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1. Search of J/ψ production in the two-photon process at TRISTAN

Author

Y. Takada, Y. Chiba, Masami Chiba, Taro Ohama, Yoshiyuki Watase, Koji Abe, E. K. Matsuda, Motomasa Daigo, N. Tamura, T. Watanabe, Yasushige Yonezawa, T. Matsui, M. Sato, Y. Asano, Hiroshi Sakamoto, Nobuhiro Ishihara, T. Kondo, Y. Nagashima, H. Yoshida, Makoto Sakuda, Y. Nakagawa, Mineo Fukawa, Masato Higuchi, M. Takita, Itsuo Nakano, J. Haba, Ryusaburo Kikuchi, H. Hamasaki, H. Ohyama, K. Ogawa, Nobuaki Sato, M. Shioden, T. Ohsugi, Yasutaka Fukushima, Shigeki Mori, D. Tatsumi, F. Yabuki, K. Amako, K. Tobimatsu, T. Sumiyoshi, Junichi Kanzaki, Hisaya Kurashige, Y. Yamada, Yasuo Hemmi, S. Uehara, Teruo Nakamura, Y. Iwata, T. T. Korhonen, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, Yasuhiro Homma, Tachishige Hirose, J. Shirai, K. Okabe, Fumihiko Takasaki, A. Okamoto, A. Ono, J. Pennanen, T. Yamagata, Yoshinobu Unno, Y. Arai, and K. Yusa

Subjects
Physics, Nuclear and High Energy Physics, biology, 010308 nuclear & particles physics, Detector, Venus, biology.organism_classification, 01 natural sciences, law.invention, Nuclear physics, law, 0103 physical sciences, High Energy Physics::Experiment, Production (computer science), 010306 general physics, Collider
Abstract

An experimental study was carried out for J/ψ production in a two-photon process using the VENUS detector at the TRISTAN e+e− collider. The study was based on 357 pb−1 data at an average e+e− center-of-mass energy of 58 GeV. No significant signal was observed, and the upper limit of the production cross section was obtained.

Published
2001

2. Measurement of the charged multiplicity of bottom and light quark events in e+e− annihilation at GeV

Author

H. Hamasaki, Yoshiyuki Watase, Y. Nakagawa, T. Watanabe, T. Matsui, Y. Iwata, Y. Takada, Y. Asano, Masami Chiba, Koji Abe, Taro Ohama, K. Ogawa, Motomasa Daigo, A. Ono, Nobuaki Sato, T. Ohsugi, E. K. Matsuda, T. Kondo, Junichi Kanzaki, Ryusaburo Kikuchi, H. Ohyama, K. Amako, K. Tobimatsu, Y. Yamada, Makoto Sakuda, Hiroshi Sakamoto, M. Sato, Fumihiko Takasaki, T. Yamagata, A. Okamoto, J. Shirai, Masato Higuchi, Itsuo Nakano, Y. Arai, M. Shioden, N. Tamura, K. Yusa, Tachishige Hirose, Yoshinobu Unno, Y. Nagashima, J. Pennanen, T. Sumiyoshi, Y. Chiba, Yasuo Hemmi, S. Uehara, F. Yabuki, Yasutaka Fukushima, Nobuhiro Ishihara, D. Tatsumi, Teruo Nakamura, T. T. Korhonen, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, Shigeki Mori, J. Haba, Yasushige Yonezawa, M. Fukawa, K. Okabe, M. Takita, H. Yoshida, Hisaya Kurashige, and Yasuhiro Homma

Subjects
Physics, Quark, Nuclear and High Energy Physics, Top quark, Particle physics, Annihilation, 010308 nuclear & particles physics, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Theoretical models, Multiplicity (mathematics), 7. Clean energy, 01 natural sciences, Bottom quark, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Event (particle physics), Lepton
Abstract

The charged-particle multiplicity is measured for b -quark and light-quark ( u , d , s ) events in e + e − annihilation at s =58 GeV. Two independent methods, lepton tagging and decay-length tagging, are applied to enrich b -quark events. These methods provide event samples having different concentrations of b -quark events. The mean charged multiplicity is measured to be 19.38±0.27±0.84 for b -quark events, and 15.91±0.04±0.70 for light-quark events. The results are compared with predictions of phenomenological and theoretical models.

Published
1998

3. Measurement of the proton-antiproton pair production from two-photon collisions at TRISTAN

Author

Makoto Sakuda, H. Hamasaki, Tachishige Hirose, Yoshinobu Unno, Y. Iwata, M. Sato, Yoshiyuki Watase, Y. Asano, A. Ono, Nobuaki Sato, Koji Abe, Shigeki Mori, D. Tatsumi, Y. Arai, Fumihiko Takasaki, E. K. Matsuda, T. Watanabe, T. Matsui, H. Hanai, Y. Yamada, I. Nakano, N. Tamura, Y. Takada, T. Kondo, T. Ohsugi, K. Yusa, Yasuo Hemmi, Masami Chiba, S. Uehara, K. Tobimatsu, A. Okamoto, Taro Ohama, H. Ohyama, K. Amako, Motomasa Daigo, Y. Nakagawa, Yasutaka Fukushima, Hiroshi Sakamoto, T. Sumiyoshi, T. Yamagata, Masato Higuchi, J. Haba, K. Ogawa, Ryusaburo Kikuchi, M. Shioden, J. Shirai, J. Pennanen, Y. Nagashima, M. Takita, H. Yoshida, Hisaya Kurashige, Junichi Kanzaki, Yasuhiro Homma, K. Okabe, Nobuhiro Ishihara, Teruo Nakamura, T. T. Korhonen, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, Y. Chiba, Yasushige Yonezawa, M. Fukawa, and F. Yabuki

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Proton, 010308 nuclear & particles physics, 01 natural sciences, 7. Clean energy, law.invention, Nuclear physics, Diquark, Cross section (physics), Pair production, Two-photon excitation microscopy, Antiproton, law, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Collider
Abstract

The cross section of the γγ → p p reaction was measured at two-photon center-of-mass energy (Wγγ) between 2.2 and 3.3 GeV, using the two-photon process at an e+e− collider, TRISTAN. The Wγγ dependence of the cross section integrated over a c.m. angular region of | cos θ ∗ | is in good agreement with the previous measurements and the theoreticalv prediction based on diquark model in the high Wγγ region.

