, G. N. Kim, T. Yasuda, P. N. Kirk, K. Ueno, J. Li, K. P. Hu, A. Bodek, M.H. Lee, Robert Stone, J. R. Smith, Hiroyuki Sagawa, Richard Breedon, Y. Yamashita, R. L. Malchow, Yusuke Higashi, R. L. Imlay, Yongsun Kim, C. P. Cheng, J. Vinson, R. D. Kass, D. Son, M. E. Mattson, N. M. Shaw, Y. Ishi, C. Rosenfeld, H. S. Budd, H. Miyata, Y. Sakai, Ryuki Tanaka, Y. Takaiwa, K. Toyoshima, T. Thomas, S. S. Myung, H. W. Zheng, R. Poling, A. Abashian, Yoshimasa Kurihara, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, H. J. Kim, D. Blanis, K. L. Sterner, E. H. Thorndike, J. Lim, D.H. Han, P. Gu, H. Yokota, David Stuart, S. K. Kim, Y. C. Zhu, S. L. Olsen, F. Kajino, R. R. McNeil, A. Sill, C. A. Fry, K. Ohta, Y. H. Ho, L. E. Piilonen, M. H. Ye, KO Winston, T. Nozaki, and Takashi Sasaki
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Supersymmetry, lcsh:QC1-999, Nuclear physics, Pair production, Higgs boson, High Energy Physics::Experiment, lcsh:Physics, Lepton
Abstract: Searches for the pair production of the supersymmetric partner particles of leptons, quarks, and non-minimal Higgs have been made in e + e − annihilations at center-of-mass energies between 50 and 60.8 GeV using the AMY detector at TRISTAN. No evidence for their existence is observed and 95% CL mass limits are presented.
Published: 1990

27. RadiativeBMeson Decays intoKπγandKππγFinal States

Author: S. Nishida, M. Nakao, K. Abe, T. Abe, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, W. Bartel, A. Bay, I. Bedny, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. Fukunaga, N. Gabyshev, T. Gershon, A. Gordon, K. Gotow, R. Guo, J. Haba, T. Hara, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, T. Igaki, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, P. Jalocha, H. K. Jang, J. H. Kang, P. Kapusta, S. U. Kataoka, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, T. H. Kim, K. Kinoshita, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, Y.-J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, R.-S. Lu, J. MacNaughton, G. Majumder, F. Mandl, S. Matsumoto, T. Matsumoto, Y. Mikami, W. Mitaroff, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, J. W. Nam, Z. Natkaniec, K. Neichi, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, L. S. Peak, J.-P. Perroud, M. Peters, L. E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, S. Uno, Y. Ushiroda, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, Y. Yuan, Y. Yusa, J. Zhang, Z. P. Zhang, V. Zhilich, and D. Žontar
Subjects: Physics, General Physics and Astronomy
Published: 2002

28. Improved measurement of mixing-inducedCPviolation in the neutralBmeson system

Author: K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, A. Bay, P. K. Behera, I. Bizjak, A. Bondar, A. Bozek, M. Bračko, J. Brodzicka, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, Y. Choi, Y. K. Choi, M. Danilov, L. Y. Dong, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, K. Gotow, R. Guo, J. Haba, K. Hanagaki, F. Handa, K. Hara, T. Hara, Y. Harada, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, L. Hinz, T. Hojo, T. Hokuue, Y. Hoshi, W.-S. Hou, H.-C. Huang, T. Igaki, Y. Igarashi, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, H. K. Jang, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, K. Kinoshita, S. Kobayashi, K. Korotushenko, S. Korpar, P. Križan, P. Krokovny, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, G. Leder, S. H. Lee, J. Li, A. Limosani, J. MacNaughton, G. Majumder, F. Mandl, D. Marlow, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. L. Olsen, Y. Onuki, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. W. Park, H. Park, K. S. Park, J.-P. Perroud, L. E. Piilonen, F. J. Ronga, N. Root, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, C. Schwanda, S. Semenov, K. Senyo, R. Seuster, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, N. Soni, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, H. Tajima, T. Takahashi, F. Takasaki, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, S. Tokuda, T. Tomura, K. Trabelsi, W. Trischuk, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, N. Uozaki, Y. Ushiroda, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, H. Yanai, J. Yashima, P. Yeh, M. Yokoyama, Y. Yuan, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, Z. P. Zhang, V. Zhilich, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, FOS: Physical sciences, Resonance, High Energy Physics - Experiment, Standard Model, High Energy Physics - Experiment (hep-ex), KEKB, Mixing (mathematics), CP violation, High Energy Physics::Experiment, B meson
Abstract: We present an improved measurement of the standard model CP violation parameter sin2phi_1 (also known as sin2beta) based on a sample of 85 times 10^6 B Bbar pairs collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. One neutral B meson is reconstructed in a J/psi K_S, psi(2S) K_S, chi_{c1} K_S, eta_c K_S, J/psi K^{*0}, or J/psi K_L CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time interval between the two B meson decay points, we obtain sin2phi_1 = 0.719 +/- 0.074(stat) +/- 0.035(syst)., Comment: 10 pages, 3 figures, 3 tables, accepted for publication in PRD Rapid Communications
Published: 2002

29. Observation ofχc2Production inBMeson Decay

Author: K. Abe, T. Abe, I. Adachi, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, Y. Ban, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, M. Bračko, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, B. Golob, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W.-S. Hou, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D. J. Jackson, H. K. Jang, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, H. Konishi, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, G. Leder, S. H. Lee, A. Limosani, D. Liventsev, R.-S. Lu, J. MacNaughton, F. Mandl, D. Marlow, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, K. S. Park, L. S. Peak, J.-P. Perroud, M. Peters, L. E. Piilonen, F. Ronga, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, M. Yokoyama, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, KEKB, Meson, Branching fraction, General Physics and Astronomy
Abstract: We report the first observation of ${\ensuremath{\chi}}_{c2}$ production in $B$ meson decays. We find an inclusive $B\ensuremath{\rightarrow}{\ensuremath{\chi}}_{c2}X$ branching fraction of $({1.80}_{\ensuremath{-}0.28}^{+0.23}\ifmmode\pm\else\textpm\fi{}0.26)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}3}$. The data set, collected with the Belle detector at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ collider, consists of $31.9\ifmmode\times\else\texttimes\fi{}{10}^{6}$ $B\overline{B}$ events. We also present branching fractions and momentum spectra for both ${\ensuremath{\chi}}_{c1}$ and ${\ensuremath{\chi}}_{c2}$ production.
Published: 2002

