Author: "K. Gotow" / Topic: particle physics - Searchworks@Jio Institute Digital Library Search Results

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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. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. Study of two particle azimuthal correlations ine+e−annihilation at √s=58 GeV

Author: S. Wilson, L. E. Piilonen, Saroj Kumar Sahu, J. Rowe, A. Bodek, C. Rosenfeld, M. E. Mattson, S. Behari, J. S. Kang, Dong-Chul Son, N. Takashimizu, S. K. Choi, K. Ohkubo, Tsunehiko Omori, D. Haim, L. M. Chinitz, K. W. Park, T. Nozaki, Hiroyuki Sagawa, S. Kobayashi, P. N. Kirk, S. Ebara, Moo Hyun Lee, M. Oyoshi, D. Y. Kim, Bj Kim, S. Lusin, Stephen L. Olsen, Y. Yamashita, T. Kumita, Yoshimasa Kurihara, H. Miyata, Takashi Sasaki, R. L. Lander, Y. Sakai, C. P. Cheng, C. A. Fry, Winston Ko, C. Velissaris, D. K. Cho, Yasuhiro Sugimoto, Ryuki Tanaka, Y. Takaiwa, T. Ishizuka, Y. S. Chung, M. H. Ye, F. Liu, A. Abashian, S. K. Kim, F. Kajino, Kazumasa Miyano, Susumu Terada, K. Gotow, Y. Fujii, S. S. Myung, A. Murakami, K. B. Lee, Richard Breedon, T. Aso, S. Kanda, K. Ueno, J. Vinson, J. R. Smith, K. L. Sterner, David Stuart, R. C. Walker, Steve Schnetzer, A. Maki, L. Y. Zheng, Kazuo Abe, M. Shirai, and S. Matsumoto
Subjects: Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Perturbative QCD, Parton, Hadronization, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Event (particle physics)
Abstract: We have measured the azimuthal correlation of hadrons produced in e(+)e(-) annihilations at root s=58 GeV. In perturbative QCD these correlations are sensitive to the interference between soft gluons emitted at large angles with respect to the event axis. However, Monte Carlo calculations incorporating QCD-inspired hadronization models in which the correlation of interjet particles is treated in a phenomenological manner describe the data well. We also observe that angular ordering of the parton showering in the LUND Monte Carlo program improves the agreement with the data.
Published: 1995

13. 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

14. 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

15. 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

16. Measurements of cross section and asymmetry fore+e−→bb¯and heavy quark fragmentation at KEK TRISTAN

Author: S. K. Choi, A. Maki, L. Y. Zheng, Hiroyuki Sagawa, M. Oyoshi, Yasuhiro Sugimoto, Y. S. Chung, H. Miyata, R. L. Lander, Y. Sakai, Robert Stone, L. M. Chinitz, S. S. Myung, Bj Kim, S. Kanda, C. Velisarris, M. Shirai, Winston Ko, W. X. Gao, M. H. Ye, Kazuo Abe, J. R. Smith, F. Liu, C. P. Cheng, W. G. Yan, A. Murakami, K. Gotow, Y. Fujii, C. A. Fry, K. W. Park, Stephen L. Olsen, T. Thomas, J. Rowe, A. Bodek, R. Poling, M. E. Mattson, D. K. Cho, Yoshimasa Kurihara, L. E. Piilonen, T. Aso, M. E. Zomorrodian, David Stuart, Dong-Chul Son, K. L. Sterner, M. H. Lee, Kazumasa Miyano, K. Okubo, C. Rosenfeld, P. N. Kirk, S. Matsumoto, Y. Yamashita, Susumu Terada, Ryuki Tanaka, Y. Takaiwa, S. Wilson, Tsunehiko Omori, T. Nozaki, D. Y. Kim, R. C. Walker, A. Abashian, Steve Schnetzer, S. K. Kim, Saroj Kumar Sahu, N. Takashimizu, Takashi Sasaki, F. Kajino, K. B. Lee, Richard Breedon, K. Ueno, J. Vinson, T. Kumita, F. Sannes, Y. K. Li, S. Lusin, J. S. Kang, S. Kobayashi, S. Ebara, and T. Ishizuka
Subjects: Quark, Nuclear physics, Physics, Particle physics, Annihilation, Muon, Meson, Electron–positron annihilation, Hadron, Bottom quark, Charm quark
Abstract: Using 773 muons found in hadronic events from 142 pb-1 of data at a c.m. energy of 57.8 GeV, we extract the cross section and forward-backward charge asymmetry for the e+e- --> bbBAR process, and the heavy quark fragmentation function parameters for the Peterson model. For the analysis of the e+e- --> bbBAR process, we use a method in which the behavior of the c quark and lighter quarks is assumed, with only that of the b quark left indeterminate. The cross section and asymmetry for e+e- --> bbBAR are found to be R(b) = 0.57 +/- 0.06(stat) +/- 0.08(syst) and A(b) = -0.59 +/- 0.09 +/- 0.09, respectively. They are consistent with the standard model predictions. For the study of the fragmentation function we use the variable [x(e)], the fraction of the beam energy carried by the heavy hadrons. We obtain [x(E)]c = 0.56(-0.05-0.03)+0.04+0.03 and [x(E)]b = 0.65(-0.04-0.06)+0.06+0.05, respectively. These are in good agreement with previously measured values.
Published: 1994

