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18 results on '"Shiro SUZUKI"'

1. Measurement of the inclusive cross section of jets in γγ interactions at TRISTAN

Author

T. Nagira, K. Miyabayashi, K. Emi, A. Yamaguchi, T. Takahashi, M. Aoki, Shiro Suzuki, K. Abe, F. Teramae, H. Hayashii, A. Yamamoto, T. Toyama, F. Ochiai, N. Toomi, M. Iwasaki, E. Nakano, T. Abe, I. Levine, Toru Tanimori, T. Shinohara, Y. Ohnishi, N. Fujiwara, T. Tsukamoto, K. Takahashi, R. Itoh, T. Tauchi, Masakazu Kobayashi, S. Awa, H. Kichimi, R. Kajikawa, K. Muramatsu, Hideki Okuno, K. Shimozawa, A. Sugiyama, K. Nakabayashi, Koichi Nagai, B. Howell, A. Miyamoto, Ryoji Enomoto, S. Uno, H. Fujii, S. Kato, Hiroyuki Iwasaki, K. Fujita, Y. Watanabe, J. Fujimoto, S. Noguchi, Hirokazu Ikeda, R. Belusevic, N. Sugiyama, T. Fujii, S. Kawabata, Osamu Nitoh, T. Okusawa, D.S. Koltick, N. Iida, I. Adachi, M. Takemoto, Keisuke Fujii, M. Yamauchi, and Y. Teramoto

Subjects
Cone algorithm, Physics, Nuclear and High Energy Physics, Particle physics, Jet (fluid), Photon, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Photon structure function, law.invention, Nuclear physics, Cross section (physics), law, Energy flow, High Energy Physics::Experiment, Collider
Abstract

We have investigated the properties of jet production in almost real γγ collisions at √s=58 GeV with the TOPAZ detector at the TRISTAN e+e− collider. The data were analyzed with a jet-clustering method based on a cone algorithm. The jet rate shows evidence for a hard scattering effect of the hadronic constituents of a photon (resolved photon processes). We have also observed a substantial energy flow in the small-angle region, which is additional evidence for resolved photon processes. We present the transverse momentum dependence of the inclusive jet and two-jet cross sections and compare them with different model predictions.

Published
1993
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2. Evidence for two JP = 2− strange meson states in the K2 (1770) region

Author

F. Bird, P.K. Sinervo, C.O. Pak, S. H. Williams, N. Toge, T. Tauchi, B. T. Meadows, H. Hayashii, Shiro Suzuki, G. Tarnopolsky, D.C. Schultz, W.B. Johnson, Kumataro Ukai, P. Kunz, D. Aston, D. W. G. S. Leith, S. L. Shapiro, T. Bienz, A. P. Waite, J. Martinez, S. Iwata, B. N. Ratcliff, W. Dunwoodie, H. Ozaki, N. Awaji, A. Sugiyama, T. Matsui, A. Miyamoto, M. Nussbaum, R. Kajikawa, R. Endorf, K. Fujii, P.E. Rensing, L. Levinson, Yeong-Dae Kwon, T. Shimomura, and J. D'Amore

Subjects
Nuclear physics, Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Spectrometer, Partial wave analysis, Particle interaction, Mass spectrum
Abstract

Evidence is presented for two J P =2 − strange mesons; one at ∼ 1.77 GeV/ c 2 and the other at ∼ 1.82 GeV/ c 2 . These states have been observed in a partial wave analysis of the Kω system in the reaction K − p → K − π + π − π 0 p where the strange mesons decay into K − ω and the ω then decays to π + π − π 0 . The data set contains ∼ 10 5 Kωp events at 11 GeV/ c taken by the LASS spectrometer at SLAC.