30. Measurements of Branching Fractions and Decay Amplitudes in B-> J/\psi K^* decays

Author: K. Abe, T. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, Y. Ban, E. Banas, A. Bay, P.K. Behera, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, Y. Chao, B.G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, M. Danilov, L.Y. Dong, S. Eidelman, V. Eiges, Y. Enari, F. Fang, C. Fukunaga, T. Gershon, K. Gotow, R. Guo, J. Haba, K. Hanagaki, T. Hara, H. Hayashii, M. Hazumi, E.M. Heenan, I. Higuchi, T. Higuchi, T. Hokuue, Y. Hoshi, S.R. Hou, W.-S. Hou, H.-C. Huang, T. Igaki, T. Iijima, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, M. Iwamoto, H. Iwasaki, Y. Iwasaki, P. Jalocha, J.H. Kang, J.S. Kang, P. Kapusta, S.U. Kataoka, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, H.O. Kim, Hyunwoo Kim, K. Kinoshita, S. Korpar, P. Križan, P. Krokovny, R. Kulasiri, S. Kumar, Y.-J. Kwon, J.S. Lange, G. Leder, S.H. Lee, D. Liventsev, J. MacNaughton, G. Majumder, T. Matsuishi, S. Matsumoto, T. Matsumoto, W. Mitaroff, K. Miyabayashi, Y. Miyabayashi, H. Miyake, H. Miyata, G.R. Moloney, S. Mori, T. Mori, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, F. Ohno, T. Ohshima, T. Okabe, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C.W. Park, H. Park, K.S. Park, L.E. Piilonen, M. Rozanska, K. Rybicki, H. Sagawa, S. Saitoh, Y. Sakai, M. Satapathy, A. Satpathy, O. Schneider, S. Schrenk, S. Semenov, K. Senyo, R. Seuster, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, T. Takahashi, F. Takasaki, N. Tamura, M. Tanaka, G.N. Taylor, Y. Teramoto, S. Tokuda, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, S. Uno, S.E. Vahsen, G. Varner, K.E. Varvell, C.H. Wang, J.G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, A. Yamaguchi, Y. Yamashita, M. Yamauchi, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, J. Zhang, Z.P. Zhang, V. Zhilich, Z.M. Zhu, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Meson, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics::Cosmology and Extragalactic Astrophysics, Branching (polymer chemistry), Helicity, law.invention, High Energy Physics - Experiment, Transverse plane, Angular distribution, Amplitude, KEKB, law, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Collider, Astrophysics::Galaxy Astrophysics
Abstract: The branching fractions and the decay amplitudes of B -> J/psi K^* decays are measured in a 29.4/fb data sample collected with the Belle detector at the KEKB electron-positron collider. The decay amplitudes of helicity states of the J/psi K^* system are determined from the full angular distribution of the final state particles in the transversity basis. The branching fractions are measured to be (1.29\pm0.05\pm0.13) \times 10^{-3} for neutral mesons and (1.28\pm0.07\pm0.14) \times 10^{-3} for charged mesons. The measured longitudinal and transverse (perpendicular to the transversity plane) amplitudes are |A_0|^2 = 0.62\pm0.02\pm0.03 and |A_{\perp}|^2 = 0.19\pm0.02\pm0.03, respectively. The value of |A_{\perp}|^2 shows that the CP even component dominates in the B^0 \to J/\psi K^{*0}(K_S\pi^0) decay., Comment: 17 pages, 3 figures, 5 tables, to appear in Phys. Lett. B
Published: 2002

31. Observation of the Color-Suppressed DecayB¯0→D0π0

Author: K. Abe, R. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, F. Fang, H. Fujii, M. Fukushima, N. Gabyshev, A. Garmash, T. Gershon, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, T. Hokuue, K. Hoshina, S. R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D. J. Jackson, H. K. Jang, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, H. O. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Kobayashi, H. Konishi, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, S. H. Lee, D. Liventsev, R.-S. Lu, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, K. S. Park, L. S. Peak, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Nuclear physics, Physics, Electron–positron annihilation, General Physics and Astronomy, Omega
Published: 2002