17. Forward-backward charge asymmetry of quark pairs produced at the KEK TRISTANe+e−collider

Author: K. Gotow, Y. Fujii, Stephen L. Olsen, S. S. Myung, Richard Breedon, J. S. Kang, K. L. Sterner, T. Aso, L. E. Piilonen, Yoshimasa Kurihara, K. Ueno, M. E. Mattson, F. Kajino, M. H. Lee, A. T.M. Wang, J. Vinson, S. Ebara, S. Kanda, S. Wilson, Robert Stone, D. Stuart, Kisoo Lee, C. A. Fry, P. N. Kirk, S. Kobayashi, K. W. Park, C. Velisarris, Sunghee Kim, W. X. Gao, C. Rosenfeld, T. Kumita, Y. Yamashita, C. P. Cheng, Ron Poling, Yasuhiro Sugimoto, T. Ishizuka, Winston Ko, S. K. Choi, F. Sannes, Dong-Chul Son, Hiroyuki Sagawa, T. Thomas, S. Lusin, Bj Kim, D. Haim, Y. S. Chung, J. R. Smith, Takashi Sasaki, M. Oyoshi, J. Rowe, A. Abashian, R. L. Lander, W. G. Yan, A. Maki, A. Bodek, Y. K. Li, L. Y. Zheng, Kazuo Abe, N. Morgan, Saroj Kumar Sahu, L. M. Chinitz, R. C. Walker, Steve Schnetzer, N. Takashimizu, M. H. Ye, F. Liu, Tsunehiko Omori, T. Nozaki, S. Matsumoto, H. Miyata, Y. Sakai, Kazumasa Miyano, Susumu Terada, A. Murakami, Ryuki Tanaka, and Y. Takaiwa
Subjects: Physics, Quark, Particle physics, High Energy Physics::Lattice, Electron–positron annihilation, media_common.quotation_subject, High Energy Physics::Phenomenology, Charge (physics), Jet (particle physics), Asymmetry, law.invention, Standard Model, Nuclear physics, Pair production, law, High Energy Physics::Experiment, Collider, media_common
Abstract: We report on a measurement of the forward-backward charge asymmetry in e+e- --> qqBAR at KEK TRISTAN, where. the asymmetry is near maximum. We sum over all flavors and measure the asymmetry by determining the charge of the quark jets. In addition we exploit flavor dependencies in the jet charge determination to enhance the contributions of certain flavors. This provides a check on the asymmetries of individual flavors. The measurement agrees with the standard model expectations.
Published: 1994

18. 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

19. 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

20. 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

21. 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

22. SEARCH FOR CHARGED HEAVY LEPTONS WITH ARBITRARY NEUTRINO MASSES IN e+e− ANNIHILATIONS AT $\sqrt{s} = 50 - 60.8~{\rm GeV}$

Author: Richard Breedon, M. H. Ye, Hiroyuki Sagawa, H. Miyata, J. Vinson, S. Lusin, W. Metcalf, K. Gotow, C. G. Trahern, T. Kumita, David Stuart, Takashi Sasaki, H. S. Budd, Kazuo Abe, C. Rosenfeld, Y. C. Zhu, S. L. Olsen, A. Sill, D. Perticone, F. Sannes, Y. Fujii, J. S. Kang, Y. Sugimoto, T. Mori, R. R. McNeil, Kaori Maeshima, K. Ohta, K. P. Hu, Winston Ko, K. Ueno, F. Kajino, Yasuo Higashi, M. H. Lee, R. Tanaka, E. J. Kim, E. H. Thorndike, J. Lim, G. N. Kim, S. Kobayashi, Robert Stone, J. Li, D. Blanis, Y. Sakai, Y. H. Ho, S.K. Kim, N. M. Shaw, Tsunehiko Omori, P. Gu, I. H. Park, S. Matsumoto, J. Liu, T. Nozaki, R. L. Malchow, P. Auchincloss, K. L. Sterner, Bj Kim, R. L. Imlay, D. H. Han, Yongsun Kim, J. Rowe, T. Ishizuka, R. D. Kass, K. Tomioka, A. Maki, C. P. Cheng, A. Bodek, C. A. Fry, S. S. Myung, H. W. Zheng, R. C. Walker, A. Bacala, Steve Schnetzer, H. Harada, Y. Takaiwa, Dong-Chul Son, H. Kagan, C. Velissaris, M. E. Mattson, A. Abashian, Y. Ishi, Yoshimasa Kurihara, E. H. Low, S. Wilson, P. N. Kirk, R. L. Lander, Y. Yamashita, Y. K. Li, A. Murakami, M. Frautschi, R. Poling, Kazumasa Miyano, Sarah Catherine Eno, Susumu Terada, T. Thomas, A. T.M. Wang, J. R. Smith, Hyunyong Kim, and L. E. Piilonen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Hadron, Astronomy and Astrophysics, Atomic and Molecular Physics, and Optics, Massless particle, Nuclear physics, Pair production, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Lepton
Abstract: Results of a search for the pair production of charged heavy leptons in e+e− annihilations over the center-of-mass energy range of 50 to 60.8 GeV are reported. We assume that the leptons are of the sequential type but have allowed for the case where the associated neutrino might be massive. Separate searches for evidence for decays to hadronic and leptonic final states, searches specialized for the case where the charged lepton and its associated neutrino are close in mass, and a search for stable heavy leptons have uncovered no evidence for the production of such particles at these energies. Mass limits for heavy leptons and their associated neutrinos are determined for a range of hadronic and leptonic decay branching fractions. A sequential charged heavy lepton with mass between 12.6 and 29.6 GeV/c2 and with massless neutrino is excluded at the 95% confidence level.
Published: 1991