Published
1993
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3. Search for a narrow resonance in e+e− collisions between ECM = 58 and 60 GeV

Author

K. Shimozawa, A. Yamaguchi, Makoto Kobayashi, M. Iwasaki, O. Nitoh, S. Kawabata, Toru Tanimori, Iki Adachi, T. Tsukamoto, T. Kishida, N. Fujiwara, Hirokazu Ikeda, T. Nagira, J. Fujimoto, E. Nakano, K. Nakabayashi, R. Belusevic, T. Takahashi, F. Ochiai, B. Howell, T. Okusawa, Y. Watanabe, H. Kichimi, M. Takemoto, Keisuke Fujii, K. Abe, K. Miyabayashi, S. Yamamoto, I. Levine, Y. Ohnishi, Shiro Suzuki, D.S. Koltick, Koichi Nagai, N. Iida, S. Awa, R. Kajikawa, N. Sugiyama, Masato Aoki, A. Sugiyama, Toshiaki Tauchi, S. Noguchi, R. Itoh, N. Toomi, Hiroshi G. Okuno, Y. Teramoto, A. Miyamoto, Ryoji Enomoto, S. Uno, Hiroyuki Iwasaki, T. Shinohara, S. Kato, K. Muramutsu, K. Emi, F. Teramae, K. Takahashi, T. Toyama, H. Fujii, K. Fujita, Toshitsugu Fujii, M. Yamauchi, Akira Yamamoto, and H. Hayashii

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Scalar (mathematics), Resonance, law.invention, Standard Model, Nuclear physics, law, High Energy Physics::Experiment, Tensor, Collider, Energy (signal processing)
Abstract

We carried out the energy scan between ECM = 58 and 60 GeV at the TRISTAN e+e− collider to search for the possible narrow resonance suggested by the L3 experiment at LEP. The total cross sections are measured for γγ, multihadron, e+e− and μ + μ− production at ten energy points covering this energy range almost uniformly. The results are in good agreement with the Standard Model predictions, and 95% confidence level upper limits are set to Γee × BR of the hypothetical scalar and tensor resonances.

Published
1993
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4. Cross sections and charge asymmetries for e+e−→μ+μ− and e+e−→τ+τ−reactions at

Author

Makoto Kobayashi, S. Kato, Toshitsugu Fujii, E. Sakai, K. Emi, Tomohiro Abe, M. Yamauchi, Akira Yamamoto, A. Shimonaka, Shiro Suzuki, K. Miyabayashi, Koichi Nagai, I. Levine, O. Nitoh, F. Teramae, Akiya Miyamoto, T. Toyama, Y. Ohnishi, T. Kishida, Ryoji Enomoto, Michael Doser, F. Ochiaj, M. Takemoto, K. Harigae, Junpei Fujimoto, N. Fujiwara, Keisuke Fujii, T. Tsukamoto, Hirokazu Ikeda, R. Rajikawa, A. Shirahashi, Hideki Okuno, M. Iwasaki, Masato Aoki, T. Nagira, T. Takahashi, N. Sugiyama, Toru Tanimori, Minoru Nakayama, Y. Teramoto, K. Shimozawa, A. Sugiyama, Toshiaki Tauchi, H. Hayashii, R. Itoh, B. Howell, R. Belusevic, H. Fujii, K. Muramatsu, S. Noguchi, Y. Watanabe, H. Kichimi, N. Tachibana, E. Nakano, S. Yamamoto, S. Uno, Hiroyuki Iwasaki, I. Adachi, Naoko Iida, D.S. Koltick, S. Kawabata, T. Okusawa, and K. Takahashi

Subjects
Physics, Nuclear physics, Topaz, Nuclear and High Energy Physics, Range (particle radiation), Luminosity (scattering theory), Electron–positron annihilation, engineering, Charge (physics), engineering.material, Pseudovector, Standard Model, Lepton
Abstract

The process e+e−→μ+μ−and e+e− have been studied in the energy range s=52−61.4 GeV, using the TOPAZ detector at TRISTAN. From an integrated luminosity of L = 74.0 pb−1, lowest-order cross sections and forward-backward asymmetries are measured to be 〈σμμ〈 = 25.4±0.9±1.2 pb, 〈Aμμ〉 = (−32.2±3.1±1.1)%, 〈σττ〉 = 27.1±1.1±1.2 pb, 〈Aττ〉 = (−33.9±4.9±1.0)% , at an average energy of s〉=57.87 GeV. From the measured assymetry we derive axial vector couplings of acaμ=0.96±0.09±0.01,and acaτ=1.01±0.14±0.01±. These results are consistent with standard model expectations. Lower limits in the range 2–5 TeV (95%CL)are placed on compositeness scale parameters for leptons.