32. Measurement of the inclusive semileptonic branching fraction of B mesons and |Vcb

Author: Sadaharu Uehara, S. Noguchi, A. Garmash, K. Neichi, Z. Natkaniec, N. Gabyshev, You-Jin Yuan, Hirokazu Ishino, S. Tokuda, J. W. Nam, Y. Unno, Y. Zheng, D. Liventsev, Kazuo Abe, B. D. Yabsley, T. Hara, P. Pakhlov, F. Handa, Suneel Kumar, S. N. Tovey, G. R. Moloney, M. Bračko, O. Nitoh, D. Žontar, B.A. Shwartz, Y. Miyabayashi, H. Kawai, T. Hojo, K. Senyo, Y. J. Kwon, Y. Asano, T. Aushev, S. Okuno, K. Hara, K. S. Park, T. Tomura, Rong-Shyang Lu, T. Matsuishi, Y. Choi, H. Miyake, A. Satpathy, T. Iijima, Zhenyu Zhang, Y. Ushiroda, G. Leder, R. Guo, Hiroaki Aihara, J. Zhang, S. L. Olsen, L. S. Peak, R. Itoh, K. Hyunwoo, S. Suzuki, T. Abe, V.A. Sidorov, Y. Nagasaka, N. Katayama, F. Mandl, K. Inami, F. Fang, Tsukasa Aso, S. Nishida, Antonio Limosani, K. Tamai, A.S. Kuzmin, Kazunori Hanagaki, Ho Kim, Gobinda Majumder, Hiroyuki Iwasaki, B. C. K. Casey, M. E. Sevior, Y. Kawakami, S.I. Eidelman, K. Rybicki, T. Tsukamoto, J. Kaneko, S. K. Choi, S. R. Hou, A. Bozek, M. Z. Wang, S. Saitoh, K. Gotow, T. Matsumoto, C. W. Park, M. Tanaka, S. Matsumoto, I. Adachi, P. Kapusta, W. Ostrowicz, M. Satapathy, G. N. Taylor, H. Miyata, H. K. Jang, P. Krokovny, Prafulla Kumar Behera, A. Drutskoy, Byung Gu Cheon, T. J. Gershon, C. C. Zhang, I. Bedny, J. Li, Shih-Chieh Hsu, Y. Hoshi, Chikara Fukunaga, Y. Sakai, T. Ohshima, H. Shibuya, Elzbieta Banas, T. Okabe, E. M. Heenan, V. Eiges, S. A. Byoung, M. Yamauchi, D. W. Kim, Kyo Yoshida, S. U. Kataoka, S. Stanič, S. Uno, C. Schwanda, J. Yashima, T. E. Browder, T. Higuchi, M. Nakao, Kei Suzuki, N. Kawamura, T.H. Kim, I. Higuchi, V.N. Zhilich, Yong Ban, Y. Igarashi, H. Hayashii, Y. Chao, A. Ishikawa, A. Bay, Y. Teramoto, T. Nakadaira, S. Semenov, T. Nozaki, F. Takasaki, T. Hokuue, W. A. Mitaroff, H. J. Kim, Z.M. Zhu, C. C. Wang, E. Nakano, M. Danilov, Yasuhiko Yamada, J. S. Kang, J. P. Perroud, K. Trabelsi, T. Takahashi, Junichi Tanaka, M. Akatsu, K. Miyabayashi, J. G. Wang, Y. Iwasaki, F. J. Ronga, K. Ueno, A. Yamaguchi, V.M. Aulchenko, Hiroshi Sakamoto, Jasvinder A. Singh, T. Mori, Y. Yusa, S. Kobayashi, C. H. Wang, Y. Watanabe, Yuji Enari, H. Kichimi, H. K. Park, T. Tsuboyama, Makoto Tomoto, A. Sugiyama, Y. Yamashita, H. Ozaki, K. Heejong, Seong Keun Kim, N.I. Root, N. Tamura, M. D. Peters, S. H. Lee, T. Igaki, Y. Mikami, P. Chang, T. Nagamine, H. C. Huang, M. Shimoyama, H. Kakuno, A. Sugi, S. Ogawa, Hiroyuki Sagawa, H. Palka, L. E. Piilonen, R. Kulasiri, T. Kawasaki, R. Chistov, T. Sumiyoshi, S. K. Swain, A. Bondar, Jolanta Brodzicka, K. Sumisawa, S. Y. Suzuki, Masashi Hazumi, Ju Hwan Kang, Kevin Varvell, W. S. Hou, K. Kinoshita, J. S. Lange, N. C. Hastings, A. M. Bakich, B. Golob, O. Schneider, L. Y. Dong, F. Ohno, E. Won, and J. MacNaughton
Subjects: Minimal model, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics - Experiment (hep-ex), Branching fraction, FOS: Physical sciences, Matrix element, B meson, Electron, High Energy Physics - Experiment, Lepton
Abstract: We present a measurement of the electron spectrum from inclusive semileptonic {\it B} decay, using 5.1 fb$^{-1}$ of $\Upsilon(4S)$ data collected with the Belle detector. A high-momentum lepton tag was used to separate the semileptonic {\it B} decay electrons from secondary decay electrons. We obtained the branching fraction, ${\cal B}(B\to X e^+ \nu) = (10.90 \pm 0.12 \pm 0.49)%$, with minimal model dependence. From this measurement, we derive a value for the Cabibbo-Kobayashi-Maskawa matrix element $|V_{cb}| = 0.0408 \pm 0.0010 {\rm (exp)} \pm 0.0025{\rm (th)}$., Comment: 16 pages, 3 figures, 3 tables
Published: 2002
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33. Search for directCPviolation inB→Kπdecays

Author: K. Abe, R. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W. -S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, H. Konishi, P. Krokovny, R. Kulasiri, S. Kumar, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J. S. Lange, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, E. Nakano, M. Nakao, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, S. Stanič, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, K. Yoshida, Y. Yusa, H. Yuta, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics
Published: 2001