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. Measurements ofRfore+e−annihilation at the KEK collider TRISTAN

Author: M. Frautschi, Y. Sakai, M. H. Ye, Y. Fujii, Hiroyuki Sagawa, Y. K. Li, D. H. Han, E. H. Thorndike, T. Mori, D. Perticone, J. Lim, R. Poling, Y. Sugimoto, J. Li, A. Bacala, Yoshimasa Kurihara, W. Metcalf, Robert Stone, Rr Mcneil, T. Nozaki, J. S. Kang, L. E. Piilonen, E. H. Low, E. J. Kim, C. G. Trahern, A. Murakami, H. S. Budd, Takashi Sasaki, T. Kumita, S. K. Kim, R. C. Walker, Steve Schnetzer, K. Ueno, A. Abashian, F. Sannes, Kazuo Abe, G. N. Kim, Kaori Maeshima, K. P. Hu, C. P. Cheng, Y. Yamagishi, R. L. Malchow, F. Kajino, R. Tanaka, C. A. Fry, Yongsun Kim, P. Gu, R. L. Lander, T. Kojima, A. Sill, H. Kagan, R. Imlay, R. D. Kass, M. H. Lee, T. Yasuda, K. Ohta, Winston Ko, N. M. Shaw, A. Maki, Richard Breedon, K. Gotow, Kazumasa Miyano, S. Kobayashi, David Stuart, S. Lusin, S. Matsumoto, Y. H. Ho, D. Blanis, S. Wilson, Y. Takaiwa, J. Vinson, A. Bodek, Hyunyong Kim, Dong-Chul Son, Sarah Catherine Eno, I. H. Park, Susumu Terada, J. Liu, Yusuke Higashi, Y. C. Zhu, K. L. Sterner, H. Harada, S. L. Olsen, T. Ishizuka, P. Auchincloss, S. S. Myung, H. W. Zheng, T. Thomas, M. E. Mattson, Y. Ishi, P. N. Kirk, Y. Yamashita, A. T.M. Wang, J. R. Smith, Tsunehiko Omori, C. Rosenfeld, and H. Miyata
Subjects: Nuclear physics, Physics, Particle physics, Antiparticle, Muon, Annihilation, Pair production, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Antimatter, Electron–positron annihilation, Hadron, Elementary particle
Abstract: The ratio {ital R} of the total cross section for {ital e}{sup +}{ital e}{sup {minus}} annihilation into hadrons to the lowest-order QED cross section for {ital e}{sup +}{ital e}{sup {minus}}{r arrow}{mu}{sup +}{mu}{sup {minus}} has been measured for center-of-mass energies ranging from 50 to 61.4 GeV. If we allow for an overall shift of {minus}4.9%, about 1.5 times our estimated normalization error, the results are consistent with the standard-model predictions.
Published: 1990

25. 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

26. Multihadron-event properties ine+e−annihilation ats=52−57GeV

Author: R. Tanaka, M. Frautschi, H. Miyata, A. Abashian, Takashi Sasaki, J. Li, M. H. Lee, L. E. Piilonen, Y. Sakai, W. Metcalf, H. Kagan, N. M. Shaw, T. Mori, I. H. Park, R. R. McNeil, P. Auchincloss, J. Liu, S. Wilson, R. L. Imlay, T. Ishizuka, S. Lusin, D. Perticone, Hiroyuki Sagawa, C. A. Fry, S. Matsumoto, Kazumasa Miyano, J. S. Kang, A. Bodek, T. Kojima, C. P. Cheng, T. Yasuda, Y. Takaiwa, K. Ueno, E. H. Low, Yasuhiro Sugimoto, Tsunehiko Omori, R. C. Walker, S. Kobayashi, F. Sannes, A. Maki, K. Gotow, Y. Fujii, Steve Schnetzer, C. G. Trahern, Dong-Chul Son, Kazuo Abe, T. Kumita, Robert Stone, T. Nozaki, K. P. Hu, Hyunyong Kim, Richard Breedon, H. S. Budd, G. N. Kim, S. S. Myung, H. W. Zheng, Sarah Catherine Eno, Susumu Terada, R. L. Lander, Kaori Maeshima, J. Vinson, E. J. Kim, Y. Yamagishi, M. H. Ye, H. Harada, Yoshimasa Kurihara, J. R. Smith, T. Thomas, D. H. Han, Yusuke Higashi, Y. K. Li, A. Murakami, R. Poling, M. E. Mattson, A. Sill, A. T.M. Wang, K. Ohta, Winston Ko, Y. Ishi, P. N. Kirk, Y. H. Ho, Y. Yamashita, D. Blanis, A. Bacala, K. L. Sterner, S. K. Kim, R. L. Malchow, F. Kajino, Yongsun Kim, R. D. Kass, E. H. Thorndike, J. Lim, P. Gu, David Stuart, Y. C. Zhu, S. L. Olsen, and C. Rosenfeld
Subjects: Quantum chromodynamics, Astroparticle physics, Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Parton, Elementary particle, Quantum field theory, Nuclear Experiment, Hadronization
Abstract: We present the general properties of multihadron final states produced by {ital e}{sup +}{ital e}{sup {minus}} annihilation at center-of-mass energies from 52 to 57 GeV in the AMY detector at the KEK collider TRISTAN. Global shape, inclusive charged-particle, and particle-flow distributions are presented. Our measurements are compared with QCD+fragmentation models that use either leading-logarithmic parton-shower evolution or QCD matrix elements at the parton level, and either string or cluster fragmentation for hadronization.
Published: 1990