Published
1992
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5. Studies of e+e−→γγ and γγγ reactions

Author

K. Harigae, H. Iwasaki, J. Fujimoto, R. Kajikawa, Shiro Suzuki, K. Muramatsu, N. Iida, R. Itoh, T. Tsukamoto, K. Shimozawa, Toru Tanimori, N. Fujiwara, Koichi Nagai, A. Miyamoto, M. Ohkura, T. Takahashi, T. Nagira, Shimpei Yamamoto, S. Noguchi, S. Uno, N. Tachibana, K. Takahashi, T. Tauchi, A. Shimonaka, H. Takamure, A. Shirahashi, A. Sugiyama, Masakazu Kobayashi, Hideki Okuno, Keisuke Fujii, I. Adachi, K. Miyabayashi, H. Nishioka, T. Abe, E. Sakai, Akira Yamamoto, Y. Watanabe, B. Howell, S. Kawabata, E. Nakano, Shigeaki Kato, Y. Kato, I. Levine, Y. Ohnishi, M. Doser, Osamu Nitoh, T. Kamae, F. Ochiai, H. Fujii, Ryoji Enomoto, H. Kichimi, Y. Teramoto, D.S. Koltick, N. Fujio, T. Okusawa, T. Kishida, Hirokazu Ikeda, N. Nakagawa, M. Nakajima, M. Yamauchi, Minoru Nakayama, T. Fujii, S. Hori, and H. Hayashii

Subjects
Massless particle, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Effective mass (solid-state physics), Annihilation, Electron–positron annihilation, Mass spectrum, Elementary particle, Spectral line, Boson
Abstract

We have measured the cross section for γγ production with the TOPAZ detector in the energy region √ s =50.0–61.4 GeV. The observed cross section for γγ production integrated over |cos θ | ⩽ 0.77 is 50.2±0.8±2.2 pb at 〈√ s 〉=57.6 GeV and the ratio of this value to the QED prediction is 1.01±0.02±0.04. The angular distribution is in good agreement with the QED predictions, thereby setting limits on the compositeness scales, Λ L+R + =168 GeV, Λ L+R − =97 GeV, Λ L,R =141 GeV, Λ L,R − =81 GeV, and Λ L−R ± =68 GeV, at the 95% confidence level. The reaction e + e − → γγγ was also studied and was found consistent with the QED prediction.

Published
1992
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6. An experimental study of muon pair production in tagged two-photon interactions

Author

Ryoji Enomoto, Minoru Nakayama, Y. Teramoto, A. Miyamoto, T. Kishida, S. Kawabata, Hirokazu Ikeda, Makoto Kobayashi, H. Takamure, K. Harigae, T. Nagira, S. Noguchi, T. Abe, N. Fujio, S. Kato, N. Fujiwara, Keisuke Fujii, I. Adachi, B. Howell, Toru Tanimori, M. Nakajima, K. Miyabayashi, K. Shimozawa, T. Okusawa, Koichi Nagai, H. Fujii, H. Hayashii, A. Shimonaka, E. Sakai, S. Hori, T. Takahashi, Y. Watanabe, H. Kichimi, K. Takahashi, J. Fujimoto, N. Tachibana, N. Nakagawa, D.S. Koltick, H. Nishioka, Shiro Suzuki, A. Sugiyama, Toshiaki Tauchi, M. Doser, Y. Kato, Toshitsugu Fujii, Hiroshi G. Okuno, I. Levine, M. Yamauchi, Akira Yamamoto, Y. Ohnishi, R. Kajikawa, K. Muramatsu, M. Ohkura, T. Tsukamoto, E. Nakano, A. Shirahashi, S. Uno, T. Kamae, Hiroyuki Iwasaki, S. Yamamoto, N. Iida, R. Itoh, F. Ochiai, and O. Nitoh

Subjects
Physics, Nuclear reaction, Nuclear physics, Nuclear and High Energy Physics, Antiparticle, Pair production, Muon, Luminosity (scattering theory), Antimatter, Mass spectrum, High Energy Physics::Experiment, Lepton
Abstract

The process e + e − →e + e − μ + μ − has been studied in single-tag and double-tag configurations using the TOPAZ detector at TRISTAN. The data correspond to the integrated luminosity of 45.3pb − at center-of-mass energies ranging from 52 to 61.4 GeV. The observed events in both configurations have shown a good agreement with QED predictions in order α 4 . Although the AMY group reported an excess of e + e − →e + e − μ + μ − events in double-tag mode at low muon invariant mass region less than 1.0 GeV/c 2 , we did not observed such excess in our data.