34. Measurement of inclusive production of neutral pions fromΥ(4S)decays

Author: Yasuo Doi, Shih-Chieh Hsu, K. Hayashi, M. Tanaka, Y. Yamashita, S. Eidelman, A. Satpathy, Shigeki Mori, Hyunwoo Kim, I. Higuchi, S. Uno, A. Bozek, T. Nagamine, S. Noguchi, H. C. Huang, J. Haba, A. Drutskoy, J. H. Kang, A. M. Bakich, Z. Natkaniec, T. Ohshima, D. J. Jackson, D. Beiline, K. Aoki, K. Sumisawa, S. Y. Suzuki, Matthew Jones, Kazunori Hanagaki, K. Neichi, Hiroshi Yamaoka, Masashi Hazumi, Rong-Shyang Lu, O. Nitoh, T. Sumiyoshi, T. E. Browder, Shiro Suzuki, M. Yamauchi, K. Ueno, Y. Chao, A. Sugiyama, Kiyoshi Asai, M. Rozanska, H. B. Li, D. W. Kim, J. Ryuko, S. Yanaka, I. Adachi, A. Kuzmin, Hirokazu Ikeda, H. Kakuno, S. Ogawa, Y. Watanabe, Y. Iwasaki, T. Tomura, C. C. Zhang, H. Shibuya, W. Ostrowicz, M. Yamaga, Hiroyuki Iwasaki, Kevin Varvell, T. Tsukamoto, Y. J. Kwon, W. S. Hou, A. Sugi, Yuji Enari, T. Tsuboyama, K. Korotushenko, Sun Kee Kim, Hiroshi Sakamoto, H. Fujii, R. Enomoto, S. Behari, H. Aihara, Y. Ushiroda, Masaki Fukushima, A. Ishikawa, B. Shwartz, F. Takasaki, Chikara Fukunaga, N.I. Root, S. Ichizawa, J. B. Singh, Y. Tanaka, S. K. Choi, Gianluca Alimonti, S. Nishida, T. Iijima, T. J. Wang, H. Palka, L. E. Piilonen, K. Suzuki, T. Nozaki, N. C. Hastings, Y. Mikami, L. S. Peak, R. Kulasiri, J. L. Rodriguez, S. Matsui, T. Kuniya, E. M. Heenan, H. Miyake, W. Bartel, Byung Gu Cheon, P. Chang, V.A. Sidorov, L.C. Moffitt, Y. C. Huang, Yoshio Yamaoka, C. H. Wang, S. Narita, Heejong Kim, Takahiko Matsubara, Y. Zheng, M. H. Lee, R. Guo, A. Murakami, A. Manabe, Byoung Sup Ahn, Y. Sakai, H. K. Jang, M. Nakao, E. Nakano, Kazuo Abe, Y. Asano, P. Kapusta, S. Okuno, J. S. Kang, S. Uehara, K. Kichimi, K. Hara, N. Katayama, Tomiyoshi Haruyama, T. Okazaki, Ascelin Gordon, B. C. K. Casey, Takuya Higuchi, R. Kagan, A. Yamaguchi, H. Hirano, T. Nakadaira, K. Rybicki, K. Tamai, E.J. Prebys, T. Takahashi, Y. Teramoto, Bruce Yabsley, C. W. Park, E. Won, Elzbieta Banas, T. Okabe, A. Garmash, Hirokazu Ishino, V. M. Aulchenko, H. Yamamoto, E. Kurihara, S. N. Tovey, M. E. Sevior, D. Žontar, H. Kawai, H. Yuta, Y. Yusa, H. J. Kim, S. Matsumoto, S. E. Vahsen, V.N. Zhilich, M. Takita, M. Satapathy, Hyangkyu Park, F. Handa, Yasushi Nagasaka, J. Zhang, S. Semenov, Makoto Tomoto, Y. Choi, T. Hara, Yuichi Tsujita, H. Guler, N. Kawamura, K. Miyabayashi, J. Tanaka, H. Ozaki, Kyo Yoshida, M. D. Peters, S. H. Lee, N. Tamura, G. F. Moorhead, K. Trabelsi, T. Aushev, Y. Igarashi, T. Matsumoto, P. Krokovny, K. Misono, Shaji Kumar, H. Hayashii, T. Aso, S. L. Olsen, H. Miyata, Prafulla Kumar Behera, Y. Hoshi, M. Z. Wang, K. Kinoshita, Y. Nagashima, G. N. Taylor, J. S. Lange, H. Hamasaki, J. W. Nam, J. Dragic, C. C. Wang, S. Schrenk, Hiroyuki Sagawa, Yasuhiko Yamada, M. Akatsu, G. R. Moloney, Y. Unno, D. Liventsev, Go Iwai, K. Inami, T. Hojo, Changwon Park, Y. Higasino, P. Jalocha, Yasuhiro Ohshima, G. S. Varner, R. Itoh, F. Fang, Yu. V. Usov, K. Ikeda, J. Kaneko, K. Gotow, S. K. Swain, K. Senyo, T. Kawasaki, S. Stanič, and A. Bondar
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, KEKB, Pion, Electron–positron annihilation, Multiplicity (chemistry), Storage ring
Abstract: Using the Belle detector operating at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ storage ring, we have measured the mean multiplicity and momentum spectrum of neutral pions from the decays of the $\ensuremath{\Upsilon}(4S)$ resonance. We measure a mean of $4.70\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.22$ neutral pions per $\ensuremath{\Upsilon}(4S)$ decay.
Published: 2001

35. Observation of Cabibbo SuppressedB→D(*)K−Decays at Belle

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, W. Bartel, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, M. H. Lee, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, S. Narita, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanic̆, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Z̆ontar
Subjects: Nuclear physics, Physics, Crystallography, KEKB, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, General Physics and Astronomy
Abstract: We report observations of the Cabibbo suppressed decays B{yields}D{sup (*)}K{sup -} using a 10.4 fb{sup -1} data sample accumulated at the {Upsilon}(4S) resonance with the Belle detector at the KEKB e{sup +}e{sup -} storage ring. We find that the ratios of Cabibbo suppressed to Cabibbo favored branching fractions are B(B{sup -}{yields}D{sup 0}K{sup -})/B(B{sup -} {yields}D{sup 0}{pi}{sup -})= 0.079{+-} 0.009{+-} 0.006 , B({bar B}{sup 0} {yields}D{sup +}K{sup -})/B({bar B}{sup 0 }{yields} D{sup +}{pi}{sup -}) =0.068 {+-}0.015 {+-}0.007 , B(B{sup -}{yields} D{sup *0}K{sup -}) /B(B{sup -} {yields}D{sup *0}{pi}{sup -})= 0.078{+-} 0.019{+-} 0.009 , and B({bar B}{sup 0}{yields} D{sup *+}K{sup -})/ B({bar B}{sup 0}{yields} D{sup *+}{pi}{sup -})=0.074{+-}0.015{+-} 0.006 . These are the first observations of the B{yields}D{sup +}K{sup -} , D{sup *0}K{sup -} , and D{sup *+}K{sup -} decay processes.
Published: 2001

36. Measurement of Branching Fractions forB→ππ,Kπ, andKKDecays

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, W. Bartel, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, S.-K. Choi, Y. Choi, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, M. H. Lee, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, S. Narita, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Nuclear physics, Physics, Particle physics, Pion, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, Resonance, B meson, Particle identification
Abstract: We report measurements of the branching fractions for $B^0\to\pi^+\pi^-$, $K^+\pi^-$, $K^+K^-$ and $K^0\pi^0$, and $B^+\to\pi^+\pi^0$, $K^+\pi^0$, $K^0\pi^+$ and $K^+\overline{K}{}^0$. The results are based on 10.4 fb$^{-1}$ of data collected on the $\Upsilon$(4S) resonance at the KEKB $e^+e^-$ storage ring with the Belle detector, equipped with a high momentum particle identification system for clear separation of charged $\pi$ and $K$ mesons. We find ${\cal B}(B^0\to\pi^+\pi^-) =(0.56^{+0.23}_{-0.20}\pm 0.04)\times 10^{-5}$, ${\cal B}(B^0\to K^+\pi^-) =(1.93^{+0.34 +0.15}_{-0.32 -0.06})\times 10^{-5}$, ${\cal B}(B^+\to K^+\pi^0) =(1.63^{+0.35 +0.16}_{-0.33 -0.18})\times 10^{-5}$, ${\cal B}(B^+\to K^0\pi^+) =(1.37^{+0.57 +0.19}_{-0.48 -0.18})\times 10^{-5}$, and ${\cal B}(B^0\to K^0\pi^0) =(1.60^{+0.72 +0.25}_{-0.59 -0.27})\times 10^{-5}$, where the first and second errors are statistical and systematic. We also set upper limits of ${\cal B}(B^+\to\pi^+\pi^0)
Published: 2001