Published
1997

4. A study of single photon production in e+ e− annihilation at = 58

Author

Y. Yamamoto, Nobuhiro Ishihara, Yasuo Hemmi, T. Sumiyoshi, S. Uehara, J. MacNaughton, Hiroshi Sakamoto, N. Kanda, Makoto Sakuda, M. Miura, M. Sato, A. Ohyama, Tatsumi Arima, H. Hanai, H. Takaki, Teruo Nakamura, K. Tobimatsu, Shigeki Mori, Koji Abe, H. Yoshida, Y. Chiba, Tachishige Hirose, T. T. Korhonen, Toru Tsuboyama, T. Ohsugi, A. Suzuki, E. K. Matsuda, Kozo Miyake, Fujio Hinode, Shigeru Odaka, J. Shirai, Masato Higuchi, Junichi Kanzaki, Yasutaka Fukushima, A. E. Krüger, Yoshiyuki Watase, Fumihiko Takasaki, Mineo Fukawa, Yasushige Yonezawa, Y. Yamada, A. Okamoto, T. Yamagata, Y. Nagashima, M. Shioden, M. Shirakata, T. Matsui, Hisaya Kurashige, Y. Hoshi, Michiaki Utsumi, F. Yabuki, Nobuyuki Kanematsu, Yasuhiro Homma, Ryusaburo Kikuchi, M. Takita, N. Tamura, Y. Takada, Masami Chiba, Taro Ohama, Motomasa Daigo, Yoshinobu Unno, Y. Arai, Y. Nakagawa, T. Kondo, T. Oyama, Y. Iwata, J. Haba, K. Amako, Y. Asano, I. Nakano, Nobuaki Sato, A. Ono, and N. Hosoda

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Photon, Electron–positron annihilation, Elementary particle, lcsh:QC1-999, Standard Model, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Photino, lcsh:Physics
Abstract

We have studied single photon production in e + e − annihilation based on a data sample corresponding to an integrated luminosity of 164.1 pb −1 at s =58 GeV . The single photon yield is consistent with the prediction of the standard model with three light neutrino species. No anomalous signal has been observed. From this result left- and right-handed scalar electrons in the mass degenerate case are excluded at 90% CL below 44.4 GeV/ c 2 for the massless photino.

Published
1994

5. A study of charged D∗ production in e+e− annihilation at an average center-of-mass energy of 58 GeV

Author

Hisaya Kurashige, Yasuhiro Homma, A. Ono, T. Ohsugi, Nobuhiro Ishihara, M. Sato, Y. Asano, K. Amako, Yasuo Hemmi, Y. Arai, S. Uehara, Tachishige Hirose, Y. Nagashima, A. Suzuki, Ryusaburo Kikuchi, N. Hosoda, N. Kanda, Junichi Kanzaki, K. Tobimatsu, T. Sumiyoshi, Teruo Nakamura, F. Yabuki, H. Yoshida, T. T. Korhonen, J. Haba, M. Takita, Toru Tsuboyama, Kozo Miyake, Makoto Sakuda, T. Ogawa, Shigeru Odaka, Y. Hoshi, Yoshinobu Unno, Nobuyuki Kanematsu, N. Tamura, Masato Higuchi, J. Shirai, T. Kondo, T. Yamagata, Yasutaka Fukushima, T. Oyama, Y. Chiba, Yasushige Yonezawa, Mineo Fukawa, M. Shirakata, M. Miura, H. Takaki, Y. Takada, Y. Yamada, Masami Chiba, Taro Ohama, Motomasa Daigo, Tatsumi Arima, Fujio Hinode, Fumihiko Takasaki, A. Okamoto, Shigeki Mori, Yoshiyuki Watase, T. Matsui, H. Ohyama, J. MacNaughton, Hiroshi Sakamoto, M. Shioden, Koji Abe, M. Utsumi, Nobuaki Sato, E. Kanatani, I. Nakano, and A. E. Krüger

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Elementary particle, 01 natural sciences, Charged particle, lcsh:QC1-999, Charm quark, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, lcsh:Physics
Abstract

We have studied the production of charged D ∗ mesons in e + e − annihilation at an average center-of-mass energy of 58.0 GeV. Charged D ∗ mesons were identified using two independent methods; the mass-difference method and the detection of the low transverse-momentum pion. The forward-backward asymmetry of the charm quark production was measured to be A c = −0.61±0.13(stat.)±0.08(syst.). The cross section of inclusive D ∗ production was found to be σ(e + e − →D ∗ ± +X) = 24.5 ± 5.3 ( stat. )±3.0( syst. ) pb. If we assume the standard model prediction for the charm quark production, we obtain the branching ratio for the charm quark to produce a charged D ∗ meson to be Br (c→D ∗+ + X) = (22±5( stat. )±3( syst. ))% .

