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11 results on '"T. Ooyabu"'

1. Measurement of neutrino oscillation by the K2K experiment

Author

S. Andringa, T. Nakadaira, R. Gran, Tadayuki Takahashi, Yoshitaka Itow, Makoto Sakuda, F. Nakata, K. Fujii, A. Rodriguez, D. Kerr, M. H. Ahn, U. Dore, S. Likhoded, S P Mikheyev, K. Martens, Y. Totsuka, Y. Takubo, Kate Scholberg, Y. Takeuchi, Yu. Kudenko, Shinya Yamada, H. I. Jang, S. C. Boyd, M. Okumura, A. Blondel, A. Ikeda, K. Tashiro, Itsuo Nakano, C. K. Jung, M. Sekiguchi, H. Yokoyama, F. Pierre, Minoru Yoshida, M. Kitamura, L. Whitehead, K. Taki, S. Nawang, N. Yershov, Shogo Nishiyama, O. V. Mineev, E. Sharkey, K. Kaneyuki, Hirokazu Ishino, D. Kielczewska, Shoei Nakayama, Taichi Morita, Y. Kurimoto, Hiroyuki Noumi, T. Otaki, R. Schroeter, L. Ludovici, E. J. Jeon, Takashi Kobayashi, J. Kameda, M. Onchi, Y. Yamanoi, C. Cavata, M. Sorel, Katsuki Hiraide, H. C. Bhang, P. F. Loverre, J. Bouchez, M. Y. Pac, G. Sitjes, S. Mine, C. O. Kim, I. Kato, E. Seo, A. Shima, T. Kutter, K. Hayashi, H. So, S. M. Oser, T. Ishida, J. Hill, J. Catala, A. K. Ichikawa, Tomoyuki Maruyama, T. Hara, K. K. Joo, Lawrence Sulak, P. Novella, Susumu Noda, S. Fukuda, K. Takenaka, Yoshitaka Kuno, T. Ishii, Masaaki Tanaka, F. Nova, John G. Learned, Y. Yamada, B. H. Kang, Y. Obayashi, M. Takasaki, A. Minamino, A. Tornero-Lopez, J.J. Gómez-Cadenas, Takanori Sasaki, M. Fechner, S. Echigo, C. Yanagisawa, J. Zalipska, C. McGrew, G. Jover, J.H. Kim, K. Nakamura, K. B. McConnel Mahn, S. B. Kim, V. A. Matveev, M. Minakawa, A. Cervera, C. W. Walter, Y. Takenaga, Y. Hayato, Yuichi Oyama, Masaya Hasegawa, M. Miura, G. Kume, M. Tada, David William Casper, Takehisa Hasegawa, C. Mitsuda, K. Sato, J. Hosaka, A. Suzuki, R. L. Helmer, Hyosun Kim, Katsuhiro Kobayashi, A. Sakai, Nobuyuki Sakurai, Yusuke Koshio, S. Ueda, Shoji Yamamoto, J. Mallet, S. Matsuno, H. Takeuchi, T. Ooyabu, Masayuki Nakahata, Y. Aoyama, R. Terri, R. Ashie, H. Ishii, Y. Suga, Masashi Yokoyama, J. S. Jang, G. Mitsuka, E. Aliu, H. Tanaka, A. Sarrat, Mark R. Vagins, K. K. Shiraishi, Takaaki Kajita, Masaki Ishitsuka, Kenichi Tanaka, Yoshihiro Suzuki, H. Park, Masaharu Ieiri, X. Espinal, Y. Moriguchi, Beom Jun Kim, Michael B. Smy, Y. Fukuda, T. Iwashita, R. J. Wilkes, I. Higuchi, I. T. Lim, Y. Kato, W. R. Kropp, Federico Sanchez, Toshio Namba, C. Mariani, H. Maesaka, Ko Okumura, E. Kearns, Shigeki Aoki, T. Toshito, Hiroshi Sato, K. Asakura, P. Kitching, C. Mauger, J. Argyriades, H. Nishino, S. H. Lim, A. Okada, M. Kohama, M. Takatsuki, F. Berghaus, Tsuyoshi Nakaya, C. Saji, J. Kubota, Jordi Burguet-Castell, H. G. Berns, W. Wang, Masataka Iinuma, E. Hirose, J. Yoo, K. Nishikawa, J. Y. Kim, Henry W. Sobel, K. Nitta, Y. Tanaka, Masato Shiozawa, Shaomin Chen, A. Konaka, Shigetaka Moriyama, K. O. Cho, R. Nambu, N. Tamura, Silvia Borghi, J. L. Stone, T. Inagaki, A. N. Khotjantsev, Y. Fujii, J. H. Choi, M. M. Khabibullin, Stephane T'Jampens, E. Fernandez, I. S. Jeong, and K. Ishihara