37. Observation of LargeCPViolation in the NeutralBMeson System

Author: K. Abe, R. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. J. Gershon, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, Y. Higasino, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Kobayashi, S. Koishi, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J. S. Lange, G. Leder, M. H. Lee, S. H. Lee, C. Leonidopoulos, Y.-S. Lin, D. Liventsev, R.-S. Lu, J. MacNaughton, D. Marlow, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, Y. Settai, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, T. Yamanaka, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, CP violation, Resonance, High Energy Physics::Experiment, B meson, Standard Model
Abstract: We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ based on a $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is fully reconstructed as a $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$, $J/\ensuremath{\psi}{K}_{L}$, or $J/\ensuremath{\psi}{K}^{*0}$ decay and the flavor of the accompanying $B$ meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two $B$ meson decay points, we determine $\mathrm{sin}2{\ensuremath{\varphi}}_{1}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.99\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$. We conclude that we have observed $\mathrm{CP}$ violation in the neutral $B$ meson system.
Published: 2001

38. Study of electron-positron interactions

Author: K. Gotow, A. Abashian, and L. Philonen
Subjects: Quark, Physics, Particle physics, Muon, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Electroweak interaction, Elementary particle, Nuclear physics, Massless particle, Neutrino detector, High Energy Physics::Experiment, Neutrino, Lepton
Abstract: For the past seven years, this group has been interested in the study of tests of the Standard Model of Electroweak interactions. The program has centered about the AMY experiment which examines the nature of the final state products in electron-positron collisions in the center of mass energy range near 60 GeV. Results of these measurements have shown a remarkable consistency with the predictions of the minimal model of 3 quark and lepton generations and single charged and neutral intermediate bosons. No new particles or excited states have been observed nor has any evidence for departures in cross sections or angular asymmetries from expectations been observed. These conclusions have been even more firmly established by the higher energy results from the LEP and SLC colliders at center of mass energies of about 90 GeV. Our focus is shifting to the neutrino as a probe to electroweak interactions. The relative merit of attempting to observe neutrinos from point sources versus observing neutrinos generally is not easy to predict. The improved ability to interpret is offset by the probably episodic nature of the emission and irreproducibility of the results. In this phase of development, it is best to be sensitive to bothmore » sources of neutrinos. As a second phase of our program at Virginia Tech, we are studying the feasibility of detecting cosmic ray neutrinos in a proposed experiment which we have called NOVA. the results of the test setup will be instrumental in developing an optimum design. A third program we are involved in is the MEGA experiment at Los Alamos, an experiment to place a limit on the rate of muon decay to electron plus photon which is forbidden by the Standard Model.« less
Published: 1990

39. Inelastic scattering of π+ mesons from nuclei at 50 MeV

Author: T.P. Cleary, K. Gotow, F. Milder, C. W. Darden, E. E. Gross, F.E. Bertrand, B. M. Preedom, R.E. Edge, P.L. Roberson, D. G. Jenkins, M. Blecher, D. J. Malbrough, T. Marks, R. L. Burman, R.P. Redwine, M.A. Moinester, and C.A. Ludemann
Subjects: Scattering cross-section, Physics, Nuclear and High Energy Physics, Meson, Nuclear Theory, Continuum (design consultancy), Inelastic scattering, Atomic physics, Nuclear Experiment, Spectral line, Inelastic neutron scattering, Excitation
Abstract: Energy spectra of inelastic scattered π+ mesons from 16O, 40Ca, 60Ni, and 208Pb at Tπ = 50 MeV have been obtained at θlab = 40° and 80° for nuclear excitation energies up to ≈ 25 MeV. Differential cross section for the observed low-lying states and integrated continuum cross sections are given.
Published: 1977

40. Search for the substructure of leptons in high energy QED processes at tristan

Author: S. Trentalange, A. Bacala, Rr Mcneil, M. E. Mattson, M. Frautschi, W. Metcalf, S. Sakamoto, Yoshimasa Kurihara, Y. C. Zhu, Y. Ishi, H. Ichinose, S. L. Olsen, F. Kajino, Yasuo Higashi, Robert Stone, R. Chiba, E. H. Low, T. Thomas, S. K. Kim, A. Murakami, T. Mori, Tsunehiko Omori, E. H. Thorndike, C. A. Fry, R. Coombes, J. Lim, H. Itoh, S. Lusin, F. Sannes, R. L. Malchow, M. H. Lee, K. Gotow, P. N. Kirk, F. Naito, Kazumasa Miyano, K. Sparks, Yk Kim, Z. P. Mao, R. D. Kass, Hj Kim, J. Li, D. Blanis, Y. Yamashita, H. Miyata, H. Yokota, M. C.S. Williams, Sarah Catherine Eno, Susumu Terada, K. Eguchi, K. L. Sterner, J. Vinson, T. Takeda, K. Toyoshima, E. J. Kim, S. Matsumoto, Steve Schnetzer, D. Perticone, J. S. Kang, A. Maki, P. Perez, R. L. Imlay, S. Wilson, C. P. Cheng, C. Rosenfeld, Y. K. Li, Y. Sugimoto, H. Kozuka, K. Ueno, H. Harada, H. Kagan, Kiyosumi Tsuchiya, H. W. Zheng, A. T.M. Wang, R. Poling, Kazuo Abe, T. Nozaki, G. N. Kim, Kaori Maeshima, L. E. Piilonen, Hiroyuki Sagawa, Y. T. Xu, C. G. Trahern, T. Kumita, James C. Green, A. Sill, K. Ohta, Winston Ko, S. Kobayashi, I. H. Park, Y. H. Ho, N. M. Shaw, S. Igarashi, Dong-Chul Son, T. Ishizuka, R. L. Lander, Y. Takaiwa, H. S. Budd, S. S. Myung, R. Tanaka, A. Bodek, A. Abashian, Y. Sakai, T. Sasaki, Smith, and Y. Fujii
Subjects: Scattering cross-section, Physics, Nuclear and High Energy Physics, Particle physics, High energy, Muon, Electron–positron annihilation, High Energy Physics::Phenomenology, Electron, Nuclear physics, Excited state, Substructure, High Energy Physics::Experiment, Lepton
Abstract: QED processes up to O(α 4 ) have been studied at center-of-mass energies between 50 and 57 GeV using the AMY detector at TRISTAN. A possible substructure of the electron and muon is investigated in terms of chiral invariant contact interactions and also in terms of excited lepton production. The differential cross section data for e + e − →e + e − are consistent with the standard model at a confidence level of only 3.5%. From the absence of excited lepton production, we establish new upper limits on the coupling to excited electrons of mass up to 56 GeV/ c 2 and on the coupling to excited muons of mass up to 52 GeV/ c 2 .
Published: 1989