Published
1993

6. Search for heavy neutral spinless particles using e+e− → e+e− and e+e− → γγ reactions in the CM energy range between 54 and 64 GeV

Author

N. Hosoda, Y. Hoshi, J. Shirai, Yoshiyuki Watase, N. Kanda, Nobuyuki Kanematsu, T. Oyama, Y. Chiba, Nobuhiro Ishihara, H. Takaki, T. Sumiyoshi, T. Yamagata, Fujio Hinode, Y. Asano, Makoto Sakuda, Y. Takada, M. Shioden, T. Matsui, Fumihiko Takasaki, Y. Arai, Y. Yamada, N. Tamura, Masami Chiba, Taro Ohama, H. Ohyama, K. Amako, A. Okamoto, Yasushige Yonezawa, Junichi Kanzaki, Motomasa Daigo, Koji Abe, Yoshinobu Unno, J. MacNaughton, Hiroshi Sakamoto, Y. Nagashima, M. Shirakata, M. Sato, T. Ohsugi, Michiaki Utsumi, A. E. Krüger, Teruo Nakamura, H. Yoshida, T. T. Korhonen, Yasutaka Fukushima, Tatsumi Arima, M. Miura, Toru Tsuboyama, Hisaya Kurashige, Kozo Miyake, Shigeru Odaka, Shigeki Mori, T. Kondo, Yasuhiro Homma, Mineo Fukawa, J. Haba, K. Ogawa, F. Yabuki, Tachishige Hirose, A. Suzuki, Yasuo Hemmi, S. Uehara, K. Tobimatsu, A. Ono, Nobuaki Sato, E. Kanatani, I. Nakano, Ryusaburo Kikuchi, Masato Higuchi, and M. Takita

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, 010308 nuclear & particles physics, Electron, 01 natural sciences, Resonance (particle physics), Nuclear physics, 0103 physical sciences, Particle, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, Energy (signal processing)
Abstract

Heavy neutral spinless particles are searched for using e + e − collision data of CM energies between 54 and 64 GeV, collected with the VENUS detector at TRISTAN. The existence of such a particle might explain the anomalous e + e − → l + l − γγ reaction recently reported by a LEP experiment. Negative results lead to constraints on the partial decay width of such particles to electrons: in narrow resonance cases, Γ ee Γ ee ΓB γγ c 2 .

Published
1993

7. Measurement of forward-backward charge asymmetry in the process of b-quark production in e+e− annihilation around √s=60 GeV

Author

N. Kanda, Teruo Nakamura, T. T. Korhonen, Toru Tsuboyama, T. Kondo, Kozo Miyake, Shigeru Odaka, M. Shirakata, T. Sumiyoshi, S. Sugimoto, Fujio Hinode, Makoto Sakuda, Fumihiko Takasaki, Tachishige Hirose, A. Suzuki, Toru Fukui, T. Oyama, K. Amako, Nobuhiro Ishihara, A. Okamoto, J. Shirai, K. Tobimatsu, Yoshiyuki Watase, Masato Higuchi, F. Yabuki, Yasuo Hemmi, Hisaya Kurashige, S. Uehara, Y. Asano, T. Watanabe, Yasutaka Fukushima, N. Terunuma, T. Koseki, Shigeki Mori, Yasuhiro Homma, Ryusaburo Kikuchi, M. Sato, M. Utsumi, Yoshinobu Unno, Y. Takada, T. Matsui, H. Takaki, H. Yoshida, Y. Nagashima, J. Haba, Masami Chiba, M. Takita, A. Taketani, Y. Chiba, J. MacNaughton, Hiroshi Sakamoto, Taro Ohama, Motomasa Daigo, Y. Arai, K. Ogawa, N. Tamura, Y. Yamada, Y. Narita, Koji Abe, Mineo Fukawa, M. Shioden, T. Ohsugi, I. Nakano, H. Shibuya, M. Minami, N. Sasao, A. Ono, Yasushige Yonezawa, Junichi Kanzaki, Y. Hoshi, and Nobuyuki Kanematsu

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, 010308 nuclear & particles physics, High Energy Physics::Lattice, media_common.quotation_subject, Nuclear Theory, High Energy Physics::Phenomenology, Charge (physics), 01 natural sciences, Bottom quark, Asymmetry, Standard Model, Nuclear physics, Isospin, 0103 physical sciences, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, 010306 general physics, Lepton, media_common
Abstract

We have measured the forward-backward charge asymmetry in the process of b-quark production in e + e − annihilation at TRISTAN. It was made possible by detecting prompt leptons from b-quarks. The obtained asymmetry is A = −0.55±0.15±0.08. If corrected for B-meson mixing effects with the assumptions given in the text, the asymmetry becomes A = f −0.78±0.21±0.11, which is consistent with the prediction of the standard model, namely the assignment of the b-quark to the isospin doublet of the third quark generation.

Published
1992

8. Measurement of the forward-backward asymmetry of charm quark production in e+e- annihilations at

Author

Fujio Hinode, Teruo Nakamura, T. T. Korhonen, Fumihiko Takasaki, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, A. Okamoto, T. Oyama, A. Taketani, N. Kanda, M. Minami, Nobuhiro Ishihara, Y. Asano, A. Ono, Yasuo Hemmi, Makoto Sakuda, S. Sugimoto, Junichi Kanzaki, N. Terunuma, S. Uehara, T. Ohsugi, J. MacNaughton, H. Takaki, Hiroshi Sakamoto, Tachishige Hirose, Shigeki Mori, Ryusaburo Kikuchi, I. Nakano, A. Suzuki, H. Shibuya, J. Haba, Y. Arai, S. Shirakata, M. Shioden, Y. Yamada, J. Shirai, Yoshiyuki Watase, K. Ogawa, M. Utsumi, Y. Hoshi, H. Yoshida, N. Sasao, M. Sato, M. Takita, Nobuaki Sato, Nobuyuki Kanematsu, Y. Chiba, N. Tamura, Hisaya Kurashige, Koji Abe, T. Matsui, T. Kamitani, Toru Fukui, K. Tobimatsu, T. Kondo, T. Koseki, Yasuhiro Homma, K. Amako, T. Watanabe, Yoshinobu Unno, Masato Higuchi, Y. Narita, Yasushige Yonezawa, Yoshifumi Hojo, Y. Takada, Masami Chiba, Taro Ohama, Motomasa Daigo, Yasutaka Fukushima, Mineo Fukawa, Y. Nagashima, T. Sumiyoshi, and F. Yabuki

Subjects
Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, media_common.quotation_subject, Venus, Astrophysics::Cosmology and Extragalactic Astrophysics, 01 natural sciences, Asymmetry, law.invention, Charm quark, Nuclear physics, law, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Collider, media_common, Physics, Coupling constant, biology, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Charge (physics), biology.organism_classification, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics
Abstract

The forward-backward asymmetry of charm quark production has been measured at an average of energy of 58.4 GeV with the VENUS detector at the TRISTAN e+e- collider. The charm quarks were identified through reconstruction of charged D∗ mesons using the mass difference between the D∗ and D0 mesons. The measured charge asymmetry, -0.49+.019−0.17±0.04, is consistent with the prediction of the standard theory. The corresponding axial-vector coupling constant is 1.03+0.40−0.35±0.07.