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Tamura, Norio, 010308 nuclear & particles physics, Oscillation, T2K experiment, FOS: Physical sciences, Física, Elementary particle, 7. Clean energy, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Massless particle, High Energy Physics - Experiment (hep-ex), K2K experiment, 0103 physical sciences, 田村, 詔生, Neutrino, 010306 general physics, Neutrino oscillation, Lepton
Abstract

We present measurements of nu_mu disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment. One hundred and twelve beam-originated neutrino events are observed in the fiducial volume of Super-Kamiokande with an expectation of 158.1^{+9.2}_{-8.6} events without oscillation. A distortion of the energy spectrum is also seen in 58 single-ring muon-like events with reconstructed energies. The probability that the observations are explained by the expectation for no neutrino oscillation is 0.0015% (4.3sigma). In a two flavor oscillation scenario, the allowed Delta m^2 region at sin^2(2theta) is between 1.9 and 3.5 x 10^{-3} eV^2 at the 90% C.L. with a best-fit value of 2.8 x 10^{-3} eV^2., Comment: 40 pages, 48 figures

Published
2006

2. Secondary beam production in the nuclear and particle physics facility in J-PARC

Author

A. Ichikawa, J. Imazato, K. Nishikawa, Y. Hayato, T. Nakadaira, Erina Hirose, S. Ueda, Michifumi Minakawa, Hiroyuki Noumi, Yoshinori Sato, Yoshihiro Suzuki, T. Ooyabu, Hitoshi Takahashi, Keizo Agari, Yutaka Yamanoi, and Takashi Kobayashi

Subjects
Physics, Accelerator physics, Nuclear and High Energy Physics, Particle physics, Muon, Proton, Nuclear Theory, Particle accelerator, Particle detector, law.invention, Nuclear physics, Nuclear Energy and Engineering, law, Physics::Accelerator Physics, High Energy Physics::Experiment, General Materials Science, J-PARC, Neutrino, Nuclear Experiment, Beam (structure)
Abstract

At the Japan Proton Accelerator Research Complex (J-PARC), the world highest intensity secondary beams of kaons, pions, anti-protons, muons, and neutrinos will be produced by irradiating a target with the 50 GeV primary proton beam of 0.75 MW. Utilizing such high intensity secondary beams, various unique and interesting experimental studies in nuclear and particle physics can be carried out. We will describe the current R&D status of the target systems to be constructed in the Nuclear and Particle Physics Experimental Hall (NP-Hall) and the neutrino beam line of J-PARC. Some experimental studies proposed there will be also introduced.

Published
2005

3. Indications of Neutrino Oscillation in a 250 km Long-Baseline Experiment

Author

David William Casper, C. W. Walter, Makoto Sakuda, C. Yanagisawa, Toshio Namba, M. H. Ahn, K. Martens, W. R. Kropp, Nobuyuki Sakurai, H. W. Sobel, S. Fukuda, Atsumu Suzuki, H. Maesaka, Takehisa Hasegawa, T. Iwashita, Minoru Yoshida, Y. Fukuda, S. H. Lim, S. B. Boyd, K. Nishikawa, S. Mine, J. L. Stone, Y. Takeuchi, K. Kaneyuki, Yuichi Oyama, E. Kearns, T. Inagaki, Shinya Yamada, Y. Totsuka, E. J. Jeon, M. Kohama, Shoei Nakayama, Koji Nakamura, S. Matsuno, H. I. Jang, Kazumasa Miyano, J. Hill, C. K. Jung, Masaya Hasegawa, M. Miura, S. B. Kim, Tomoyuki Maruyama, J. H. Choi, D. Kielczewska, Hwangseo Park, I. Kato, John G. Learned, Itsuo Nakano, L. R. Sulak, T. Ishida, A. Obayashi, E. Sharkey, Susumu Noda, H. C. Bhang, T. Ishii, N. Tamura, M. Y. Pac, Yasunari Suzuki, C. O. Kim, N. Sasao, J. S. Jang, H. Yokoyama, W. Gajewski, Kate Scholberg, Ken-ichiro Kobayashi, A. K. Ichikawa, T. Toshito, R. J. Wilkes, Shigetaka Moriyama, A. Kibayashi, J. Y. Kim, I. T. Lim, T. Hara, Shogo Nishiyama, J. Kameda, C. McGrew, M. Ishitsuka, H. So, Shigeki Aoki, J. Yoo, J. Zalipska, Takashi Kobayashi, A. Ikeda, Y. Hayato, A. L. Stachyra, Mark R. Vagins, Masato Shiozawa, Shoji Yamamoto, Tsuyoshi Nakaya, Y. Suga, F. Nakata, Beom Jun Kim, Yoshitaka Itow, Yusuke Koshio, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, C. Mauger, and A. Okada