27. 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

28. Forward-backward charge asymmetry ine+e−→hadron jets

Author: D. Stuart, R. E. Breedon, G. N. Kim, Winston Ko, R. L. Lander, K. Maeshima, R. L. Malchow, J. R. Smith, R. Imlay, P. Kirk, J. Lim, R. R. McNeil, W. Metcalf, S. S. Myung, C. P. Cheng, P. Gu, J. Li, Y. K. Li, M. H. Ye, Y. C. Zhu, A. Abashian, K. Gotow, K. P. Hu, E. H. Low, M. E. Mattson, L. Piilonen, K. L. Sterner, S. Lusin, C. Rosenfeld, A. T. M. Wang, S. Wilson, M. Frautschi, H. Kagan, R. Kass, C. G. Trahern, K. Abe, Y. Fujii, Y. Higashi, S. K. Kim, Y. Kurihara, A. Maki, T. Nozaki, T. Omori, H. Sagawa, Y. Sakai, Y. Sugimoto, Y. Takaiwa, S. Terada, R. Walker, F. Kajino, D. Perticone, R. Poling, T. Thomas, Y. Ishi, K. Miyano, H. Miyata, T. Sasaki, Y. Yamashita, A. Bacala, J. Liu, I. H. Park, F. Sannes, S. Schnetzer, R. Stone, J. Vinson, P. Auchincloss, D. Blanis, A. Bodek, H. Budd, S. Eno, C. A. Fry, H. Harada, Y. H. Ho, Y. K. Kim, T. Kumita, T. Mori, S. L. Olsen, N. M. Shaw, A. Sill, E. H. Thorndike, K. Ueno, H. W. Zheng, S. Kobayashi, A. Murakami, J. S. Kang, H. J. Kim, M. H. Lee, D. H. Han, E. J. Kim, D. Son, T. Kojima, S. Matsumoto, R. Tanaka, Y. Yamagishi, T. Yasuda, T. Ishizuka, and K. Ohta (The AMY Collaboration)
Subjects: Quark, Physics, Particle physics, Annihilation, High Energy Physics::Lattice, Computer Science::Information Retrieval, media_common.quotation_subject, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Charge (physics), Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, Production (computer science), media_common
Abstract: The forward-backward asymmetry of quarks produced in {ital e}{sup +}{ital e}{sup {minus}} annihilations, summed over all flavors, is measured at {radical}{ital s} between 50 and 60.8 GeV. Methods of determining the charge direction of jet pairs are discussed. The asymmetry is found to agree with the five-flavor standard model.
Published: 1990

29. 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

30. 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

31. 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

32. 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

33. Observation ofB±→pp¯K±

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, B. G. Cheon, R. Chistov, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, 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, 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. Inami, A. Ishikawa, H. Ishino, R. Itoh, H. Iwasaki, Y. Iwasaki, D. J. Jackson, H. K. Jang, R. Kagan, 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, 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, D. Marlow, T. Matsubara, 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, 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, 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, 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, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yuan, Y. Yusa, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, Meson, Branching fraction, Hadron, Analytical chemistry, Resonance, General Physics and Astronomy, Particle decay, KEKB, High Energy Physics::Experiment, B meson, Nucleon, Bar (unit)
Abstract: We report the observation of the decay mode $B^{\pm}\to p \bar{p} K^{\pm}$ based on an analysis of 29.4 fb$^{-1}$ of data collected by the Belle detector at KEKB. This is the first example of a $b\to s$ transition with baryons in the final state. The $p \bar{p}$ mass spectrum in this decay is inconsistent with phase space and is peaked at low mass. The branching fraction for this decay is measured to be ${\cal B}(B^{\pm}\to p \bar{p} K^{\pm}) =(4.3^{+1.1}_{-0.9}({\rm stat})\pm 0.5({\rm syst}))\times 10^{-6}.$ We also report upper limits for the decays $B^0\to p \bar{p} K_S$ and $B^{\pm}\to p \bar{p} \pi^{\pm}$.
Published: 2002

34. 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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35. 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

