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Start Over Author "F. Naito" Publisher american physical society (aps)
7 results on '"F. Naito"'

1. 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
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2. 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
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3. 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
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4. 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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5. Formation ofA=12Σ−Hypernucleus fromK−Absorption at Rest; Observation of aΣ−Spin-Orbit Doublet of Narrow Widths

Author

Toshimitsu Yamazaki, M. Nakajima, F. Naito, S. Ohtake, Takashi Ishikawa, Takashi Yamanaka, Kenta Tanaka, Y. Akiba, I. Arai, Toshiharu Suzuki, M. Iwasaki, Hirokazu Tamura, and Ryugo S. Hayano

Subjects
Nuclear reaction, Physics, Pion, Meson, Hadron, General Physics and Astronomy, Atomic physics, Spectroscopy, Hypernucleus, Isotopes of beryllium, Nucleon
Abstract

High-resolution spectroscopy of ..pi../sup +/ from K/sup -/ absorption at rest has been used for the first time to identify ..sigma../sup -/ hypernuclear states. The observed spectrum from a (CH)/sub n/ target has revealed a p/sub 3/2/-p/sub 1/2/ doublet of /sup 12/Be with narrow widths. The spin-orbit splitting of ..sigma../sup -/ is deduced to be 5 MeV, 0.8 times that for nucleons.

Published
1985
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6. Experimental Mass Limit for a Fourth-Generation Sequential Lepton frome+e−Annihilations ats=56GeV

Author

H. Asakura, S. Trentalange, R. Chiba, Y. Sugimoto, R. Tanaka, E. H. Thorndike, Z. P. Mao, Hiroyuki Sagawa, H. Harada, Hj Kim, Rr Mcneil, T. Nozaki, Yk Kim, A. Bacala, H. Miyata, A. Bodek, R. L. Lander, H. Kagan, Y. Yan, W. Metcalf, K. Gotow, S. Sakamoto, Robert Stone, F. Kajino, Yasuo Higashi, H. S. Budd, S. Wilson, S. K. Kim, S. S. Myung, R. Coombes, K. Toyoshima, H. Kozuka, C. G. Trahern, H. Itoh, H. Murata, Y. C. Zhu, S. L. Olsen, F. Sannes, T. Kumita, D. Zimmerman, K. Eguchi, I. H. Park, T. Sasaki, H. W. Zheng, S. Chakrabarti, Tsunehiko Omori, R. L. Malchow, R. D. Kass, G. N. Kim, T. Takeda, T. Mori, A. Sill, Y. Ishi, T. Ishizuka, K. Ohta, Winston Ko, C. A. Fry, S. Kobayashi, Y. H. Ho, L. E. Piilonen, D. Blanis, A. Abashian, S. Lusin, E. J. Kim, Smith, Y. T. Xu, J. S. Kang, Y. Fujii, C. Darden, Steve Schnetzer, K. Ueno, A. Maki, M. H. Lee, Kazuo Abe, Y. Sakai, Kaori Maeshima, S. Matsumoto, C. P. Cheng, M. Ogawa, Dong-Chul Son, P. Perez, K. Miyano, Kiyosumi Tsuchiya, Yoshimasa Kurihara, E. H. Low, A. Murakami, N. M. Shaw, Y. Takaiwa, M. C.S. Williams, P. N. Kirk, Y. Yamashita, K. Hanaoka, R. Poling, James C. Green, F. Naito, K. Sparks, M. Frautschi, Sarah Catherine Eno, Susumu Terada, H. Yokota, S. Igarashi, R. Imlay, R. Childers, and C. Rosenfeld

Subjects
Physics, Particle physics, Annihilation, High Energy Physics::Phenomenology, General Physics and Astronomy, Elementary particle, Fermion, Spectral line, Nuclear physics, Pair production, High Energy Physics::Experiment, Limit (mathematics), Nuclear Experiment, Event (particle physics), Lepton
Abstract

A search for pair production for fourth-generation sequential leptons in e/sup +/e/sup -/ annihilation at a center-of-mass energy ..sqrt..s = 56 GeV is reported. Event topologies corresponding to the cases where one particle decays leptonically while the other decays hadronically as well as those where both particles decay hadronically were explored. We set a 95%-confidence-level lower limit of 27.6 GeV/c/sup 2/ for the mass of a fourth-generation lepton.

Published
1988
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7. Study of the radiative decayK+→μ+νγ

Author

Ryugo S. Hayano, Hirokazu Tamura, M. Nakajima, Y. Akiba, S. Ohtake, I. Arai, Takashi Yamanaka, F. Naito, Toshiharu Suzuki, T. Yamazaki, M. Iwasaki, T. Ishikawa, and Kenta Tanaka

Subjects
Physics, Nuclear physics, Antiparticle, Muon, Meson, Spectrometer, Physics::Instrumentation and Detectors, Branching fraction, Bremsstrahlung, High Energy Physics::Experiment, Neutrino, Lepton
Abstract

The radiative decay K/sup +/..--> mu../sup +/..nu gamma.. has been studied by a high-resolution magnetic spectrometer combined with a NaI(Tl) photon detector system. The momentum spectrum of muon from this decay mode was measured in the region 214.5

Published
1985
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