Subjects
Physics, Tamura, Norio, Physics::Instrumentation and Detectors, Oscillation, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, High Energy Physics::Phenomenology, FOS: Physical sciences, General Physics and Astronomy, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), K2K experiment, Measurements of neutrino speed, High Energy Physics::Experiment, 田村, 詔生, Neutrino, Neutrino oscillation, Charged current
Abstract

The K2K experiment observes indications of neutrino oscillation: a reduction of $\nu_\mu$ flux together with a distortion of the energy spectrum. Fifty-six beam neutrino events are observed in Super-Kamiokande (SK), 250 km from the neutrino production point, with an expectation of $80.1^{+6.2}_{-5.4}$. Twenty-nine one ring $\mu$-like events are used to reconstruct the neutrino energy spectrum, which is better matched to the expected spectrum with neutrino oscillation than without. The probability that the observed flux at SK is explained by statistical fluctuation without neutrino oscillation is less than 1%., Comment: 5 pages, 3 figures embedded, LaTeX with RevTeX style, accepted for publication in PRL on December 13, 2002

Published
2003

4. Publisher's Note: Search for dark matter WIMPs using upward through-going muons in Super-Kamiokande [Phys. Rev. D70, 083523 (2004)]

Author

S. Desai, Y. Ashie, S. Fukuda, Y. Fukuda, K. Ishihara, Y. Itow, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, T. Namba, R. Nambu, Y. Obayashi, N. Sakurai, M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, S. Yamada, M. Ishitsuka, T. Kajita, K. Kaneyuki, S. Nakayama, A. Okada, T. Ooyabu, C. Saji, M. Earl, E. Kearns, J. L. Stone, L. R. Sulak, C. W. Walter, W. Wang, M. Goldhaber, T. Barszczak, D. Casper, J. P. Cravens, W. Gajewski, W. R. Kropp, S. Mine, D. W. Liu, M. B. Smy, H. W. Sobel, C. W. Sterner, M. R. Vagins, K. S. Ganezer, J. Hill, W. E. Keig, J. Y. Kim, I. T. Lim, R. W. Ellsworth, S. Tasaka, G. Guillian, A. Kibayashi, J. G. Learned, S. Matsuno, D. Takemori, M. D. Messier, Y. Hayato, A. K. Ichikawa, T. Ishida, T. Ishii, T. Iwashita, J. Kameda, T. Kobayashi, T. Maruyama, K. Nakamura, K. Nitta, Y. Oyama, M. Sakuda, Y. Totsuka, A. T. Suzuki, M. Hasegawa, K. Hayashi, T. Inagaki, I. Kato, H. Maesaka, T. Morita, T. Nakaya, K. Nishikawa, T. Sasaki, S. Ueda, S. Yamamoto, T. J. Haines, S. Dazeley, S. Hatakeyama, R. Svoboda, E. Blaufuss, J. A. Goodman, G. W. Sullivan, D. Turcan, K. Scholberg, A. Habig, C. K. Jung, T. Kato, K. Kobayashi, M. Malek, C. Mauger, C. McGrew, A. Sarrat, E. Sharkey, C. Yanagisawa, T. Toshito, C. Mitsuda, K. Miyano, T. Shibata, Y. Kajiyama, Y. Nagashima, M. Takita, M. Yoshida, H. I. Kim, S. B. Kim, J. Yoo, H. Okazawa, T. Ishizuka, Y. Choi, H. K. Seo, Y. Gando, T. Hasegawa, K. Inoue, J. Shirai, A. Suzuki, M. Koshiba, T. Hashimoto, Y. Nakajima, K. Nishijima, T. Harada, H. Ishino, M. Morii, R. Nishimura, Y. Watanabe, D. Kielczewska, J. Zalipska, R. Gran, K. K. Shiraishi, K. Washburn, and R. J. Wilkes

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Weakly interacting massive particles, Dark matter, Cosmic ray, Elementary particle, Neutrino, Super-Kamiokande, Light dark matter, Particle identification
Published
2004