Published
1992

9. Search for charged scalars in e+e− annihilation up to 64 GeV CM energy

Author

Y. Hoshi, Nobuyuki Kanematsu, Yasuo Hemmi, Ryusaburo Kikuchi, S. Uehara, M. Takita, Y. Takada, M. Utsumi, Masami Chiba, Tachishige Hirose, M. Sato, S. Sugimoto, Taro Ohama, N. Kanda, Motomasa Daigo, Teruo Nakamura, A. Suzuki, J. MacNaughton, Makoto Sakuda, T. T. Korhonen, Hiroshi Sakamoto, M. Shirakata, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, Y. Hojyo, J. Shirai, Toru Fukui, T. Oyama, K. Tobimatsu, Y. Arai, H. Takaki, Fujio Hinode, Nobuhiro Ishihara, Koji Abe, T. Kondo, H. Yoshida, M. Minami, Yoshiyuki Watase, A. Taketani, Mineo Fukawa, I. Nakano, Junichi Kanzaki, Fumihiko Takasaki, H. Shibuya, A. Ono, T. Watanabe, T. Ohsugi, A. Okamoto, N. Tamura, Masato Higuchi, F. Yabuki, Yoshinobu Unno, Y. Yamada, M. Shioden, J. Haba, T. Matsui, K. Ogawa, Y. Asano, Hisaya Kurashige, K. Amako, N. Terunuma, Yasuhiro Homma, Y. Chiba, T. Sumiyoshi, T. Yuzuki, Shigeki Mori, Y. Nagashima, Yasutaka Fukushima, Y. Narita, T. Kamitani, T. Koseki, Noboru Sasao, and Yasushige Yonezawa

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Luminosity (scattering theory), biology, Venus, Fermion, biology.organism_classification, Positive evidence, Nuclear physics, High Energy Physics::Experiment, Center of mass, Energy (signal processing)
Abstract

A search for the production of charged scalars has been carried out in e+e− annihilation at center of mass energies up to 64 GeV with 61.1 pb−1 of integrated luminosity using the VENUS detector at TRISTAN. The assumptions concerning the production and decay of hypothetical charged scalars are minimal; they are expected to be singly charged and decay into a pair of fermions. No positive evidence for their production has been found in a study of all combinations of the l ν(l ν ) and U D ( U D ) decay channels. We have excluded the mass region of 8.0–20.0 GeV/c2 regardless of the decay mode.

Published
1991

10. Search for χc2 production in two-photon processes

Author

Yasuo Hemmi, S. Uehara, Fujio Hinode, T. Kondo, Teruo Nakamura, T. T. Korhonen, Toru Tsuboyama, Hiroyuki Takaki, T. Ohsugi, M. Minami, A. Taketani, Kozo Miyake, Shigeru Odaka, T. Kamitani, M. Fukuwa, A. Ono, N. Kanda, T. Watanabe, M. Shirakata, J. Haba, Yasutaka Fukushima, T. Oyama, Ryusaburo Kikuchi, Nobuhiro Ishihara, K. Ogawa, T. Sumiyoshi, Y. Chiba, Y. Yamada, Makoto Sakuda, Fumihiko Takasaki, Yasushige Yonezawa, N. Sasao, Y. Asano, M. Sato, N. Terunuma, F. Yabuki, A. Okamoto, K. Amako, M. Shioden, M. Utsumi, K. Abe, H. Yoshida, Y. Takada, Masato Higuchi, Y. Hojyo, Y. Nagashima, Y. Arai, M. Takita, Masami Chiba, Taro Ohama, Motomasa Daigo, Junichi Kanzaki, Y. Narita, Y. Hoshi, Nobuyuki Kanematsu, I. Nakano, Y. Unno, H. Shibuya, Hisaya Kurashige, N. Tamura, Yasuhiro Homma, Hiroshi Sakamoto, Yoshiyuki Watase, Toru Fukui, K. Tobimatsu, T. Matsui, S. Sugimoto, Tachishige Hirose, T. Koseki, Shigeki Mori, A. Suzuki, and J. Shirai

Subjects
Physics, Signal enhancement, Nuclear and High Energy Physics, Two-photon excitation microscopy, 010308 nuclear & particles physics, 0103 physical sciences, Invariant mass, Production (computer science), State (functional analysis), Atomic physics, 010306 general physics, 01 natural sciences
Abstract

A search has been made for the production of a charmonium state χ c 2 in two-photon processes. We have used the decay channel χ c 2 → γ J/ ψ , J/ ψ →l + l − . No signal enhancement indicating the production of χ c2 has been observed in the invariant mass distributions of the final state particles, and an upper limit for the two-photon decay width, Γ γγ ( χ c2 ) keV at 95% CL, has been obtained.