Published
1992
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7. Experimental study of b-quark jets in e+e− annihilation at TRISTAN

Author

E. Sakai, Y. Kato, I. Levine, M. Ohkura, T. Tsukamoto, A. Shirahashi, Hideki Okuno, S. Noguchi, Toru Tanimori, Shiro Suzuki, Akira Yamamoto, T. Tauchi, H. Takamure, Masakazu Kobayashi, Y. Teramoto, H. Fujii, K. Harigae, H. Hayashii, Minoru Nakayama, T. Fujii, S. Uno, Koichi Nagai, N. Iida, J. Fujimoto, T. Kishida, R. Itoh, K. Takahashi, T. Nagira, Hirokazu Ikeda, T. Ohnishi, M. Doser, K. Shimozawa, I. Adachi, Y. Watanabe, A. Shimonaka, N. Fujio, T. Abe, T. Takahashi, S. Yamamoto, D.S. Koltick, N. Tachibana, H. Nishioka, N. Nakagawa, Ryoji Enomoto, S. Kawabata, E. Nakano, S. Kato, Osamu Nitoh, B. Howell, T. Kamae, H. Kichimi, F. Ochiai, R. Kajikawa, A. Miyamoto, K. Muramatsu, Hiroyuki Iwasaki, Keisuke Fujii, A. Sugiyama, N. Fujiwara, T. Okusawa, K. Miyabayashi, M. Nakajima, M. Yamauchi, and S. Hori

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Astrophysics::High Energy Astrophysical Phenomena, Bottom quark, Charged particle, Nuclear physics, Pair production, Physics::Accelerator Physics, High Energy Physics::Experiment, B meson, Rapidity, Lepton
Abstract

An experimental study of b-quark jets using high-pT electrons was carried out at √s=58 GeV with the TOPAZ detector at the e+e− collider TRISTAN at KEK. The forward-backward charge asymmetry of the b-quark was obtained to be A b b =−0.55±0.27( stat. )±0.07( syst. ) , consistent with the standard model prediction. Also, such jet properties of the b-quark as the average charged multiplicity and the rapidity of charged particles were analyzed. In order to purify the b-quark event samples in this analysis, only events with backward-going electrons or forward-going positrons were used. The energy dependence of these jet properties was studied by making comparisons with the results of the DELCO experiment at the PEP collider (√s=29 GeV) at SLAC.

Published
1992
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8. Measurements of b-quark forward-backward charge asymmetry and axial-vector coupling using inclusive muons in e+e− annihilation at

Author

Akira Yamamoto, Shiro Suzuki, K. Kurata, T. Okusawa, M. Ohkura, Toru Tanimori, Masakazu Kobayashi, Shimpei Yamamoto, S. Kawabata, Iki Adachi, K. Harigae, Osamu Nitoh, N. Iida, H. Fujii, Akiya Miyamoto, A. Shimonaka, Michael Doser, A. Shirahashi, S. Uno, Junpei Fujimoto, T. Kamae, H. Hayashii, Y. X. Watanabe, R. Itoh, N. Fujio, Toshitsugu Fujii, A. Sugiyama, Toshiaki Tauchi, R. Kajikawa, Hiroshi G. Okuno, Ryoji Enomoto, T. Takahashi, Tomohiro Abe, K. Muramatsu, Hiroyuki Iwasaki, T. Tachibana, H. Nishioka, M. Nakajima, M. Yamauchi, E. Nakano, S. Hori, K. Shimozawa, D.S. Koltick, K. Takahashi, H. Kichimi, F. Ochiai, K. Miyabayashi, N. Fujiwara, Minoru Nakayama, Y. Teramoto, N. Nakagawa, S. Noguchi, E. Sakai, T. Kishida, T. Nagira, Hirokazu Ikeda, Y. Kato, I. Levine, T. Tsukamoto, Y. Ohnishi, Shigeaki Kato, B. Howell, Koichi Nagai, Keisuke Fujii, and H. Takamure