5. Limits on the Neutrino Magnetic Moment using 1496 Days of Super-Kamiokande-I Solar Neutrino Data

Author

G. Guillian, Atsumu Suzuki, K. Hayashi, C. McGrew, Y. Hayato, K. Nishikawa, T. J. Haines, E. Kearns, Toshio Namba, Y. Watanabe, John G. Learned, Y. Totsuka, S. B. Kim, J. L. Stone, T. Inagaki, Kenzo Nakamura, D. Takemori, Shoji Yamamoto, C. Saji, Yusuke Koshio, H. Maesaka, G. W. Sullivan, T. Toshito, M. Earl, M. Ishitsuka, C. K. Jung, D. Kielczewska, C. W. Walter, Katsuhiro Kobayashi, M. D. Messier, H. W. Sobel, T. Hashimoto, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, C. Mauger, Shantanu Desai, S. Ueda, Michael B. Smy, H. Seo, T. Maruyama, S. Fukuda, Yoshitaka Kuno, I. Kato, A. Okada, W. Wang, Y. Ashie, H. Okazawa, Kunio Inoue, Minoru Yoshida, M. Takita, J. Y. Kim, Mikio Morii, Takehisa Hasegawa, Yuichi Oyama, Y. Obayashi, K. S. Ganezer, K. Kaneyuki, R. Nishimura, Makoto Sakuda, Magdalena Malek, Y. Fukuda, A. K. Ichikawa, Hyosun Kim, T. Ishizuka, T. Shibata, J. Zalipska, K. Martens, S. Mine, A. Minamino, T. Sasaki, J. Kameda, Y. Takeuchi, Shinya Yamada, S. Matsuno, T. Ishida, Taichi Morita, R. W. Ellsworth, L. R. Sulak, M. Ackermann, T. Kobayashi, Y. Kajiyama, Masatoshi Koshiba, Yoshihiro Suzuki, D. W. Liu, B. Viren, Alec Habig, T. Kato, C. W. Sterner, A. Kibayashi, J. Ishii, J. A. Goodman, J. P. Cravens, E. Blaufuss, W. R. Kropp, W. Gajewski, Kate Scholberg, T. Iwashita, K. Nitta, Kyoshi Nishijima, D. Turcan, Hirokazu Ishino, Y. Nakajima, K. Ishihara, David William Casper, J. Shirai, Shigetaka Moriyama, Y. Nagashima, H. Takeuchi, Masaya Hasegawa, M. Miura, Nobuyuki Sakurai, Shoei Nakayama, K. K. Shiraishi, Shigeki Tasaka, E. Sharkey, S. Dazeley, K. Washburn, S. Hatakeyama, R. Gran, C. Mitsuda, Yoshitaka Itow, R. J. Wilkes, I. T. Lim, C. Yanagisawa, J. Yoo, Kazumasa Miyano, Masato Shiozawa, Y. Choi, T. Barszczak, J. Hill, Y. Gando, T. Ishii, R. Nambu, A. Suzuki, R. Svoboda, Tsuyoshi Nakaya, W. E. Keig, and Mark R. Vagins

Subjects
Physics, Particle physics, Magnetic moment, Physics::Instrumentation and Detectors, Solar neutrino, High Energy Physics::Phenomenology, General Physics and Astronomy, Electron, Solar neutrino problem, High Energy Physics - Experiment, Nuclear physics, Measurements of neutrino speed, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Neutrino oscillation
Abstract

A search for a non-zero neutrino magnetic moment has been conducted using 1496 live days of solar neutrino data from {\SK}. Specifically, we searched for distortions to the energy spectrum of recoil electrons arising from magnetic scattering due to a non-zero neutrino magnetic moment. In the absence of clear signal, we found $\mu_{\nu} \leq 3.6 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. by fitting to the Super-Kamiokande day/night spectra. The fitting took into account the effect of neutrino oscillation on the shapes of energy spectra. With additional information from other solar neutrino and KamLAND experiments constraining the oscillation region, a limit of $\mu_{\nu} \leq 1.1 \times 10^{-10}$ $\mu_{B}$ at 90% C.L. was obtained., Comment: 5 pages, 4 figures

