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Start Over Author "Tokiyasu, A." Publisher oxford university press (oup)
8 results on '"Tokiyasu, A."'

1. Observation of the "K- pp"-like structure in the d( +, K+) reaction at 1.69 GeV/c

Author

Ichikawa, Y., primary, Nagae, T., additional, Fujioka, H., additional, Bhang, H., additional, Bufalino, S., additional, Ekawa, H., additional, Evtoukhovitch, P., additional, Feliciello, A., additional, Hasegawa, S., additional, Hayakawa, S., additional, Honda, R., additional, Hosomi, K., additional, Imai, K., additional, Ishimoto, S., additional, Joo, C., additional, Kanatsuki, S., additional, Kiuchi, R., additional, Koike, T., additional, Kumawat, H., additional, Matsumoto, Y., additional, Miwa, K., additional, Moritsu, M., additional, Naruki, M., additional, Niiyama, M., additional, Nozawa, Y., additional, Ota, R., additional, Sakaguchi, A., additional, Sako, H., additional, Samoilov, V., additional, Sato, S., additional, Shirotori, K., additional, Sugimura, H., additional, Suzuki, S., additional, Takahashi, T., additional, Takahashi, T. N., additional, Tamura, H., additional, Tanaka, T., additional, Tanida, K., additional, Tokiyasu, A. O., additional, Tsamalaidze, Z., additional, Roy, B., additional, Ukai, M., additional, Yamamoto, T. O., additional, and Yang, S., additional

Published
2015
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2. Backward-angle photoproduction of and ' mesons from protons in the photon energy range from 1.5 to 3.0 GeV

Author

Morino, Y., primary, Nakatsugawa, Y., additional, Yosoi, M., additional, Niiyama, M., additional, Sumihama, M., additional, Nakano, T., additional, Ahn, D. S., additional, Ahn, J. K., additional, Ajimura, S., additional, Chang, W. C., additional, Chen, J. Y., additional, Date, S., additional, Fujimura, H., additional, Fukui, S., additional, Hicks, K., additional, Hiraiwa, T., additional, Hotta, T., additional, Hwang, S. H., additional, Imai, K., additional, Ishikawa, T., additional, Kato, Y., additional, Kawai, H., additional, Kim, M. J., additional, Kohri, H., additional, Kon, Y., additional, Lin, P. J., additional, Mase, K., additional, Maeda, Y., additional, Miyabe, M., additional, Muramatsu, N., additional, Noumi, H., additional, Ohashi, Y., additional, Ohta, T., additional, Oka, M., additional, Parker, J. D., additional, Rangacharyulus, C., additional, Ryu, S. Y., additional, Saito, T., additional, Sawada, T., additional, Shimizu, H., additional, Strokovsky, E. A., additional, Sugaya, Y., additional, Suzuki, K., additional, Tanida, K., additional, Tokiyasu, A., additional, Tomioka, T., additional, Tsunemi, T., additional, Uchida, M., additional, Yamamura, R., additional, and Yorita, T., additional

Published
2015
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3. Observation of the 'K-pp'-like structure in the d(π+, K+) reaction at 1.69 GeV/ c

Author

R. Kiuchi, Kotaro Shirotori, A. O. Tokiyasu, Yudai Ichikawa, Takeshi Koike, Y. Matsumoto, Hirokazu Tamura, Seongbae Yang, Hiroyuki Ekawa, Tomonori Takahashi, Z. Tsamalaidze, Shuhei Hayakawa, Toshiyuki Tanaka, Ryotaro Honda, Hitoshi Sugimura, V. Samoilov, Stefania Bufalino, Harphool Kumawat, Shoichi Hasegawa, Yamamoto Takeshi, Shoji Suzuki, Toshiyuki Takahashi, Ryosuke Ota, Kiyoshi Tanida, Shunsuke Kanatsuki, Y. Nozawa, Hiroyuki Sako, B. J. Roy, Alessandro Feliciello, Manabu Moritsu, Kenichi Imai, Susumu Sato, Petr Evtoukhovitch, Megumi Naruki, Hyoungchan Bhang, Shigeru Ishimoto, Hiroyuki Fujioka, Mifuyu Ukai, Masayuki Niiyama, Koji Miwa, Kenji Hosomi, Tomofumi Nagae, C. Joo, and Atsushi Sakaguchi