Subjects
Coupling constant, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Muon, Meson, Electron–positron annihilation, Astrophysics::Cosmology and Extragalactic Astrophysics, Bottom quark, Nuclear physics, Pair production, High Energy Physics::Experiment, B meson, Nuclear Experiment, Astrophysics::Galaxy Astrophysics
Abstract

We have collected 122 multi-hadronic inclusive muon events with the TOPAZ detector at 〈s〉 = 58.27 GeV with ∫Ldt=40.61 pb−1. From this event sample we derived the differential cross section for B-hadron productions and determined B-hadron forward-backward asymmetry (Abb) to be Abb = −0.71 ± 0.34 (stat)+0.07−0.08(syst). A fit to the differential cross section, after correcting for the effect of B0B0 mixing, yielded the axial-vector coupling constant of the b-quark (ab):ab = −1.79+0.34−0.32(stat)+0.15−0.14(syst). We also set a 90% confidence level limit of χ

Published
1991
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9. Charge asymmetry of hadronic events in e+e− annihilation at √s=57.9 GeV

Author

Shiro Suzuki, A. Shimonaka, S. Kawabata, M. Doser, R. Itoh, R. Sugahara, Osamu Nitoh, M. Ohkura, A. Maruyama, H. Takamure, S. Uno, Toru Tanimori, T. Takahashi, K. Kurata, K. Iwashiro, K. Shimozawa, B. Howell, Keisuke Fujii, N. Nakajima, N. Fujio, Y. Watanabe, Terushige Fujii, K. Takahashi, Shimpei Yamamoto, Y. Kato, N. Fujiwara, T. Tauchi, Masakazu Kobayashi, I. Levine, F. Ochiai, T. Okusawa, K. Matsushita, Y. Yoake, T. Nagira, A. Imanishi, N. Iida, Ryoji Enomoto, T. Kamae, A. Shirahashi, H. Nishioka, Hiroshi G. Okuno, S. Onodera, T. Ishii, K. Muramatsu, M. Yamauchi, T. Kishida, S. Noguchi, D.S. Koltick, S. Hori, Hirokazu Ikeda, T. Tsukamoto, N. Nakagawa, M. Anazawa, A. Sugiyama, J. Yoshizawa, I. Adachi, Akira Yamamoto, J. Fujimoto, Y. Teramoto, Shigeaki Kato, Koichi Nagai, H. Fujii, H. Kichimi, R. Kajikawa, A. Miyamoto, K. Maruyama, Hiroyuki Iwasaki, and H. Hayashii

Subjects
Quark, Coupling constant, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, media_common.quotation_subject, High Energy Physics::Phenomenology, Hadron, Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Astrophysics::Galaxy Astrophysics, media_common, Lepton
Abstract

著者人数：70名, 資料番号: SA1002290000

Published
1991
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10. A search for A b′ quark with flavor changing neutral current decay modes at TRISTAN

Author

Akira Yamamoto, Y. Teramoto, M. Yamauchi, A. Shimonaka, T. Takahashi, A. Imanishi, Shimpei Yamamoto, Koichi Nagai, F. Ochiai, K. Fujiwara, A. Shirahashi, K. Shimozawa, S. Onodera, Y. Kayahara, Hiroyuki Iwasaki, T. Fujii, Shiro Suzuki, J. Yoshizawa, D.S. Koltick, S. Higashi, S. Kawabata, N. Fujiwara, Osamu Nitoh, N. Sasayama, A. Maruyama, Keisuke Fujii, S. Yamashita, T. Tsukamoto, R. Itoh, R. Sugahara, Hiroaki Aihara, S. Uno, H. Ozaki, A. Sugiyama, Kumataro Ukai, N. Kusuki, T. Nagira, K. Iwashiro, Y. Kato, I. Levine, S. Noguchi, K. Matsushita, T. Okusawa, H. Fujii, B. Howell, Ryoji Enomoto, Hiroshi G. Okuno, A. Miyamoto, H. Ikeda, Y. Yoake, N. Iida, K. Maruyama, R. Kajikawa, M. Doser, K. Muramatsu, K. Takahashi, H. Takamure, T. Kamae, T. Tauchi, Y. Watanabe, Masakazu Kobayashi, H. Kichimi, H. Hayashii, J. Fujimoto, I. Adachi, S. Kato, T. Ishii, and T. Kishida