Published
2004

6. Evidence for an oscillatory signature in atmospheric neutrino oscillations

Author

Toshio Namba, J. Yoo, J. P. Cravens, Masato Shiozawa, Shantanu Desai, Atsumu Suzuki, W. Gajewski, Kate Scholberg, Y. Totsuka, H. Maesaka, T. Sasaki, E. Kearns, Mark R. Vagins, Y. Takeuchi, Shinya Yamada, E. Blaufuss, Y. Nagashima, Masaki Ishitsuka, A. L. Stachyra, J. Zalipska, C. McGrew, J. Shirai, A. Suzuki, Takaaki Kajita, R. Nishimura, Makoto Sakuda, Y. Hayato, K. Taki, R. Svoboda, G. Guillian, A. Kibayashi, E. Sharkey, S. Dazeley, Y. Watanabe, Hirokazu Ishino, L. R. Sulak, J. Kameda, Ko Okumura, C. Yanagisawa, S. Likhoded, Yoshitaka Itow, W. R. Kropp, Shoji Yamamoto, C. W. Walter, M. Goldhaber, C. Saji, Y. Kuno, M. Takita, Y. Ashie, C. W. Sterner, Tsuyoshi Nakaya, K. Nakamura, T. Toshito, K. Washburn, K. Hayashi, S. Mine, Kunio Inoue, S. Hatakeyama, R. Gran, Y. Gando, H. Okazawa, Tomoyuki Maruyama, T. Ooyabu, A. Minamino, T. Ishida, John G. Learned, H. W. Sobel, W. Wang, Masayuki Nakahata, T. Iwashita, K. Kaneyuki, Y. Fukuda, R. Nambu, A. Sarrat, D. W. Liu, T. Ishizuka, C. K. Jung, Alec Habig, S. Matsuno, S. Ueda, Minoru Yoshida, D. Takemori, D. Kielczewska, Magdalena Malek, Todd Haines, N. Tamura, Yasunari Suzuki, Y. Choi, M. D. Messier, K. Nishikawa, G. W. Sullivan, J. L. Stone, T. Inagaki, Kazumasa Miyano, Taichi Morita, R. W. Ellsworth, T. Kobayashi, C. Mauger, Takehisa Hasegawa, Masatoshi Koshiba, J. S. Jang, T. Ishii, A. Okada, I. Kato, H. G. Berns, Yusuke Koshio, John Hill, Michael B. Smy, Katsuhiro Kobayashi, J. Ishii, Y. Takenaga, H. Seo, Masaya Hasegawa, M. Miura, David William Casper, T. Harada, C. Mitsuda, R. J. Wilkes, Y. Obayashi, J. Hosaka, K. Nitta, S. Tasaka, W. E. Keig, S. B. Kim, Kyoshi Nishijima, J. Y. Kim, D. Turcan, I. T. Lim, Y. Nakajima, K. K. Shiraishi, K. Ishihara, T. Kato, Shigetaka Moriyama, Yuichi Oyama, J. A. Goodman, Shoei Nakayama, A. K. Ichikawa, and K. S. Ganezer

Subjects
Physics, Particle physics, Tamura, Norio, Physics::Instrumentation and Detectors, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, High Energy Physics - Experiment, Distribution (mathematics), Measurements of neutrino speed, 田村, 詔生, High Energy Physics::Experiment, Muon neutrino, Atmospheric neutrino, Neutrino, Signature (topology), Neutrino oscillation, Energy (signal processing)
Abstract

Muon neutrino disappearance probability as a function of neutrino flight length L over neutrino energy E was studied. A dip in the L/E distribution was observed in the data, as predicted from the sinusoidal flavor transition probability of neutrino oscillation. The observed L/E distribution constrained nu_mu nu_tau neutrino oscillation parameters; 1.9x10^-3 < Delta m^2 < 3.0x10^-3 eV^2 and \sin^2(2theta) > 0.90 at 90% confidence level., Comment: 5 pages, 5 figures, submitted to PRL