Subjects
Physics, Particle physics, Proton, Nuclear Theory, Binding energy, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Resonance, Lambda, Spectral line, Deuterium, Pi, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have observed a "$K^-pp$"-like structure in the $d(\pi^+,K^+)$ reaction at 1.69 GeV/$c$. In this reaction $\Lambda(1405)$ hyperon resonance is expected to be produced as a doorway to form the $K^-pp$ through the $\Lambda^*p\rightarrow K^-pp$ process. However, most of the produced $\Lambda(1405)$'s would escape from deuteron without secondary reactions. Therefore, coincidence of high-momentum ($>$ 250~MeV/$c$) proton(s) in large emission angles ($39^\circ, Comment: 8 pages, 4 figures, submitted to PTEP

Published
2015
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4. Backward-angle photoproduction of and ' mesons from protons in the photon energy range from 1.5 to 3.0 GeV

Author

Yoji Ohashi, Hikaru Kawai, K. Mase, Masayuki Niiyama, J. K. Ahn, P. J. Lin, M. J. Kim, M. Uchida, T. Ishikawa, A. O. Tokiyasu, T. Tomioka, M. Sumihama, K. Hicks, Yuhei Morino, K. Tanida, E. A. Strokovsky, Yusuke T. Maeda, Takashi Ohta, S. Y. Ryu, Ryo Yamamura, T. Saito, Tomoaki Hotta, K. Imai, Y. Kon, C. Rangacharyulus, Hirohiko M. Shimizu, Tetsuhiko Yorita, T. Nakano, Manabu Miyabe, H. Kohri, S. Fukui, S. Ajimura, H. Fujimura, Y. Kato, S. H. Hwang, Jau-Ann Chen, D. S. Ahn, T. Sawada, Koutaku Suzuki, Toshihiko Hiraiwa, T. Tsunemi, Makoto Oka, S. Daté, Joseph D. Parker, Y. Nakatsugawa, W. C. Chang, Yorihito Sugaya, Norihito Muramatsu, M. Yosoi, and Hiroyuki Noumi

Subjects
Physics, Particle physics, Meson, Nuclear Theory, General Physics and Astronomy, High Energy Physics::Experiment, Nuclear Experiment, Omega, Differential (mathematics)
Abstract

We report the measurement of differential cross sections for $\omega$ and $\eta'$ photoproduction from protons at backward angles ($-1.0 2.4$ GeV. A bump structure in the $\sqrt{s}$ dependence of the differential cross sections for $\eta'$ mesons was observed at $\sqrt{s}\sim$2.35 GeV.

Published
2015
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5. Inclusive spectrum of the d( +, K+) reaction at 1.69 GeV/c

Author

Ichikawa, Y., primary, Nagae, T., additional, Bhang, H., additional, Bufalino, S., additional, Ekawa, H., additional, Evtoukhovitch, P., additional, Feliciello, A., additional, Fujioka, H., additional, Hasegawa, S., additional, Hayakawa, S., additional, Honda, R., additional, Hosomi, K., additional, Imai, K., additional, Ishimoto, S., additional, Joo, C., additional, Kanatsuki, S., additional, Kiuchi, R., additional, Koike, T., additional, Kumawat, H., additional, Matsumoto, Y., additional, Miwa, K., additional, Moritsu, M., additional, Naruki, M., additional, Niiyama, M., additional, Nozawa, Y., additional, Ota, R., additional, Sakaguchi, A., additional, Sako, H., additional, Samoilov, V., additional, Sato, S., additional, Shirotori, K., additional, Sugimura, H., additional, Suzuki, S., additional, Takahashi, T., additional, Takahashi, T. N., additional, Tamura, H., additional, Tanaka, T., additional, Tanida, K., additional, Tokiyasu, A. O., additional, Tsamalaidze, Z., additional, Roy, B., additional, Ukai, M., additional, Yamamoto, T. O., additional, and Yang, S., additional

Published
2014
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6. Inclusive spectrum of the d(π+, K+) reaction at 1.69 GeV/c

Author

Susumu Sato, Petr Evtoukhovitch, Stefania Bufalino, Toshiyuki Takahashi, Hiroyuki Ekawa, Shoji Suzuki, Megumi Naruki, Shigeru Ishimoto, Yudai Ichikawa, Seongbae Yang, T. Takahashi, R. Kiuchi, Hitoshi Sugimura, Y. Nozawa, Z. Tsamalaidze, Hirokazu Tamura, Masayuki Niiyama, Alessandro Feliciello, Manabu Moritsu, Kenichi Imai, C. Joo, B. J. Roy, Shunsuke Kanatsuki, Y. Matsumoto, Takeshi Koike, Toshiyuki Tanaka, Kotaro Shirotori, Hiroyuki Sako, Harphool Kumawat, Shoichi Hasegawa, Kiyoshi Tanida, Shuhei Hayakawa, Mifuyu Ukai, Hyoungchan Bhang, Hiroyuki Fujioka, V. Samoilov, Ryosuke Ota, A. O. Tokiyasu, Takeshi O. Yamamoto, Ryotaro Honda, Atsushi Sakaguchi, Koji Miwa, Kenji Hosomi, and Tomofumi Nagae