Subjects
Quark, Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Branching fraction, Flavor-changing neutral current, High Energy Physics::Phenomenology, Bottom quark, Nuclear physics, Particle decay, Pair production, High Energy Physics::Experiment, Invariant mass
Abstract

A search for the b′ quark via flavour changing neutral current (FCNC) decay modes is described. The search was carried out by looking for isolated high energy photon(s) or back to back jet pairs within 4-jet topologies using the data taken by the TOPAZ detector at TRISTAN in the energy range s=50.0−60.8 GeV. As the FCNC decay branching ratio of the b′ is unknown, the experimental limits are given as a function of mass and branching ratio. Assuming the branching ration of the FCNC mode is 100%, a mass limit for b′ is set ⩾28.3 GeV/c2 independent of Br(b′→bγ).

Published
1990
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11. Spin-parity determination of the φJ(1850) from K−p interactions at 11 GeV/c

Author

R. Endorf, K. Fujii, A. Miyamoto, H. Ozaki, N. Awaji, T. Bienz, W. Dunwoodie, A. P. Waite, R. Kajikawa, W.B. Johnson, T. Shimomura, L. Levinson, S. Iwata, P.K. Sinervo, P. Kunz, S. L. Shapiro, S. H. Williams, N. Toge, H. Hayashii, G. Tarnopolsky, J. D'Amore, F. Bird, Shiro Suzuki, D.C. Schultz, D. Aston, A. Sugiyama, Kumataro Ukai, C.O. Pak, T. Tauchi, B. T. Meadows, D. W. G. S. Leith, T. Matsui, B. N. Ratcliff, and M. Nussbaum

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Pair production, Meson, Hadron, G-parity, Hyperon, Lambda baryon, Quantum number
Abstract

High statistics data from the reactions K−p→K−K+Λ and K−p→Ks0K±π∓Λ at 11 GeV/c have been obtained in the LASS spectrometer at SLAC. Spherical harmonic moment and amplitude analyses of the K−K+ system confirm the existence of the φJ(1850) and demonstrate that its quantum numbers are IG(JPC)=0−(3−−). Evidence for a K∗ K (+c.c.) decay mode is also presented.

Published
1988
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12. Observation of the selective coupling of K* states to the K−η channel

Author

A. P. Waite, S. Iwata, D. W. G. S. Leith, C.O. Pak, P.K. Sinervo, L. Levinson, Shiro Suzuki, W.B. Johnson, J. D'Amore, T. Shimomura, S. L. Shapiro, D.C. Schultz, T. Matsui, D. Aston, T. Bienz, N. Awaji, G. Tarnopolsky, W. Dunwoodie, P. Kunz, T. Tauchi, S. H. Williams, N. Toge, H. Hayashii, F. Bird, B. T. Meadows, H. Ozaki, Kumataro Ukai, B. N. Ratcliff, A. Sugiyama, M. Nussbaum, A. Miyamoto, R. Endorf, K. Fujii, and R. Kajikawa

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Particle decay, Pair production, Effective mass (solid-state physics), Branching fraction, Hadron, Mass spectrum, Atomic physics, Nucleon
Abstract

The K−η effective mass spectrum in the reaction K−p→K−π+π−π0p at 11 GeV/c has a prominent peak at ≈1.75 GeV/c2, which is shown to be due to the K3∗(1780) by a spherical harmonic moments analysis and amplitude decomposition; there is no significant signal for K2∗(1430). The measured branching fractions for the leading L=1 and L=2 K∗,s, [BF(K2∗ (1430)→Kη) BF ( K 3 ∗ (1780)→ Kη )=9.4±3.4%] confirm the SU(3) prediction that the Kη channel couples preferentially to odd spin K*,s.