Published
2004

7. Search for Dark Matter WIMPs using Upward Through-going Muons in Super-Kamiokande

Author

K. Kaneyuki, G. Guillian, H. W. Sobel, Atsumu Suzuki, S. Mine, M. Goldhaber, J. Y. Kim, Mikio Morii, Takaaki Kajita, Magdalena Malek, E. Kearns, Y. Nagashima, H. Takeuchi, Hyosun Kim, M. Ishitsuka, Shoei Nakayama, Lawrence Sulak, C. Saji, David William Casper, Shantanu Desai, Nobuyuki Sakurai, Yoshihiro Suzuki, Todd Haines, Masatoshi Koshiba, C. McGrew, Y. Totsuka, E. Blaufuss, Y. Ashie, Y. Hayato, S. Ueda, Y. Takeuchi, Shinya Yamada, R. Nishimura, Makoto Sakuda, Minoru Yoshida, M. D. Messier, J. L. Stone, A. Kibayashi, T. Kobayashi, Kunio Inoue, Michael B. Smy, K. K. Shiraishi, W. R. Kropp, W. Wang, Y. Kajiyama, T. Inagaki, Toshio Namba, M. Earl, K. Nitta, Kenzo Nakamura, Yoshitaka Itow, Kyoshi Nishijima, C. W. Sterner, T. Ishii, C. Yanagisawa, C. Mauger, H. Seo, H. Maesaka, A. Minamino, Yusuke Koshio, Shigetaka Moriyama, T. Iwashita, Mark R. Vagins, Masaya Hasegawa, M. Miura, A. Okada, K. Hayashi, Kazumasa Miyano, John Hill, C. W. Walter, T. Hashimoto, J. G. Learned, T. Ishizuka, K. Washburn, T. Shibata, A. K. Ichikawa, D. Takemori, T. Ooyabu, G. W. Sullivan, C. Mitsuda, S. Hatakeyama, Masayuki Nakahata, R. Gran, C. K. Jung, D. Turcan, D. Kielczewska, Taichi Morita, R. W. Ellsworth, Katsuhiro Kobayashi, D. W. Liu, J. Kameda, M. Takita, R. J. Wilkes, I. Kato, Y. Nakajima, Hirokazu Ishino, I. T. Lim, A. Sarrat, Y. Fukuda, K. Ishihara, Y. Obayashi, S. Tasaka, W. E. Keig, J. A. Goodman, T. Harada, T. Kato, K. Nishikawa, Yuichi Oyama, Tomoyuki Maruyama, S. B. Kim, J. Zalipska, K. S. Ganezer, J. P. Cravens, T. Ishida, Takehisa Hasegawa, T. Sasaki, Y. Choi, W. Gajewski, Kate Scholberg, Y. Watanabe, T. Toshito, Shoji Yamamoto, J. Shirai, E. Sharkey, S. Dazeley, S. Fukuda, H. Okazawa, Alec Habig, S. Matsuno, Y. Gando, R. Nambu, J. Yoo, Masato Shiozawa, T. Barszczak, A. Suzuki, R. Svoboda, and Tsuyoshi Nakaya

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics::Instrumentation and Detectors, Dark matter, Astrophysics (astro-ph), FOS: Physical sciences, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), WIMP, Neutrino detector, Weakly interacting massive particles, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Light dark matter
Abstract

We present the results of indirect searches for Weakly Interacting Massive Particles (WIMPs) with 1679.6 live days of data from the Super-Kamiokande detector using neutrino-induced upward through-going muons. The search is performed by looking for an excess of high energy muon neutrinos from WIMP annihilations in the Sun, the core of the Earth, and the Galactic Center, as compared to the number expected from the atmospheric neutrino background. No statistically significant excess was seen. We calculate flux limits in various angular cones around each of the above celestial objects. We obtain conservative model-independent upper limits on WIMP-nucleon cross-section as a function of WIMP mass and compare these results with the corresponding results from direct dark matter detection experiments., 10 pages, 14 figures, Submitted to Phys. Rev. D

Published
2004

8. Search for periodic modulations of the solar neutrino flux in Super-Kamiokande-I

Author

J. Yoo, Y. Ashie, S. Fukuda, Y. Fukuda, K. Ishihara, Y. Itow, Y. Koshio, A. Minamino, M. Miura, S. Moriyama, M. Nakahata, T. Namba, R. Nambu, Y. Obayashi, N. Sakurai, M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, S. Yamada, M. Ishitsuka, T. Kajita, K. Kaneyuki, S. Nakayama, A. Okada, T. Ooyabu, C. Saji, S. Desai, M. Earl, E. Kearns, M. D. Messier, J. L. Stone, L. R. Sulak, C. W. Walter, M. Goldhaber, T. Barszczak, D. Casper, W. Gajewski, W. R. Kropp, S. Mine, D. W. Liu, M. B. Smy, H. W. Sobel, M. R. Vagins, A. Gago, K. S. Ganezer, J. Hill, W. E. Keig, J. Y. Kim, I. T. Lim, R. W. Ellsworth, S. Tasaka, A. Kibayashi, J. G. Learned, S. Matsuno, D. Takemori, Y. Hayato, A. K. Ichikawa, T. Ishii, J. Kameda, T. Kobayashi, T. Maruyama, K. Nakamura, K. Nitta, Y. Oyama, M. Sakuda, Y. Totsuka, M. Yoshida, M. Kohama, T. Iwashita, A. T. Suzuki, T. Inagaki, I. Kato, T. Nakaya, K. Nishikawa, T. J. Haines, S. Dazeley, S. Hatakeyama, R. Svoboda, E. Blaufuss, M. L. Chen, J. A. Goodman, G. Guillian, G. W. Sullivan, D. Turcan, K. Scholberg, A. Habig, M. Ackermann, C. K. Jung, T. Kato, K. Kobayashi, K. Martens, M. Malek, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, T. Toshito, C. Mitsuda, K. Miyano, T. Shibata, Y. Kajiyama, Y. Nagashima, M. Takita, H. I. Kim, S. B. Kim, H. Okazawa, T. Ishizuka, Y. Choi, H. K. Seo, M. Etoh, Y. Gando, T. Hasegawa, K. Inoue, J. Shirai, A. Suzuki, M. Koshiba, Y. Hatakeyama, Y. Ichikawa, M. Koike, K. Nishijima, H. Ishino, M. Morii, R. Nishimura, Y. Watanabe, D. Kielczewska, H. G. Berns, S. C. Boyd, A. L. Stachyra, and R. J. Wilkes