Published
1991

11. Study of the e+e− → μ+μ−γ reaction at center-of-mass energies between 54 and 64 GeV

Author

Ryusaburo Kikuchi, I. Nakano, H. Shibuya, Hisaya Kurashige, Y. China, M. Utsumi, M. Takita, Y. Narita, N. Kanda, Yasuhiro Homma, T. Kondo, M. Sato, Y. Hoshi, Fujio Hinode, Nobuyuki Kanematsu, H. Takaki, Makoto Sakuda, K. Amako, M. Shioden, Toru Fukui, T. Kosemi, Y. Yamada, Fumihiko Takasaki, K. Tobimatsu, N. Sasao, Teruo Nakamura, H. Yoshida, Y. Nagashima, T. Sumiyoshi, S. Sugimoto, Hiroshi Sakamoto, Yasushige Yonezawa, A. Okamoto, Masato Higuchi, Koji Abe, J. Haba, K. Ogawa, Y. Takada, Masami Chiba, Taro Ohama, Motomasa Daigo, M. Shirakata, T. Kamitani, Mineo Fukawa, Y. Arai, Shigeki Mori, T. T. Korhonen, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, T. Oyama, Y. Asano, N. Terunuma, Yasutaka Fukushima, Nobuhiro Ishihara, F. Yabuki, A. Taketani, T. Watanabe, Yoshinobu Unno, Yoshiyuki Watase, T. Matsui, N. Tamura, T. Ohsugi, Y. Hojyo, Junichi Kanzaki, M. Minami, A. Ono, Yasuo Hemmi, S. Uehara, Tachishige Hirose, A. Suzuki, and J. Shirai

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Luminosity (scattering theory), biology, 010308 nuclear & particles physics, media_common.quotation_subject, Electroweak interaction, Charge (physics), Venus, biology.organism_classification, 01 natural sciences, 7. Clean energy, Asymmetry, Nuclear physics, Cross section (physics), 0103 physical sciences, Center of mass, 010306 general physics, media_common
Abstract

The cross section and forward-backward muon charge asymmetry for the e+e−→μ+μ−γ reaction were measured to be σ=2.82±0.35 pb and A=−0.34±0.10 with the VENUS detector at TRISTAN at 〈√s〉=59.2GeV for an integrated luminosity of 53.5 pb−1. The measured cross section agrees with the theoretical prediction. The asymmetry result is consistent with the electroweak prediction but not with the QED prediction at the level of 2σ.

Published
1991

12. Experimental limits on extra-Z bosons from e+e− annihilation data with the VENUS detector at

Author

K. Amako, Nobuhiro Ishihara, T. Kondo, Y. Takada, Ichita Endo, F. Yabuki, Shigeki Mori, T. Ohsugi, Masami Chiba, J. Haba, Taro Ohama, K. Ogawa, M. Takita, Motomasa Daigo, T. Watanabe, M. Sato, I. Nakano, M. Shioden, Y. Asano, A. Taketani, Teruo Nakamura, R. Tanaka, Makoto Sakuda, Y. Ikegami, N. Terunuma, Mineo Fukawa, I. Hayashibara, Toru Tsuboyama, M. Sakano, Kozo Miyake, Shigeru Odaka, Yoshishige Suzuki, Yoshinobu Unno, H. Yoshida, M. Minami, Y. Yamada, Toru Fukui, Ryusaburo Kikuchi, Y. Hoshi, Nobuyuki Kanematsu, M. Shirakata, H. Saito, K. Tobimatsu, Y. Chiba, Y. Narita, A. Ono, H. Osabe, Fumihiko Takasaki, M. Utsumi, K. Kubo, T. Yamashita, T. Kamitani, F. Suekane, Yasushige Yonezawa, S. Sakamoto, H. Sakae, Hisaya Kurashige, Y. Arai, A. Okamoto, S. Sugimoto, Yasutaka Fukushima, A. Tsukamoto, T. Koseki, Yasuhiro Homma, M. Wakai, T. Sumiyoshi, Hiroshi Sakamoto, Koji Abe, Masato Higuchi, Yoshiyuki Watase, Y. Nagashima, N. Sasao, T. Oyama, T. Yamagata, T. Matsui, Junichi Kanzaki, N. Tamura, Y. Hojyo, Tachishige Hirose, A. Suzuki, Tsuneo Emura, J. Shirai, Yasuo Hemmi, and S. Uehara

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Standard Model, Nuclear physics, Grand Unified Theory, High Energy Physics::Experiment, Boson, Lepton
Abstract

We have tested extra Z models in the reactions e+e−→μ+μ−, τ+τ− and hadrons in the energy range 50 s GeV using the VENUS detector at the TRISTAN e+e− storage ring. Our data are in good agreement with the standard model prediction ( χ 2 N Df = 2.9 31 ) ). We have obtained 90% confidence-level lower limits of 105, 125 and 231 GeV for the masses of ZΨ, Zη and Zχ bosons which are expected from the E6 grand unified theory. We also place a 90% confidence-level lower limit of 426 GeV for the mass of an extra-Z boson whose couplings to quarks and leptons are assumed to be the same as those for the standard Z boson. Our results exceed the previous experimental limits from the p p collider experiments, although there have been some combined analyses reporting the limits better than those obtained in the present analysis.

Published
1990

13. Determination of the QCD scale parameter with QCD cascade on the basis of the next-to-leading logarithmic approximation

Author

A. Taketani, Y. Hoshi, Nobuyuki Kanematsu, M. Utsumi, Koji Abe, T. Ohsugi, M. Shirakata, M. Takita, K. Amako, Shigeki Mori, M. Sato, F. Yabuki, Toru Fukui, K. Tobimatsu, H. Yoshida, M. Minami, H. Sakae, A. Ono, Hiroshi Sakamoto, D. Haidt, Y. Narita, Y. Yamada, J. Haba, M. Shioden, A. Tsukamoto, K. Ogawa, Mineo Fukawa, Makoto Sakuda, Y. Takada, T. Kondo, Masami Chiba, Yoshiyuki Watase, T. Watanabe, R. Tanaka, Taro Ohama, I. Nakano, Motomasa Daigo, N. Tamura, S. Sakamoto, Ryusaburo Kikuchi, T. Kamitani, Yoshinobu Unno, T. Matsui, Y. Ikegami, Masato Higuchi, Y. Arai, M. Sakano, H. Osabe, Fumihiko Takasaki, Y. Chiba, H. Saito, T. Oyama, T. Yamashita, Yoshishige Suzuki, A. Okamoto, S. Sugimoto, Hisaya Kurashige, Y. Asano, N. Terunuma, Y. Nagashima, Yasuhiro Homma, N. Sasao, T. Yamagata, Tachishige Hirose, A. Suzuki, Yasutaka Fukushima, Tsuneo Emura, M. Wakai, T. Sumiyoshi, J. Shirai, Yasuo Hemmi, S. Uehara, Nobuhiro Ishihara, Teruo Nakamura, Toru Tsuboyama, Kozo Miyake, Shigeru Odaka, Junichi Kanzaki, I. Hayashibara, Yasushige Yonezawa, Yoshifumi Hojo, and T. Koseki