36. 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

37. 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

38. 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

39. Mass limits of charged Higgs boson at largetanβfrome+e−annihilations ats=50−60.8GeV

Author: D. H. Han, A. Sill, K. Ohta, Winston Ko, Y. H. Ho, Robert Stone, Hiroyuki Sagawa, A. Bacala, N. M. Shaw, Dong-Chul Son, C. G. Trahern, T. Kumita, David Stuart, Yusuke Higashi, Y. K. Li, A. Murakami, R. L. Malchow, Y. Takaiwa, H. S. Budd, Yasuhiro Sugimoto, R. C. Walker, Yongsun Kim, R. Poling, Bj Kim, J. Li, P. N. Kirk, T. Kojima, Takashi Sasaki, Y. C. Zhu, R. D. Kass, Steve Schnetzer, S. L. Olsen, T. Yasuda, H. Kagan, R. L. Imlay, Y. Yamashita, Yoshimasa Kurihara, K. Gotow, Y. Fujii, C. P. Cheng, E. H. Thorndike, E. H. Low, J. Lim, M. E. Mattson, Kazumasa Miyano, M. Frautschi, A. Maki, S. Wilson, T. Mori, Kazuo Abe, Y. Ishi, P. Gu, T. Nozaki, Sarah Catherine Eno, Susumu Terada, P. Auchincloss, A. T.M. Wang, E. J. Kim, Kaori Maeshima, Y. Yamagishi, M. H. Ye, M. H. Lee, J. R. Smith, W. Metcalf, S. Matsumoto, F. Sannes, S. S. Myung, H. W. Zheng, R. L. Lander, K. P. Hu, Richard Breedon, J. Vinson, H. Harada, S. K. Kim, J. Rowe, A. Bodek, F. Kajino, C. Velissaris, C. Rosenfeld, R. Tanaka, G. N. Kim, S. Lusin, D. Blanis, I. H. Park, J. Liu, T. Ishizuka, K. L. Sterner, D. Perticone, J. S. Kang, R. R. McNeil, K. Ueno, S. Kobayashi, C. A. Fry, Hyunyong Kim, T. Thomas, A. Abashian, H. Miyata, Y. Sakai, Tsunehiko Omori, and L. E. Piilonen
Subjects: Physics, Antiparticle, Particle decay, Particle physics, Pair production, Computer Science::Information Retrieval, Antimatter, High Energy Physics::Phenomenology, Higgs boson, High Energy Physics::Experiment, Elementary particle, Lepton, Higgs sector
Abstract: A search for the pair production of charged Higgs particles decaying via the {ital H}{sup {minus}}{r arrow}{tau}{bar {nu}} mode has been made in {ital e}{sup +}{ital e}{sup {minus}} annihilations at center-of-mass energies between 50 and 60.8 GeV using the AMY detector at the KEK collider TRISTAN. No evidence for their existence is observed and 95%-C.L. mass limits are presented. The result has been interpreted in terms of the tan{beta} parameter in the Higgs sector.
Published: 1990

40. 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

41. 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

42. Measurement of e^{+}e^{-}→bb¯ forward-backward charge asymmetry between √s =52 and 57 GeV

Author: C. Rosenfeld, Yasuhiro Sugimoto, Z. P. Mao, M. H. Lee, Takashi Sasaki, S. Wilson, David Stuart, A. Bacala, D. H. Han, G. N. Kim, Robert Stone, H. Harada, K. Gotow, Y. Fujii, S. Matsumoto, D. Blanis, A. Bodek, L. E. Piilonen, J. Li, Y. C. Zhu, S. L. Olsen, H. Kozuka, J. Vinson, K. Toyoshima, P. Perez, H. Kagan, H. W. Zheng, Y. T. Xu, N. M. Shaw, Steve Schnetzer, T. Nozaki, Y. Ishi, Y. K. Li, A. Murakami, R. L. Imlay, E. H. Thorndike, J. Lim, M. E. Mattson, S. S. Myung, Kazuo Abe, K. Ueno, R. Poling, C. P. Cheng, E. J. Kim, P. N. Kirk, P. Gu, K. Ohta, Winston Ko, Dong-Chul Son, Ryuki Tanaka, Kaori Maeshima, Y. Takaiwa, K. L. Sterner, Kazumasa Miyano, K. Sparks, Y. H. Ho, Y. Yamashita, R. L. Malchow, Yongsun Kim, R. D. Kass, Sarah Catherine Eno, Susumu Terada, Yoshimasa Kurihara, Hiroyuki Sagawa, A. Maki, E. H. Low, Alan Sill, H. S. Budd, T. L.T. Thomas, Yusuke Higashi, R. L. Lander, M. Frautschi, Hyunyong Kim, J. R. Smith, A. Abashian, M. C.S. Williams, R. R. McNeil, S. K. Kim, H. Ichinose, F. Kajino, A. T.M. Wang, C. A. Fry, H. Itoh, J. S. Kang, Hideo Yokota, S. Kobayashi, I. H. Park, T. Ishizuka, H. Miyata, Y. Sakai, S. Lusin, D. Perticone, Tsunehiko Omori, T. Mori, C. G. Trahern, T. Kumita, T. Takeda, W. Metcalf, F. Sannes, and K. P. Hu
Subjects: Physics, Particle physics, Annihilation, Pair production, Electron–positron annihilation, Hadron, General Physics and Astronomy, Production (computer science), Charge (physics), Bottom quark, Energy (signal processing)
Abstract: Using 123 multihadronic inclusive muon-production ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilation events at an average c.m. energy of 55.2 GeV, we extracted the forward-backward charge asymmetry of the ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$\ensuremath{\rightarrow}bb\ifmmode\bar\else\textasciimacron\fi{} process and the R ratio for bb\ifmmode\bar\else\textasciimacron\fi{} production. We used an analysis method in which the behavior of the c quark and lighter quarks is assumed, with only that of the b quark left indeterminate. The results, ${A}_{b}$=-0.72\ifmmode\pm\else\textpm\fi{}0.28(stat)\ifmmode\pm\else\textpm\fi{}0.13(syst) and ${R}_{b}$=0.57\ifmmode\pm\else\textpm\fi{}0.16\ifmmode\pm\else\textpm\fi{}0.10, are consistent with the standard model.
Published: 1989