Subjects
Physics, Nuclear and High Energy Physics, Astrophysics::High Energy Astrophysical Phenomena, Solar neutrino, Detector, FOS: Physical sciences, Flux, Astrophysics, Solar neutrino problem, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Neutrino detector, Astrophysics::Solar and Stellar Astrophysics, Measurements of neutrino speed, High Energy Physics::Experiment, Super-Kamiokande, Neutrino oscillation
Abstract

A search for periodic modulations of the solar neutrino flux was performed using the Super-Kamiokande-I data taken from May 31st, 1996 to July 15th, 2001. The detector's capability of measuring the exact time of events, combined with a relatively high yield of solar neutrino events, allows a search for short-time variations in the observed flux. We employed the Lomb test to look for periodic modulations of the observed solar neutrino flux. The obtained periodogram is consistent with statistical fluctuation and no significant periodicity was found.

Published
2003

9. Search for Supernova Relic Neutrinos at Super-Kamiokande

Author

M. Malek, M. Morii, S. Fukuda, Y. Fukuda, M. Ishitsuka, Y. Itow, T. Kajita, J. Kameda, K. Kaneyuki, K. Kobayashi, Y. Koshio, M. Miura, S. Moriyama, M. Nakahata, S. Nakayama, T. Namba, A. Okada, T. Ooyabu, C. Saji, N. Sakurai, M. Shiozawa, Y. Suzuki, H. Takeuchi, Y. Takeuchi, Y. Totsuka, S. Yamada, S. Desai, M. Earl, E. Kearns, M. D. Messier, J. L. Stone, L. R. Sulak, C. W. Walter, M. Goldhaber, T. Barszczak, D. Casper, W. Gajewski, W. R. Kropp, S. Mine, D. W. Liu, M. B. Smy, H. W. Sobel, M. R. Vagins, A. Gago, K. S. Ganezer, W. E. Keig, R. W. Ellsworth, S. Tasaka, A. Kibayashi, J. G. Learned, S. Matsuno, D. Takemori, Y. Hayato, T. Ishii, T. Kobayashi, T. Maruyama, K. Nakamura, Y. Obayashi, Y. Oyama, M. Sakuda, M. Yoshida, M. Kohama, T. Iwashita, A. T. Suzuki, A. Ichikawa, T. Inagaki, I. Kato, T. Nakaya, K. Nishikawa, T. J. Haines, S. Dazeley, S. Hatakeyama, R. Svoboda, E. Blaufuss, J. A. Goodman, G. Guillian, G. W. Sullivan, D. Turcan, K. Scholberg, A. Habig, M. Ackermann, J. Hill, C. K. Jung, K. Martens, C. Mauger, C. McGrew, E. Sharkey, B. Viren, C. Yanagisawa, T. Toshito, C. Mitsuda, K. Miyano, T. Shibata, Y. Kajiyama, Y. Nagashima, K. Nitta, M. Takita, H. I. Kim, S. B. Kim, J. Yoo, H. Okazawa, T. Ishizuka, M. Etoh, Y. Gando, T. Hasegawa, K. Inoue, K. Ishihara, J. Shirai, A. Suzuki, M. Koshiba, Y. Hatakeyama, Y. Ichikawa, M. Koike, K. Nishijima, H. Ishino, R. Nishimura, Y. Watanabe, D. Kielczewska, H. G. Berns, S. C. Boyd, A. L. Stachyra, and R. J. Wilkes

Subjects
Physics, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, General Physics and Astronomy, Flux, Cosmic ray, Astrophysics, Upper and lower bounds, High Energy Physics - Experiment, Nuclear physics, Supernova, Positron, High Energy Physics::Experiment, Neutrino, Super-Kamiokande, Charged current
Abstract