Subjects
Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Logarithm, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Renormalization, Nuclear physics, Cascade, High Energy Physics::Experiment, Nuclear Experiment, Scale parameter
Abstract

The relative production ratio of 3-jet events to the total number of hadronic events was studied in e+e− annihilations at centre-of-mass energies between 54 and 61.4 GeV. The QCD scale parameter has been determined to be Λ MS =254 −47 +55 ±56 MeV on the basis of a QCD cascade with the next-to-leading logarithmic approximation.

Published
1990

14. Search for susy partners of charged leptons in e+e− collisions with up to 60.8 GeV

Author

Hiroshi Sakamoto, Toru Fukui, K. Tobimatsu, M. Minami, Ichita Endo, A. Ono, Masato Higuchi, N. Tamura, T. Ohsugi, Teruo Nakamura, Y. Hojyo, Yoshiyuki Watase, Ryusaburo Kikuchi, Toru Tsuboyama, M. Wakai, Kozo Miyake, Shigeki Mori, N. Sasao, T. Yamagata, Y. Ikegami, J. Haba, Shigeru Odaka, T. Sumiyoshi, A. Taketani, Makoto Sakuda, K. Ogawa, T. Oyama, H. Yoshida, K. Amako, H. Osabe, Fumihiko Takasaki, Y. Chiba, Koji Abe, T. Matsui, R. Tanaka, Nobuhiro Ishihara, T. Kamitani, T. Yamashita, T. Watanabe, Yasuo Hemmi, M. Sakano, A. Okamoto, T. Kondo, S. Uehara, H. Saito, Y. Asano, Yoshinobu Unno, Junichi Kanzaki, N. Terunuma, Y. Arai, Y. Nagashima, S. Sugimoto, I. Hayashibara, Yasushige Yonezawa, Yasutaka Fukushima, Tachishige Hirose, Tsuneo Emura, J. Shirai, M. Shioden, Y. Yamada, Y. Narita, M. Utsumi, D. Haidt, H. Sakae, Y. Takada, M. Sato, S. Sakamoto, Masami Chiba, Taro Ohama, Y. Hoshi, Motomasa Daigo, I. Nakano, Nobuyuki Kanematsu, Mineo Fukawa, Yoshishige Suzuki, Hisaya Kurashige, Yasuhiro Homma, T. Koseki, and A. Tsukamoto

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Pair production, Electron–positron annihilation, High Energy Physics::Phenomenology, Degenerate energy levels, Scalar (physics), High Energy Physics::Experiment, Supersymmetry, Lepton
Abstract

Supersymmetric partners of charged leptons, scalar leptons were searched for in e + e − collisions at TRISTAN with center-of-mass energies up to 60.8 GeV. The pair production of unstable scalar leptons were searched for among identified lepton-pair events, and stable ones among collinear two-track events. No evidence was found for them. Mass limits are presented for both large-splitting and degenerate cases.

Published
1990

15. A study on single photon production at √s=54.0–61.4 GeV

Author

Toru Fukui, K. Tobimatsu, M. Minami, T. Ohsugi, M. Wakai, Hiroshi Sakamoto, T. Sumiyoshi, T. Koseki, A. Ono, M. Takita, Masato Higuchi, Y. Hojyo, Tachishige Hirose, Makoto Sakuda, M. Sato, T. Kamitani, Yoshishige Suzuki, A. Tsukamoto, M. Utsumi, Yoshiyuki Watase, Koji Abe, R. Tanaka, N. Tamura, Tsuneo Emura, J. Shirai, Hisaya Kurashige, Y. Nagashima, Y. Narita, Y. Hoshi, T. Matsui, Nobuyuki Kanematsu, Ryusaburo Kikuchi, M. Sakano, I. Nakano, Yasuhiro Homma, H. Saito, Yasutaka Fukushima, T. Oyama, Yasuo Hemmi, S. Uehara, S. Sugimoto, Y. Asano, A. Taketani, H. Osabe, Fumihiko Takasaki, A. Okamoto, T. Kondo, Y. Arai, N. Terunuma, Teruo Nakamura, Ichita Endo, H. Yoshida, H. Sakae, Toru Tsuboyama, D. Haidt, Kozo Miyake, Shigeru Odaka, Y. Chiba, S. Shirakata, Junichi Kanzaki, Nobuhiro Ishihara, S. Suzuki, Y. Takada, T. Yamashita, T. Watanabe, N. Sasao, K. Amako, Masami Chiba, Taro Ohama, Motomasa Daigo, Y. Ikegami, T. Yamagata, Yoshinobu Unno, M. Shioden, Y. Yamada, J. Haba, K. Ogawa, I. Hayashibara, Yasushige Yonezawa, Mineo Fukawa, S. Sakamoto, F. Yabuki, and Shigeki Mori

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), biology, Electron–positron annihilation, Detector, Venus, biology.organism_classification, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Neutrino
Abstract