41. Measurements of the e+e− total hadronic cross section and a determination of M Λ

Author: C. Rosenfeld, S. S. Myung, S. Trentalange, T. Nozaki, P. Perez, A. Bodek, H. Kagan, Kiyosumi Tsuchiya, A. T.M. Wang, Tsunehiko Omori, J. R. Smith, R. Coombes, K. Eguchi, T. Takeda, Gui Nyun Kim, A. Maki, R. Tanaka, Steve Schnetzer, Kazuo Abe, Yusuke Higashi, H. Miyata, Hiroyuki Sagawa, Dong-Chul Son, K. Gotow, D. Perticone, Kaori Maeshima, A. Bacala, J. S. Kang, Robert Stone, H. S. Budd, E. H. Low, W. Metcalf, K. Ueno, S. Sakamoto, K. Miyano, C. A. Fry, M. H. Lee, H. Itoh, R. Imlay, A. Murakami, E. J. Kim, F. Sannes, J. Li, S. Matsumoto, D. Blanis, Y. Sugimoto, K. Toyoshima, Hyunyong Kim, I. H. Park, J. Vinson, C. P. Cheng, S. Lusin, A. Abashian, E. H. Thorndike, J. Lim, T. Ishizuka, K. L. Sterner, Z. P. Mao, M. Frautschi, R. Chiba, T. Thomas, Yoshimasa Kurihara, H. Kozuka, H. Yokota, S. Igarashi, H. Harada, Rr Mcneil, N. M. Shaw, H. W. Zheng, S. K. Kim, H. Ichinose, F. Kajino, Y. Takaiwa, Y. C. Zhu, S. L. Olsen, R. L. Lander, R. L. Malchow, Yongsun Kim, R. D. Kass, T. Mori, C. G. Trahern, T. Kumita, L. E. Piilonen, Y. T. Xu, A. Sill, Y. K. Li, K. Ohta, Y. Sakai, Winston Ko, R. Poling, S. Kobayashi, Y. H. Ho, T. Sasaki, S. Wilson, Y. Fujii, James C. Green, F. Naito, K. Sparks, M. C.S. Williams, Sarah Catherine Eno, Susumu Terada, P. N. Kirk, Y. Yamashita, M. E. Mattson, and Y. Ishi
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Standard Model, Nuclear physics, Cross section (physics), High Energy Physics::Experiment, Nuclear Experiment, Scale parameter, Boson
Abstract: The total cross section for e + e − annihilation into hadrons has been measured for CM energies ranging from 50 to 57 GeV. We fit the predictions of the standard model to these measurements and those at lower energies. The mass of the Z 0 boson, M Z , and the QCD scale parameter, Λ MS , are derived from the fit. The results are M Z =88.6 −1.8 +2.0 GeV/ c 2 , and Λ MS =0.15 −0.11 +0.16 GeV .
Published: 1989

42. The TRIUMF Time Projection Chamber Data Acquisition System

Author: G. Azuelos, W. R. Jack, M. S. Dixit, A. Bennett, H. Mes, C. K. Hargrove, T. Numao, C. Irwin, P. Schlatter, K. Gotow, I. Navon, M. Blecher, J. Spuller, A. Burnham, A.L. Carter, J. A. Macdonald, W. Dey, J. M. Poutissou, J.P. Martin, M. D. Hasinoff, R. Poutissou, M. Leitch, Douglas Bryman, and P. Depommier
Subjects: Physics, Nuclear and High Energy Physics, Time projection chamber, business.industry, Cyclotron, Process (computing), law.invention, Software, Data acquisition, Nuclear Energy and Engineering, law, Electronic engineering, Detectors and Experimental Techniques, Electrical and Electronic Engineering, DECnet, business, Computer hardware, Auxiliary memory, Computer Automated Measurement and Control
Abstract: The Time Projection Chamber (TPC) at TRIUMF was developed for the search for muon-electron conversion, a lepton number violating process. This paper describes the data acquisition system in use for the last two years. Basic components of the system are a multi-crate CAMAC acquisition system, external memory, PDP 11/40 and VAX 11/780 coupled through DECNET. A discussion of the various software packages for data-taking and on-line track reconstruction follows.
Published: 1983

43. The deuteron D-state and the π++d →p+p reaction

Author: T. Marks, J. Alster, M.J. Saltmarsh, K. Gabathuler, M. Blecher, E. E. Gross, R. L. Burman, R. D. Edge, B. Goplen, P.Y. Bertin, J.P. Perroud, W. R. Gibbs, C. W. Darden, C.A. Ludemann, K. Gotow, E.L. Lomon, R. P. Redwine, and B. M. Preedom
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, T matrix, Angular distribution, Deuterium, State (functional analysis), Atomic physics
Abstract: Angular distributions for the reaction π + + d → p + p at 40, 50, and 60 MeV are compared with calculations employing a π N t matrix both on and off-shell and two different models for the deuteron. Within this framework, the data require a 4% D-state admisture.
Published: 1976