43. 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

44. Search for Isolated Leptons in Low-Thruste+e−Annihilation Events ats=50 and 52GeV

Author: M. Frautschi, K. Eguchi, S. Lusin, W. Metcalf, M. Ogawa, I. H. Park, S. Ishimoto, K. Gotow, S. S. Myung, S. Sakamoto, S. Trentalange, Yusuke Higashi, A. Aldritch, M. Miyashita, Z. P. Mao, K. Toyoshima, H. Murata, S. K. Kim, H. Yokota, H. S. Zhou, T. Ishizuka, P. Perez, F. Sannes, H. Harada, Y. T. Xu, N. M. Shaw, Yasuhiro Sugimoto, J. S. Kang, E. H. Thorndike, R. Chiba, M. H. Lee, Hyunyong Kim, A. Murakami, K. Hanaoka, K. Ueno, H. Kagan, Kiyosumi Tsuchiya, R. Poling, A. Bodek, S. Kobayashi, Ryuki Tanaka, C. G. Trahern, T. Kumita, R. Coombes, S. Igarashi, Y. Yan, S. Matsumoto, Hiroyuki Sagawa, Tsunehiko Omori, James C. Green, F. Naito, Kazumasa Miyano, F. Kajino, T. Takeda, Y. Takaiwa, K. Sparks, R. Childers, M. C.S. Williams, D. Zimmerman, C. W. Darden, A. Maki, Y. Sakai, Sarah Catherine Eno, Susumu Terada, C. Rosenfeld, H. Asakura, D. Blanis, Takashi Sasaki, Steve Schnetzer, G. N. Kim, T. Mori, H. Miyata, Kazuo Abe, H. S. Budd, D. R. Johnson, P. N. Kirk, S. Wilson, J. Edwards, R. R. McNeil, A. Sill, Kaori Maeshima, Y. Yamashita, K. Ohta, Winston Ko, Y. Fujii, Yoshimasa Kurihara, A. Abashian, C. A. Fry, S. Chakrabarti, T. Maruta, R. L. Lander, Y. H. Ho, H. Itoh, T. Nozaki, Y. Ishi, E. J. Kim, Y. C. Zhu, S. L. Olsen, A. Bacala, Robert Stone, R. L. Imlay, C. P. Cheng, Dong-Chul Son, H. Kozuka, H. W. Zheng, Hoyun Lee, R. L. Malchow, Yongsun Kim, and R. D. Kass
Subjects: Physics, Quark, Particle physics, Annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, Thrust, Elementary particle, Fermion, Standard Model, Nuclear physics, Square root, High Energy Physics::Experiment, Lepton
Abstract: Multihadronic e/sup +/e/sup -/ annihilation events containing final-state leptons have been investigated with a 4.7-pb/sup -1/ data sample at c.m. energies of 50 and 52 GeV. The number of low-thrust events (Tless than or equal to0.8) with isolated leptons is consistent with the expectation of the standard model with five quark flavors. Limits on the production of new quarks and leptons are reported.
Published: 1988

45. Measurements ofRand a Search for Heavy-Quark Production ine+e−Annihilation ats=50 and 52GeV

Author: T. Mori, K. Eguchi, R. Coombes, D. R. Johnson, Yusuke Higashi, F. T. Avignone, A. Sill, S. Igarashi, H. Itoh, E. H. Thorndike, M. Frautschi, K. Ohta, A. Bacala, Winston Ko, M. Miyashita, A. Maki, K. Hanaoka, D. Zimmerman, Robert Stone, S. S. Myung, S. Ishimoto, T. Nozaki, Rr Mcneil, C. G. Trahern, K. Gotow, S. Kobayashi, T. Maruta, Y. Sakai, Y. H. Ho, P. Perez, T. Kumita, Hyunyong Kim, T. Sasaki, C. P. Cheng, H. Yokota, H. Miyata, James C. Green, J. Edwards, Y. Yan, Ron Poling, F. Naito, J. S. Kang, Kiyosumi Tsuchiya, R. Imlay, D. Saroff, K. Sparks, F. Kajino, K. Toyoshima, S. Matsumoto, Z. P. Mao, Kazuo Abe, Dong-Chul Son, H. Murata, Hiroyuki Sagawa, Yoshimasa Kurihara, A. Abashian, Y. Fujii, K. Ueno, R. Childers, Y. C. Zhu, H. Harada, C. A. Fry, D. Blanis, S. Lusin, Sarah Catherine Eno, Kaori Maeshima, S. L. Olsen, Susumu Terada, Y. Sugimoto, H. S. Budd, M. Ogawa, C. Darden, A. Aldritch, K. Miyano, R. Chiba, R. L. Lander, G. N. Kim, H. Kagan, N. M. Shaw, S. Trentalange, M. C.S. Williams, C. Rosenfeld, I. H. Park, Steve Schnetzer, Tsunehiko Omori, H. S. Zhou, T. Ishizuka, Y. Takaiwa, A. Murakami, P. N. Kirk, Y. Yamashita, H. Kozuka, R. L. Malchow, Yongsun Kim, R. D. Kass, H. W. Zheng, H. Otsuki, Hoyun Lee, P. Mani, A. Bodek, H. Asakura, R. Tanaka, W. Metcalf, S. Sakamoto, S. K. Kim, F. Sannes, S. Wilson, T. Takeda, Y. Ishi, Y. T. Xu, E. J. Kim, W. Marterer, and S. Chakrabarti
Subjects: Elastic scattering, Physics, Quark, Nuclear physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, General Physics and Astronomy, Parton, Elementary particle, Bhabha scattering
Abstract: The R ratio for e/sup +/e/sup -/ annihilation into hadronic final states is measured to be 4.34 +- 0.45 +- 0.30 and 4.23 +- 0.20 +- 0.21 at c.m. energies of 50 and 52 GeV, respectively. From these values of R and an analysis of the event shapes we deduce a 95%-confidence-level upper limit for the production rate of new heavy charge +(2/3e or -(1/3e quarks to be 0.19 units of R.
Published: 1988