A study of single photon events, produced in association with light neutrinos or other weakly interacting neutral particlaes in e + e − collisions, has been performed at √ s =54.0–61.4 GeV with the VENUS detector at TRISTAN. No anomalous signal has been observed in a data sample corresponding to an integrated luminosity of 28.2 pb −1 . This result indicates that the upper limit on the number of light neutrinos, N ν , is 11 (15) at a 90 (95)% confidence level. Combining this with published results from other e + e − experiments, the number of light neutrinos is limited to N ν

Published
1989

16. Measurement of R and search for new heavy quarks in e+e− annihilation at 50 and 52 GeV centre-of-mass energies

Author

M. Minami, A. Ono, Toru Fukui, T. Kamitani, Y. Takada, Junichi Kanzaki, Y. Ikegami, Taro Ohama, Motomasa Daigo, I. Hayashibara, Nobuhiro Ishihara, A. Tsukamoto, Ichita Endo, Takashi Ohsugi, Keisuke Maehata, Yoshiyuki Watase, K. Abe, Makoto Sakuda, Yasutaka Fukushima, M. Shioden, Ryusaburo Kikuchi, Y. Hojyo, Y. Yamada, A. Taketani, Hisaya Kurashige, Y. Noguchi, Shigeki Mori, Y. Chiba, Tachishige Hirose, Y. Asano, Y. Suzuki, Y. Nagashima, Y. Hoshi, Yasuhiro Homma, Nobuyuki Kanematsu, F. Suekane, K. Amako, T. Matsui, Toru Tsuboyama, R. Tanaka, M. Wake, N. Tamura, T. Yamashita, M. Wakai, Kozo Miyake, Shigeru Odaka, M. Sakano, H. Osabe, T. Sumiyoshi, Herbert Friedrich Boerner, Masami Chiba, Fumihiko Takasaki, H. Saito, N. Sasao, Tsuneo Emura, J. Shirai, Y. Teramoto, T. Yamagata, Y. Nakagawa, S. Sugimoto, S. Sakamoto, Hiroshi Sakamoto, K. Kubo, H. Sakae, T. Kondo, Masato Higuchi, Keijiro Tobimatsu, I. Nakano, H. Yoshida, Mineo Fukawa, Motoyuki Sato, J. Haba, K. Ogawa, T. Koseki, Yasuo Hemmi, Takashi Nakamura, S. Uehara, Y. Arai, T. Watanabe, and Yoshinobu Unno

Subjects
Systematic error, Nuclear physics, Physics, Quark, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Nuclear Experiment
Abstract

The total cross section for the process of the e+e- annihilation into hadrons has been measured at the centre-of-mass energies of 50 GeV and 52 GeV and a search has been made for new heavy quarks. The ratios R = σ(e+e- → hadrons)/σpoint(e+e- → μ+μ-) obtained are 4.4±0.5 at 50 GeV and 4.7±0.3 at 52 GeV, respectively. An additional systematic uncertainty is 10%. From the event shape analysis we found no evidence for a new quark with charge 2 3 e .

Published
1987

17. Study of multihadron events with isolated leptons in e+e− annihilation at

Author

M. Wakai, Y. Hoshi, Toru Fukui, T. Sumiyoshi, Nobuyuki Kanematsu, T. Koseki, Ichita Endo, A. Tsukamoto, Y. Asano, Koji Abe, D. Haidt, Yasuo Hemmi, Y. Chiba, Ryusaburo Kikuchi, S. Uehara, Hiroshi Sakamoto, Y. Takada, Y. Arai, Y. Yamada, M. Sato, Masami Chiba, Taro Ohama, Motomasa Daigo, F. Suekane, H. Osabe, Teruo Nakamura, Tachishige Hirose, Fumihiko Takasaki, Keisuke Maehata, T. Watanabe, T. Yamashita, M. Shioden, J. Haba, Toru Tsuboyama, Masato Higuchi, Y. Ikegami, Tsuneo Emura, K. Ogawa, Makoto Sakuda, Kozo Miyake, J. Shirai, T. Kamitani, T. Ohsugi, M. Minami, H. Sakae, Yoshinobu Unno, R. Tanaka, N. Tamura, A. Ono, Y. Hojyo, Yoshishige Suzuki, K. Kubo, K. Amako, M. Sakano, I. Nakano, H. Saito, Keijiro Tobimatsu, Hisaya Kurashige, S. Sugimoto, N. Sasao, Shigeki Mori, T. Yamagata, Yoshiyuki Watase, H. Yoshida, Yasuhiro Homma, M. Wake, T. Matsui, Y. Nagashima, Nobuhiro Ishihara, T. Kondo, S. Sakamoto, Mineo Fukawa, Yasutaka Fukushima, I. Hayashibara, Junichi Kanzaki, and A. Taketani

Subjects
Quark, Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Muon, Annihilation, Physics::Instrumentation and Detectors, High Energy Physics::Phenomenology, Electron, JADE (particle detector), Nuclear physics, High Energy Physics::Experiment, Anomaly (physics), Lepton
Abstract

We have studied inclusive lepton production in e + e − annihilations into multihadrons in the energy range between √ s =50 and 55 GeV using the VENUS detector at TRISTAN, KEK. Though MARK-J and JADE groups at PETRA found an excess of isolated muon events at √ s ⩾46.3 GeV, we have not observed such an anomaly in muon nor in electron production. The observed rates of isolated leptons are consistent with the production and decay of five known quarks.