Published
1988
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13. Measurement of the processes e+e−→e+e− and e+e−→γγ at

Author

Akiya Miyamoto, Tadayuki Takahashi, T. Okusawa, T. Morimoto, S. Iwata, N. Fujiwara, A. Shirahashi, O. Yamakawa, H. Iwasaki, Y. X. Watanabe, S. Kawabata, Y. Teramoto, T. Suwada, A. Maruyama, H. B. Dijkstra, T. Ishii, J. Shimonaka, T. Ohshima, J. Fujimoto, Ryuhei Sugahara, T. Kishida, S. Kuroda, R. Enomoto, F. Ochiai, T. Tanaka, R. Kajikawa, A. Imanishi, A. Sugiyama, Toshiaki Tauchi, Tomohiro Matsuda, H. Takamure, S. Uno, Hideki Okuno, Toru Sato, N. Iida, O. Nitoh, S. Noguchi, Shiro Suzuki, H. Hayashii, S. Higashi, Terushige Fujii, S. Kato, T. Tsukamoto, K. Shimozawa, H. Kichimi, K. Nakamura, H. Masuda, K. Maruyama, Fuminori Sai, Kumataro Ukai, K. Takahashi, M. Yoshioka, Makoto Kobayashi, N. Kusuki, S. Yamamoto, M. Yamauchi, Akira Yamamoto, I. Adachi, Y. Yoshimura, H. Ikeda, T. Kamae, H. Ozaki, H. Aihara, K. Fujii, S. Yamashita, R. Itoh, and H. Fujii

Subjects
Physics, Elastic scattering, Nuclear and High Energy Physics, Particle physics, Antiparticle, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Elementary particle, Nuclear physics, Antimatter, High Energy Physics::Experiment, Nuclear Experiment, Bhabha scattering, Lepton
Abstract

Differential cross sections for the processes e + e − → e + e − (Bhabha scattering) and e + e − → γγ have been measured with the TOPAZ detector at s =52 GeV . The results agree with the predictions of quantum electrodynamics (QED). The lower limits for the QED cut-off parameters have been obtained to be Λ + ⩾115 GeV and Λ − ⩾236 GeV for Bhabha scattering, and Λ + ⩾94 GeV and Λ − ⩾59 GeV for the reaction e + e − → γγ .

Published
1988
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14. Evidence for A from K−p interactions at 11 GeV/c

Author

S. H. Williams, N. Toge, H. Hayashii, Kumataro Ukai, T. Matsui, T. Bienz, W. Dunwoodie, W.B. Johnson, S. L. Shapiro, B. T. Meadows, T. Shimomura, Shiro Suzuki, G. Tarnopolsky, P.K. Sinervo, B. N. Ratcliff, N. Awaji, R. Kajikawa, R. Endorf, L. Levinson, H. Ozaki, F. Bird, A. Sugiyama, K. Fujii, D.C. Schultz, D. Aston, M. Nussbaum, A. Miyamoto, P. Kunz, T. Tauchi, C.O. Pak, J. D'Amore, D. W. G. S. Leith, A. P. Waite, and S. Iwata

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Pair production, Meson, Hadron, G-parity, Mass spectrum, Dalitz plot, Lambda baryon
Abstract

Data from the reaction K − p→K − K + Λ at 11 GeV/ c have been obtained in the LASS spectrometer at SLAC. A spherical harmonic moments analysis of the K − K + system provides evidence for a rather narrow J PC =4 ++ state at ∼2.2 GeV/ c 2 . Relevant data from the reaction K − p →K 0 s K 0 s Λ in the present experiment are shown also, and comparisons made to results from MARK III and GAMS in this mass region.

Published
1988
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15. Observation of a new at in K-p interactions at

Author

B. N. Ratcliff, Kumataro Ukai, T. Bienz, W. Dunwoodie, W.B. Johnson, D.C. Schultz, G. Tarnopolsky, D. Aston, P.K. Sinervo, L. Levinson, S. L. Shapiro, Shiro Suzuki, A. Miyamoto, C.O. Pak, D. W. G. S. Leith, F. Bird, N. Awaji, A. Sugiyama, S. H. Williams, N. Toge, H. Hayashii, A. P. Waite, M. Nussbaum, S. Iwata, J. D'Amore, R. Kajikawa, H. Ozaki, R. Endorf, B. T. Meadows, T. Matsui, K. Fujii, T. Tauchi, P. Kunz, and T. Shimomura

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Cross section (physics), State (functional analysis), Atomic physics, Resonance (particle physics)
Abstract

Clear evidence is presented for an Ω ∗− resonance of mass 2474±12 MeV c 2 and width 72±33 MeV c 2 in K−p interactions at 11 GeV c . The state is observed in the Ω−π+π− decay mode, and the corresponding inclusive cross section, corrected for Ω − π 0 π 0 decay, is estimated to be 290±90 nb.