Subjects
Physics, Particle physics, Proton, Scattering, Hyperon, FOS: Physical sciences, General Physics and Astronomy, Lambda, Resonance (particle physics), Momentum, Pion, High Energy Physics::Experiment, Neutron, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We have measured an inclusive missing-mass spectrum of the $d(\pi^+, K^+)$ reaction at the pion incident momentum of 1.69 GeV/$c$ at the laboratory scattering angles between 2$^\circ$ and 16$^\circ$ with the missing-mass resolution of 2.7 $\pm$ 0.1 MeV/$c^2$ (FWHM) at the missing mass of 2.27 GeV/$c^{2}$. In this Letter, we first try to understand the spectrum as a simple quasi-free picture based on several known elementary cross sections, considering the neutron/proton Fermi motion in deuteron. While gross spectrum structures are well understood in this picture, we have observed two distinct deviations; one peculiar enhancement at 2.13 GeV/$c^2$ is due to the $\Sigma N$ cusp, and the other notable feature is a shift of a broad bump structure, mainly originating from hyperon resonance productions of $\Lambda(1405)$ and $\Sigma(1385)^{+/0}$, by about 22.4 $\pm$ 0.4 (stat.) $^{+2.7}_{-1.7}$ (syst.) MeV/$c^2$ toward the low-mass side, which is calculated in the kinematics of a proton at rest as the target., Comment: 8 pages, 3 figures, submitted to PTEP

Published
2014
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7. Beam and SKS spectrometers at the K1.8 beam line

Author

Takahashi, Toshiyuki, primary, Adachi, Satoshi, additional, Agnello, Michelangelo, additional, Aoki, Kanae, additional, Araoka, Osamu, additional, Bassalleck, Bernd, additional, Botta, Elena, additional, Bufalino, Stefania, additional, Chiga, Nobuyuki, additional, Evtoukhovitch, Petr, additional, Feliciello, Alessandro, additional, Franz, Juergen, additional, Fujioka, Hiroyuki, additional, Hayakawa, Shuhei, additional, Hirose, Erina, additional, Honda, Ryotaro, additional, Hosomi, Kenji, additional, Ichikawa, Yudai, additional, Igarashi, Youichi, additional, Iida, Masahisa, additional, Ikeno, Masahiro, additional, Itahashi, Kenta, additional, Ishibashi, Naoya, additional, Ishimoto, Shigeru, additional, Iwasaki, Ruri, additional, Kakiguchi, Yutaka, additional, Kasami, Katsuyu, additional, Kim, Sunji, additional, Kiuchi, Ryuta, additional, Koike, Takeshi, additional, Komatsu, Yusuke, additional, Kustov, Alexandr, additional, Mjavia, David, additional, Makida, Yasuhiro, additional, Marcello, Simonetta, additional, Maruta, Tomofumi, additional, Masumoto, Shinichi, additional, Matsuoka, Kenji, additional, Miwa, Koji, additional, Moiseenko, Anatolii, additional, Moritsu, Manabu, additional, Nagae, Tomofumi, additional, Naruki, Megumi, additional, Noumi, Hiroyuki, additional, Ohhata, Hirokazu, additional, Okamura, Takahiro, additional, Ota, Ryosuke, additional, Saito, Masatoshi, additional, Sakaguchi, Atsushi, additional, Samoilov, Valentin, additional, Sato, Misako, additional, Sato, Yoshinori, additional, Sekimoto, Michiko, additional, Shirakabe, Yoshihisa, additional, Shirotori, Kotaro, additional, Sugimura, Hitoshi, additional, Suzuki, Shoji, additional, Suzuki, Yoshihiro, additional, Takahashi, Hitoshi, additional, Takahashi, Tomonori N., additional, Tamura, Hirokazu, additional, Tanaka, Manobu, additional, Tauchi, Kazuya, additional, Tanaka, Toshiyuki, additional, Tanida, Kiyoshi, additional, Tokiyasu, Atsushi O., additional, Yoshida, Kotaro, additional, Toyoda, Akihisa, additional, Tsamalaidze, Zviadi, additional, Uchida, Tomohisa, additional, Ukai, Mifuyu, additional, Watanabe, Hiroaki, additional, Yamamoto, Takeshi O., additional, Yonemoto, Yoshio, additional, and Yoon, Choong-Jae, additional

Published
2012
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