46. Search for unstable heavy neutral leptons ine+e−annihilations at√sfrom 50 to 60.8 GeV

Author: F. Naito, Kazumasa Miyano, K. Sparks, M. C.S. Williams, I. H. Park, K. Eguchi, S. Igarashi, K. Toyoshima, H. Murata, T. Ishizuka, H. Kagan, Y. C. Zhu, S. L. Olsen, L. E. Piilonen, Yusuke Higashi, Sarah Catherine Eno, Susumu Terada, Yasuhiro Sugimoto, R. L. Lander, M. Frautschi, Z. P. Mao, P. N. Kirk, Tsunehiko Omori, K. Gotow, Y. Fujii, E. H. Thorndike, H. Harada, J. Lim, Y. Yamashita, J. S. Kang, A. Abashian, Y. K. Li, A. Murakami, S. S. Myung, K. Hanaoka, Takashi Sasaki, R. L. Malchow, R. Poling, D. Blanis, P. Gu, S. Kobayashi, Yongsun Kim, C. Rosenfeld, K. Ueno, H. Asakura, R. D. Kass, Richard Breedon, H. Miyata, J. Vinson, James C. Green, J. R. Smith, Y. Sakai, H. W. Zheng, K. L. Sterner, K. Ohta, Winston Ko, T. Nozaki, Y. Ishi, Hyunyong Kim, S. Lusin, T. Kojima, R. Chiba, Hiroyuki Sagawa, E. J. Kim, Y. H. Ho, S. K. Kim, Alan Sill, S. Trentalange, D. Perticone, H. Ichinose, F. Kajino, D. H. Han, G. N. Kim, Dong-Chul Son, A. T.M. Wang, N. M. Shaw, H. S. Budd, Hideo Yokota, R. R. McNeil, Kiyosumi Tsuchiya, C. A. Fry, H. Itoh, M. E. Mattson, T. Yasuda, Kazuo Abe, J. Li, R. L. Imlay, A. Bodek, C. P. Cheng, Kaori Maeshima, T. Mori, Y. Yamagishi, Ryuki Tanaka, Y. Takaiwa, R. Coombes, A. Maki, Yoshimasa Kurihara, E. H. Low, R. C. Walker, Steve Schnetzer, T. L.T. Thomas, C. G. Trahern, T. Kumita, M. Ogawa, A. Bacala, Robert Stone, M. H. Lee, S. Matsumoto, W. Metcalf, S. Sakamoto, F. Sannes, K. P. Hu, S. Wilson, and Y. T. Xu
Subjects: Physics, Particle physics, Muon, Annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Fermion, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Boson, Lepton
Abstract: A search for unstable heavy neutral leptons has been made at center-of-mass energies from 50 to 60.8 GeV with the AMY detector at the KEK Storage ring TRISTAN. The neutral leptons are assumed to decay via mixing to electrons and muons. Events with two leptons were searched for. No evidence for their existence was found. Limits in the mass range \ensuremath{\le}28.1 GeV/${c}^{2}$ and mixing-parameter range 9\ifmmode\times\else\texttimes\fi{}${10}^{\mathrm{\ensuremath{-}}10}$\ensuremath{\le}\ensuremath{\Vert}${U}_{\mathrm{lL}}$${\ensuremath{\Vert}}^{2}$\ensuremath{\le}1 are presented for Dirac- and Majorana-type neutrinos.
Published: 1989

47. Comparison of quark and gluon jets produced in high-energye+e−annihilations

Author: H. W. Zheng, E. H. Thorndike, J. Lim, W. Metcalf, D. Blanis, H. Miyata, R. R. McNeil, Dong-Chul Son, Y. Ishi, P. Auchincloss, E. J. Kim, K. L. Sterner, Hideo Yokota, K. Toyoshima, C. A. Fry, P. Gu, T. Yasuda, F. Sannes, Takashi Sasaki, H. Itoh, K. P. Hu, A. Bacala, J. Li, S. S. Myung, Robert Stone, Y. Sugimoto, R. L. Imlay, S. Lusin, Y. Sakai, M. C.S. Williams, J. S. Kang, C. P. Cheng, Yusuke Higashi, T. Mori, Kazumasa Miyano, Tsunehiko Omori, P. N. Kirk, S. Wilson, T. Kojima, Hyunyong Kim, K. Ohta, Winston Ko, Sarah Catherine Eno, J. R. Smith, Susumu Terada, Y. Yamashita, S. Kobayashi, Y. Fujii, S. K. Kim, Y. H. Ho, L. E. Piilonen, T. Nozaki, Hiroyuki Sagawa, Yoshimasa Kurihara, F. Kajino, A. Abashian, A. Maki, C. G. Trahern, Alan Sill, David Stuart, T. Kumita, Y. K. Li, A. Murakami, D. H. Han, Z. P. Mao, G. N. Kim, R. Poling, R. L. Malchow, H. S. Budd, R. C. Walker, Richard Breedon, Steve Schnetzer, H. Harada, E. H. Low, M. E. Mattson, Y. C. Zhu, S. L. Olsen, K. Gotow, D. Perticone, Yongsun Kim, J. Vinson, R. D. Kass, Y. T. Xu, T. L.T. Thomas, M. H. Lee, A. T.M. Wang, N. M. Shaw, S. Matsumoto, K. Ueno, I. H. Park, Y. Takaiwa, T. Ishizuka, Kazuo Abe, R. L. Lander, M. Frautschi, Kaori Maeshima, Y. Yamagishi, H. Kagan, C. Rosenfeld, R. Tanaka, and A. Bodek
Subjects: Physics, Quark, Quantum chromodynamics, Particle physics, Annihilation, High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Parton, Jet (particle physics), Particle identification, Gluon, Nuclear physics, High Energy Physics::Experiment
Abstract: Three-jet events produced in {ital e}{sup +}e{sup {minus}} annihilations are used to provide comparisons between quark and gluon jets. Differences between quark-induced and gluon-induced jets are observed. Quark jets tend to have a more tightly collimated structure than gluon jets, which is reflected in the concentration of a larger fraction of the jet's energy near the jet axis.
Published: 1989