Published
1988
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16. Observation of the leading K∗ L-excitation series from JP = 1− through 5− in the reaction K− p → K− π+ n AT 11 GeV/c

Author

Kumataro Ukai, L. Levinson, D.C. Schultz, D. Aston, G. Tarnopolsky, T. Shimomura, R. Kajikawa, W.B. Johnson, Shiro Suzuki, A. P. Waite, S. Iwata, N. Awaji, S. L. Shapiro, B. T. Meadows, S. H. Williams, C.O. Pak, N. Toge, H. Hayashii, A. Sugiyama, M. Nussbaum, P. Kunz, P.K. Sinervo, W. Dunwoodie, A. Miyamoto, R. Endorf, K. Fujii, B. N. Ratcliff, H. Ozaki, D. W. G. S. Leith, T. Tauchi, J. D'Amore, and T. Matsui

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Series (mathematics), Excited state, Spherical harmonics, Atomic physics, Excitation
Abstract

High statistics data for the reaction K−p→K−π+n at 11 GeV/c have been obtained in the LASS spectrometer at SLAC. A spherical harmonic moments analysis provides clear evidence for the production of the complete leading orbitally excited K∗ series up through JP = 5−. New measurements are made of the masses and widths of the 1−K∗(892), 2+K∗(1430 ), 3− K∗(1780), and 4+ K∗(2060), and evidence is presented for the production of a new K∗ state at 2382 MeV/c2 with spin-parity 5−.

Published
1986
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17. Observation of ω∗− production in K−p interactions at 11 GeV/c

Author

S. H. Williams, N. Toge, H. Hayashii, B. T. Meadows, M. Nussbaum, Kumataro Ukai, A. P. Waite, P.K. Sinervo, R. Endorf, H. Ozaki, N. Awaji, P. Kunz, B. N. Ratcliff, J. D'Amore, K. Fujii, G. Tarnopolsky, W.B. Johnson, S. Iwata, A. Miyamoto, S. L. Shapiro, T. Bienz, T. Tauchi, R. Kajikawa, A. Sugiyama, W. Dunwoodie, T. Shimomura, D. W. G. S. Leith, T. Matsui, F. Bird, D.C. Schultz, D. Aston, Shiro Suzuki, C.O. Pak, and L. Levinson

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), State (functional analysis), Atomic physics, Resonance (particle physics), Beam (structure)
Abstract

Clear evidence is presented for the production of an Ω ∗− resonance of mass 2253±13 MeV/ c 2 and width 81±38 MeV/ c 2 in K − p interactions at 11 GeV/ c . The state is observed in the Ξ (1530)K decay mode, and the corresponding inclusive cross section is estimated to be 630±180 nb. Comparisons are made with theoretical predictions and with similar states observed inhyperon beam induced data.

Published
1987
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18. Polarized target asymmetry in π+ photoproduction between 0.3 and 1.0 GeV at 130°

Author

Shiro Suzuki, N. Tokuda, C.O. Pak, Toru Nakanishi, T. Ohshima, P. Feller, R. Kajikawa, Y. Tarui, K. Mizushima, N. Horikawa, T. Matsuda, T. Yamaki, M. Fukushima, Kunikazu Mori, and M. Saito

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, media_common.quotation_subject, Hadron, Bremsstrahlung, Elementary particle, Fermion, Asymmetry, Baryon, Nuclear physics, Pion, High Energy Physics::Experiment, Nuclear Experiment, Nucleon, media_common
Abstract

The polarized target asymmetry for γ + p → π + + n was measured at c.m. angles around 130° for the energy range between 0.3 and 1.0 GeV. A magnetic spectrometer system was used to detect π + mesons from the polarized butanol target. The data show two prominent positive peaks at 0.4 and 0.8 GeV and a deep minimum at 0.6 GeV. These features are well reproduced by the phenomenological analysis made by us.

Published
1974
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