44. Search for non-minimal Higgs production in e+e− annihilations at

Author: W. Metcalf, Yusuke Higashi, Robert Stone, M. C.S. Williams, E. H. Thorndike, R. Tanaka, T. Nozaki, E. H. Low, J. Lim, S. Lusin, A. Bacala, T. Thomas, A. Murakami, H. Miyata, Kazuo Abe, M. E. Mattson, F. Sannes, Hiroyuki Sagawa, Y. Ishi, K. P. Hu, P. Gu, Kaori Maeshima, Y. Yamagishi, P. N. Kirk, J. R. Smith, Hyunyong Kim, N. M. Shaw, Y. Yamashita, H. S. Budd, R. L. Malchow, Tsunehiko Omori, D. H. Han, Yongsun Kim, R. D. Kass, G. N. Kim, K. Gotow, David Stuart, Y. Takaiwa, Dong-Chul Son, A. Bodek, C. A. Fry, A. Abashian, C. Rosenfeld, E. J. Kim, H. Itoh, K. Toyoshima, A. Maki, Takashi Sasaki, Y. C. Zhu, S. L. Olsen, Yoshimasa Kurihara, R. Imlay, L. E. Piilonen, C. G. Trahern, M. H. Lee, T. Kumita, J. Li, A. T.M. Wang, S. Matsumoto, C. P. Cheng, R. C. Walker, Steve Schnetzer, Y. Sakai, A. Sill, S. S. Myung, H. W. Zheng, T. Mori, K. Ohta, Winston Ko, Y. Fujii, S. Kobayashi, Y. H. Ho, D. Blanis, K. L. Sterner, Rr Mcneil, S. K. Kim, F. Kajino, M. Frautschi, Y. T. Xu, H. Yokota, S. Wilson, Y. Sugimoto, T. Kojima, T. Yasuda, H. Kagan, Z. P. Mao, H. Harada, Richard Breedon, J. Vinson, R. L. Lander, P. Auchincloss, I. H. Park, T. Ishizuka, D. Perticone, J. S. Kang, K. Ueno, Kazumasa Miyano, K. Sparks, Sarah Catherine Eno, Susumu Terada, and R. Poling
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Higgs boson, Production (economics)
Published: 1989

45. Two-photon decays of pionic carbon

Author: G.T. Emery, W.C. Lam, P.L. Roberson, P.T. Debevec, K. Gotow, D. A. Jenkins, D.D. Long, and A.D. Bacher
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Photon, Pion, chemistry, Two-photon excitation microscopy, Angular correlation, Branching fraction, chemistry.chemical_element, Atomic physics, Nucleon, Carbon
Abstract: An experimental search was made for two-photon emission following π − capture on carbon. Using the photon angular correlation calculated for the dominant (π − p → γγn) mechanism, the upper limit on the branching ratio is found to be 1.4 × 10 −5 at a 90% confidence level. This result suggests that the virtual pion content of carbon is not significantly enhanced over the incoherent sum of the pion fields of individual nucleons.
Published: 1977

46. A large acceptance spectrometer

Author: P. Reeve and K. Gotow
Subjects: Physics, Nuclear physics, Magnetic measurements, Time projection chamber, Magnetic energy, Spectrometer, Electrical and Electronic Engineering, Atomic physics, Electronic, Optical and Magnetic Materials
Published: 1981

47. Measurements of cross sections and charge asymmetries for ee→ττ ee→μμ from 52 to 57 GeV

Author: E. H. Thorndike, T. Mori, R. Childers, Y. Sakai, Y. K. Li, W. Metcalf, S. Sakamoto, K. Hanaoka, C. W. Darden, T. Nozaki, R. Coombes, Z. P. Mao, A. Sill, H. Miyata, R. Poling, S. K. Kim, K. Ohta, Winston Ko, H. Kozuka, S. Trentalange, F. Sannes, Yoshimasa Kurihara, S. Kobayashi, M. H. Lee, Tsunehiko Omori, H. Harada, H. W. Zheng, Y. H. Ho, James C. Green, T. Sasaki, M. Frautschi, F. Naito, Kazumasa Miyano, K. Sparks, Hyunyong Kim, E. H. Low, A. Murakami, S. Matsumoto, R. Imlay, L. E. Piilonen, H. Asakura, K. Eguchi, T. Takeda, S. Wilson, J. Li, Y. Fujii, Steve Schnetzer, P. N. Kirk, Y. C. Zhu, Sarah Catherine Eno, C. G. Trahern, R. L. Lander, T. Kumita, Yusuke Higashi, Susumu Terada, H. Kagan, S. L. Olsen, C. A. Fry, Y. Sugimoto, A. Maki, S. Chakrabarti, H. Itoh, Y. Yamashita, R. Tanaka, H. Yokota, R. L. Malchow, Yongsun Kim, M. Ogawa, A. T.M. Wang, Rr Mcneil, R. D. Kass, N. M. Shaw, Y. Ishi, G. N. Kim, C. P. Cheng, S. Igarashi, Y. Yan, E. J. Kim, Y. T. Xu, M. C.S. Williams, P. Perez, F. Kajino, Dong-Chul Son, Y. Takaiwa, J. R. Smith, A. Bodek, Kiyosumi Tsuchiya, C. Rosenfeld, K. Gotow, D. Blanis, Kazuo Abe, D. Zimmerman, Kaori Maeshima, K. Toyoshima, H. Murata, S. Lusin, J. S. Kang, K. Ueno, I. H. Park, T. Ishizuka, S. S. Myung, A. Bacala, Robert Stone, A. Abashian, Hiroyuki Sagawa, H. S. Budd, and R. Chiba
Subjects: Physics, Coupling constant, Nuclear and High Energy Physics, Charge (physics), Atomic physics, Standard Model
Abstract: Measurements of the differential cross sections for e + e − →μ + μ − and e + e − →τ + τ − at values of s from 52 to 57 GeV are reported. The forward-backward asymmetries and the total cross sections for these reactions are found to be in agreement with predictions of the standard model of the electro-weak interactions. These measurements are used to extract values of the weak coupling constant g v e g v l and g A e g A l , where l = μ or τ .
Published: 1989