48. 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

49. Elastic scattering ofπ+andπ−fromCa40at 64.8 MeV

Author: R. D. Edge, M. E. Hamm, B. M. Preedom, M. Blecher, R. L. Burman, E. E. Gross, K. Gotow, R. D. Carlini, M. A. Yates, Murray Moinester, S. H. Dam, R. P. Redwine, and F. E. Bertrand
Subjects: Nuclear reaction, Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Distribution (mathematics), Scattering, Form factor (quantum field theory), Radius, Atomic physics, Electron scattering, S-matrix
Abstract: Angular distributions of ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ elastic scattering on $^{40}\mathrm{Ca}$ at 64.8 MeV are presented. The data are analyzed using a first-order, nonlocal optical model based on a Kisslinger $t$ matrix with an off-shell form factor. This model is unable to fit the data for any value of the off-shell parameter $\ensuremath{\alpha}$ unless the nuclear matter radius is allowed to vary from that derived from electron scattering. The resulting best-fit radii are as much as 0.40 fm larger than the electron scattering value for ${\ensuremath{\pi}}^{+}$ and 0.55 fm larger for ${\ensuremath{\pi}}^{\ensuremath{-}}$. For a given $\ensuremath{\alpha}$ the ${\ensuremath{\pi}}^{\ensuremath{-}}$ best fit radius is also consistently larger by about 0.2 fm than that for ${\ensuremath{\pi}}^{+}$. In addition, the fits show no significant preference for any value of $\ensuremath{\alpha}$ between 400 and 900 MeV/c. Inclusion of the normally omitted second-order potential terms in the optical model does not significantly alter the results.NUCLEAR REACTIONS ${\ensuremath{\pi}}^{+}$ and ${\ensuremath{\pi}}^{\ensuremath{-}}$ elastic scattering from $^{40}\mathrm{Ca}$ at 64.8 MeV; angular distributions, $15\ifmmode^\circ\else\textdegree\fi{}l{\ensuremath{\theta}}_{\mathrm{lab}}l127\ifmmode^\circ\else\textdegree\fi{}$; optical model analysis.
Published: 1982

50. Experimental evidence for the non-Abelian nature of QCD from a study of multijet events produced ine+e−annihilation

Author: W. Metcalf, I. H. Park, S. Sakamoto, T. Ishizuka, F. Naito, Kazumasa Miyano, F. Sannes, K. Sparks, K. Toyoshima, Y. C. Zhu, S. L. Olsen, Hiroyuki Sagawa, T. Mori, C. G. Trahern, T. Kumita, R. Coombes, R. R. McNeil, L. E. Piilonen, E. H. Thorndike, Sarah Catherine Eno, Susumu Terada, J. Lim, J. Li, T. Takeda, Alan Sill, R. Chiba, M. C.S. Williams, J. S. Kang, S. K. Kim, H. Kagan, S. Igarashi, H. Ichinose, J. Vinson, H. Miyata, R. L. Imlay, F. Kajino, Y. K. Li, A. Murakami, S. Kobayashi, M. H. Lee, H. S. Budd, P. N. Kirk, C. A. Fry, S. S. Myung, R. Poling, D. Blanis, C. P. Cheng, Y. Yamashita, H. Itoh, M. E. Mattson, K. Eguchi, Y. Sakai, Hideo Yokota, James C. Green, Yusuke Higashi, A. Maki, S. Lusin, K. L. Sterner, K. Ohta, Winston Ko, Yoshimasa Kurihara, A. Bacala, Y. H. Ho, Tsunehiko Omori, Robert Stone, Kazuo Abe, G. N. Kim, N. M. Shaw, Dong-Chul Son, J. R. Smith, Kaori Maeshima, Ryuki Tanaka, S. Matsumoto, Y. Takaiwa, S. Trentalange, D. Perticone, E. H. Low, P. Perez, T. L.T. Thomas, Kiyosumi Tsuchiya, A. T.M. Wang, Z. P. Mao, A. Abashian, Steve Schnetzer, H. Harada, R. L. Lander, M. Frautschi, Hyunyong Kim, K. Gotow, S. Wilson, K. Ueno, R. L. Malchow, Yongsun Kim, R. D. Kass, Y. T. Xu, H. Kozuka, T. Nozaki, Y. Ishi, H. W. Zheng, E. J. Kim, Takashi Sasaki, Y. Fujii, Yasuhiro Sugimoto, A. Bodek, and C. Rosenfeld
Subjects: Physics, Quantum chromodynamics, Coupling constant, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, General Physics and Astronomy, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Abelian group
Abstract: We present evidence for the non-Abelian nature of QCD from a study of multijet events produced in ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ annihilations from \ensuremath{\surd}s =50 to 57 GeV in the AMY detector at the KEK storage ring TRISTAN. A comparison of the three-jet event fraction at TRISTAN to the fraction of the DESY storage ring PETRA shows that the QCD coupling strength ${\ensuremath{\alpha}}_{s}$ decreases with increasing ${Q}^{2}$. In addition, measurements of the angular distributions of four-jet events show evidence for the triple-gluon vertex.
Published: 1989

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