Published
1988

18. A search for excited electrons in the e+e− reactions up to the √s of 56 GeV

Author

Y. Asano, Keijiro Tobimatsu, T. Ohsugi, K. Kubo, Toru Fukui, Y. Hojyo, Y. Ikegami, Teruo Nakamura, A. Tsukamoto, Tachishige Hirose, Makoto Sakuda, Toru Tsuboyama, Masato Higuchi, F. Suekane, Yasutaka Fukushima, Kozo Miyake, Tsuneo Emura, Shigeru Odaka, R. Tanaka, N. Tamura, M. Sato, J. Shirai, T. Kondo, Y. Chiba, Junichi Kanzaki, A. Taketani, Ryusaburo Kikuchi, T. Yamashita, J. Haba, Yoshishige Suzuki, K. Ogawa, Nobuhiro Ishihara, N. Sasao, T. Yamagata, K. Amako, I. Hayashibara, Y. Yamada, D. Haidt, T. Koseki, Hisaya Kurashige, Yasuo Hemmi, S. Uehara, Shigeki Mori, Yasuhiro Homma, I. Nakano, Y. Takada, Y. Hoshi, H. Yoshida, M. Minami, Nobuyuki Kanematsu, Masami Chiba, A. Ono, Taro Ohama, Motomasa Daigo, T. Kamitani, Y. Nagashima, H. Sakae, M. Wakai, T. Sumiyoshi, Y. Arai, Koji Abe, T. Watanabe, Yoshinobu Unno, S. Sakamoto, H. Osabe, Fumihiko Takasaki, Mineo Fukawa, Ichita Endo, M. Sakano, H. Saito, M. Shioden, S. Sugimoto, Yoshiyuki Watase, T. Matsui, and Hiroshi Sakamoto

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Angular distribution, Coupling strength, Excited state, Compton scattering, Lower limit
Abstract

Excited electrons, e ∗' s, have been searched for by making use of the processes e + e − →e + e − γγ and e γ ( e ) (quasi-real Compton scattering). From the former process, we have obtained the lower limit for the mass of e ∗' , 27.9 GeV/ c . A good agreement with QED is observed in the latter process, and new upper limits have been set for the coupling strength λ as a function of the mass of e ∗ .

Published
1988

19. A new method to investigate the nuclear effect in leptonic interactions

Author

T. Kitagaki, E. Hafen, Y. C. Du, A. Desilva, S. Fukui, T. Takayama, Shoji Tanaka, W. M. Bugg, E. D. Alyea, S. Wang, Y. Hoshi, T. Nakajima, D. H. Brick, Masato Higuchi, L. G. Mu, H. Hanada, K. Hasegawa, T. Yamamura, E. L. Hart, M. Sasaki, G. T. Condo, I. A. Pless, S. W. Xu, Akira Yamaguchi, K. Numano, A. Chen, Kaushik De, J. Katayama, N. Gelfand, H. J. Hargis, D. Goloskie, J. Harton, Y. Wu, T. Akagi, K. Tamai, J. Shimony, H. Kurino, K. Tamae, T. Handler, M. Zhao, R. Kroeger, Y. Chiba, Hiroshi Suzuki, J. E. Brau, A.M. Shapiro, K. Furuno, Y. Morita, M. Widgoff, Y. S. Tai, M. Aryal, S. W. Mao, T. Murphy, S. Nakai, H. O. Cohn, P. Allen, R. Majoras, and M. Sato

Subjects
Quark, Physics, Nuclear physics, Nuclear and High Energy Physics, High energy, Particle physics, Nuclear Theory, Interaction model, Liquid bubble, Neutrino, Nucleon, Charged current
Abstract

High energy neutrino interactions in a heavy liquid bubble chamber were classified by the presence or absence of dark tracks (stubs) at the interaction vertices. Quark distributions, σ ( x ), were compared in the two groups of data. Those with dark tracks, presumably indicative of an interaction with a deeply bound nucleon, show an enhanced nuclear effect.

Published
1988

20. Charge asymmetry of hadron jets and limits on the compositeness scales in the e+e−→qq̄ reaction at 〈√s〉 = 57.6 GeV

Author

A. Ono, A. Tsukamoto, H. Yoshida, Nobuhiro Ishihara, Y. Ikegami, Tachishige Hirose, M. Sato, Yoshiyuki Watase, Y. Takada, Y. Asano, N. Terunuma, S. Sakamoto, Hisaya Kurashige, T. Ohsugi, Tsuneo Emura, Masami Chiba, Taro Ohama, Yasushige Yonezawa, A. Taketani, Y. Hojyo, J. Shirai, Ichita Endo, S. Shirakata, Motomasa Daigo, Y. Chiba, T. Kamitani, N. Sasao, T. Matsui, Yasuhiro Homma, Makoto Sakuda, K. Kubo, F. Yabuki, T. Yamagata, R. Tanaka, Y. Yamada, S. Suzuki, M. Sakano, Shigeki Mori, Teruo Nakamura, T. Yamashita, N. Tamura, Yasutaka Fukushima, H. Saito, Junichi Kanzaki, M. Shioden, Toru Tsuboyama, Kozo Miyake, H. Sakae, F. Suekane, Ryusaburo Kikuchi, Shigeru Odaka, Yoshishige Suzuki, M. Wakai, S. Sugimoto, D. Haidt, T. Sumiyoshi, Hiroshi Sakamoto, Yasuo Hemmi, T. Oyama, Mineo Fukawa, H. Osabe, S. Uehara, Fumihiko Takasaki, K. Amako, Koji Abe, Toru Fukui, A. Okamoto, K. Tobimatsu, Masato Higuchi, Y. Nagashima, I. Hayashibara, T. Kondo, J. Haba, M. Takita, K. Ogawa, Y. Narita, Y. Arai, T. Watanabe, Yoshinobu Unno, I. Nakano, M. Utsumi, Y. Hoshi, Nobuyuki Kanematsu, T. Koseki, and M. Minami

Subjects
Scattering cross-section, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, media_common.quotation_subject, Electron–positron annihilation, Hadron, Electroweak interaction, Charge (physics), Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, media_common
Abstract

A charge asymmetry has been measured in hadron jets from e + e − annihilation at energies between 52 and 61.4 geV (〈√ s 〉=57.6 GeV). The measured asymmetry is A =11.4%±2.2%±2.1% and is consistent with the prediction of the standard model of the electroweak theory. By using the differential cross section, lower limits of the compositeness scale in eeqq contact interactions have been determined to be typically a few TeV at 95% CL.

Published
1989

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