48. π+p scattering at 65 to 140 MeV

Author: H. Ziock, K. Gotow, W. J. Burger, G. Das, R. C. Minehart, B. G. Ritchie, B. M. Preedom, and R.S. Moore
Subjects: Elastic scattering, Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), Scattering, Partial wave analysis, Nuclear cross section, Scattering length, Atomic physics, Differential (mathematics)
Abstract: Differential cross sections for π+p elastic scattering were measured for seven incident energies from 65 to 140 MeV at laboratory scattering angles between 93° and 165°. The results are compared with previous results of Bertin et al. and the phase-shift analysis of Arndt and Roper. Agreement between the phase-shift analysis and the data is good.
Published: 1983

49. Observation of Large CP Violation in the Neutral B Meson System

Author: K, Abe, R, Abe, I, Adachi, B S, Ahn, H, Aihara, M, Akatsu, G, Alimonti, K, Asai, M, Asai, Y, Asano, T, Aso, V, Aulchenko, T, Aushev, A M, Bakich, E, Banas, S, Behari, P K, Behera, D, Beiline, A, Bondar, A, Bozek, T E, Browder, B C, Casey, P, Chang, Y, Chao, K F, Chen, B G, Cheon, R, Chistov, S K, Choi, Y, Choi, L Y, Dong, J, Dragic, A, Drutskoy, S, Eidelman, V, Eiges, Y, Enari, R, Enomoto, C W, Everton, F, Fang, H, Fujii, C, Fukunaga, M, Fukushima, N, Gabyshev, A, Garmash, T J, Gershon, A, Gordon, K, Gotow, H, Guler, R, Guo, J, Haba, H, Hamasaki, K, Hanagaki, F, Handa, K, Hara, T, Hara, N C, Hastings, H, Hayashii, M, Hazumi, E M, Heenan, Y, Higasino, I, Higuchi, T, Higuchi, T, Hirai, H, Hirano, T, Hojo, T, Hokuue, Y, Hoshi, K, Hoshina, S R, Hou, W S, Hou, S C, Hsu, H C, Huang, Y, Igarashi, T, Iijima, H, Ikeda, K, Ikeda, K, Inami, A, Ishikawa, H, Ishino, R, Itoh, G, Iwai, H, Iwasaki, Y, Iwasaki, D J, Jackson, P, Jalocha, H K, Jang, M, Jones, R, Kagan, H, Kakuno, J, Kaneko, J H, Kang, J S, Kang, P, Kapusta, N, Katayama, H, Kawai, Y, Kawakami, N, Kawamura, T, Kawasaki, H, Kichimi, D W, Kim, H, Kim, H J, Kim, S K, Kim, T H, Kim, K, Kinoshita, S, Kobayashi, S, Koishi, H, Konishi, K, Korotushenko, P, Krokovny, R, Kulasiri, S, Kumar, T, Kuniya, E, Kurihara, A, Kuzmin, Y J, Kwon, J S, Lange, G, Leder, M H, Lee, S H, Lee, C, Leonidopoulos, Y S, Lin, D, Liventsev, R S, Lu, J, MacNaughton, D, Marlow, T, Matsubara, S, Matsui, S, Matsumoto, T, Matsumoto, Y, Mikami, K, Misono, K, Miyabayashi, H, Miyake, H, Miyata, L C, Moffitt, G R, Moloney, G F, Moorhead, S, Mori, T, Mori, A, Murakami, T, Nagamine, Y, Nagasaka, Y, Nagashima, T, Nakadaira, T, Nakamura, E, Nakano, M, Nakao, H, Nakazawa, J W, Nam, Z, Natkaniec, K, Neichi, S, Nishida, O, Nitoh, S, Noguchi, T, Nozaki, S, Ogawa, T, Ohshima, Y, Ohshima, T, Okabe, T, Okazaki, S, Okuno, S L, Olsen, H, Ozaki, P, Pakhlov, H, Palka, C S, Park, C W, Park, H, Park, L S, Peak, M, Peters, L E, Piilonen, E, Prebys, J L, Rodriguez, N, Root, M, Rozanska, K, Rybicki, J, Ryuko, H, Sagawa, Y, Sakai, H, Sakamoto, M, Satapathy, A, Satpathy, S, Schrenk, S, Semenov, K, Senyo, Y, Settai, M E, Sevior, H, Shibuya, B, Shwartz, A, Sidorov, S, Stanic, A, Sugi, A, Sugiyama, K, Sumisawa, T, Sumiyoshi, J, Suzuki, K, Suzuki, S, Suzuki, S Y, Suzuki, S K, Swain, H, Tajima, T, Takahashi, F, Takasaki, M, Takita, K, Tamai, N, Tamura, J, Tanaka, M, Tanaka, G N, Taylor, Y, Teramoto, M, Tomoto, T, Tomura, S N, Tovey, K, Trabelsi, T, Tsuboyama, T, Tsukamoto, S, Uehara, K, Ueno, Y, Unno, S, Uno, Y, Ushiroda, S E, Vahsen, K E, Varvell, C C, Wang, C H, Wang, J G, Wang, M Z, Wang, Y, Watanabe, E, Won, B D, Yabsley, Y, Yamada, M, Yamaga, A, Yamaguchi, H, Yamamoto, T, Yamanaka, Y, Yamashita, M, Yamauchi, S, Yanaka, J, Yashima, M, Yokoyama, K, Yoshida, Y, Yusa, H, Yuta, C C, Zhang, J, Zhang, H W, Zhao, Y, Zheng, V, Zhilich, and D, Zontar
Subjects: Tamura, Norio, 田村, 詔生
Abstract: We present a measurement of the standard model CP violation parameter sin2 phi(1) based on a 29.1 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. One neutral B meson is fully reconstructed as a J/psi K(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psi K(L), or J/psi K(*0) decay and the flavor of the accompanying B meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two B meson decay points, we determine sin2 phi(1) = 0.99+/-0.14(stat)+/-0.06(syst). We conclude that we have observed CP violation in the neutral B meson system.

50. Reduced Energy Spread of Synchro‐cyclotron Beams

Author: K. F. Kinsey, E. H. Thorndike, F. Lobkowicz, K. Gotow, N. W. Reay, and M. E. Nordberg
Subjects: Physics, Synchro, Optics, business.industry, law, Cyclotron, business, Instrumentation, Energy (signal processing), law.invention, Radio wave
Published: 1964

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