A search for the relic neutrinos from all past core-collapse supernovae was conducted using 1496 days of data from the Super-Kamiokande detector. This analysis looked for electron-type anti-neutrinos that had produced a positron with an energy greater than 18 MeV. In the absence of a signal, 90% C.L. upper limits on the total flux were set for several theoretical models; these limits ranged from 20 to 130 nu_e bar cm^-2 s^-1. Additionally, an upper bound of 1.2 nu_e bar cm^-2 s^-1 was set for the supernova relic neutrino flux in the energy region E_nu > 19.3 MeV., Comment: 4 pages, 2 figures. Submitted to Physical Review Letters. New version includes corrections to Figure 1. Also, text has been shortened to conform with the space limitations of PRL

Published
2003

10. Search for nu(e) from the sun at Super-Kamiokande-I

Author

M. Ishitsuka, T. J. Haines, A. T. Suzuki, C. W. Walter, Shantanu Desai, Y. Ichikawa, R. Nishimura, Makoto Sakuda, J. Shirai, J. L. Stone, T. Inagaki, Hyosun Kim, Ken-ichiro Kobayashi, Yoshitaka Itow, K. Martens, Shigeki Tasaka, E. Sharkey, S. Dazeley, T. Shibata, A. L. Stachyra, M. Ackermann, E. Blaufuss, J. A. Goodman, M. D. Messier, D. W. Liu, M. Koike, Y. Fukuda, C. Mitsuda, G. Guillian, C. Mauger, D. Turcan, Y. Totsuka, Y. Takeuchi, Y. Kajiyama, K. Nishikawa, K. Nitta, A. Okada, M. L. Chen, H. G. Berns, M. Miura, S. Mine, R. J. Wilkes, Yuichi Oyama, M. Earl, A. K. Ichikawa, M. Goldhaber, L. R. Sulak, T. Ishii, Takehisa Hasegawa, K. Ishihara, M. Koshiba, Y. Nagashima, H. Takeuchi, Kazumasa Miyano, Hirokazu Ishino, S. Fukuda, M. B. Smy, Y. Hatakeyama, A. Gago, H. W. Sobel, John G. Learned, S. Nakayama, H. Okazawa, K. Kaneyuki, S. C. Boyd, T. Ishizuka, D. Takemori, S. Hatakeyama, M. Etoh, Magdalena Malek, K. S. Ganezer, R. W. Ellsworth, Mikio Morii, T. Kobayashi, Michitoshi Yoshida, Tomoyuki Maruyama, Takaaki Kajita, Kunio Inoue, Alec Habig, C. Saji, S. Matsuno, A. Kibayashi, G. W. Sullivan, Yasunari Suzuki, Y. Watanabe, David William Casper, Toshio Namba, C. Yanagisawa, W. Gajewski, Kate Scholberg, Nobuyuki Sakurai, T. Toshito, M. R. Vagins, K. Nishijima, M. Takita, J. Kameda, C. McGrew, M. Kohama, Y. Hayato, K. Nakamura, S. Moriyama, T. Ooyabu, Masayuki Nakahata, Yusuke Koshio, E. Kearns, A. Suzuki, R. Svoboda, Tsuyoshi Nakaya, Y. Gando, S. B. Kim, C. K. Jung, J. Yoo, W. E. Keig, Masato Shiozawa, T. Barszczak, J. Hill, B. Viren, D. Kielczewska, I. Kato, Y. Obayashi, W. R. Kropp, S. Yamada, and T. Iwashita

Subjects
Physics, Standard solar model, Particle physics, Solar neutrino, General Physics and Astronomy, Flux, Cosmic ray, Limit (mathematics), Monochromatic color, Neutrino, Super-Kamiokande
Abstract

We present the results of a search for low energy nu(e) from the Sun using 1496 days of data from Super-Kamiokande-I. We observe no significant excess of events and set an upper limit for the conversion probability to nu(e) of the 8B solar neutrino. This conversion limit is 0.8% (90% C.L.) of the standard solar model's neutrino flux for total energy=8-20 MeV. We also set a flux limit for monochromatic nu(e) for E(nu(e))=10-17 MeV.

Published
2002

11. Search for Nucleon Decay via Modes Favored by Supersymmetric Grand Unification Models in Super-Kamiokande-I

Author

Masatoshi Koshiba, Shoei Nakayama, Yuichi Oyama, A. Kibayashi, J. Ishii, K. Kaneyuki, J. Hill, Y. Gando, S. Matsuno, Yasunari Suzuki, Makoto Sakuda, Y. Takeuchi, Shinya Yamada, Toshio Namba, Y. Totsuka, Yusuke Koshio, R. Nambu, Mark R. Vagins, T. Ishizuka, H. Maesaka, M. Goldhaber, Taichi Morita, R. W. Ellsworth, A. Suzuki, M. Earl, Masashi Yokoyama, J. A. Goodman, R. Svoboda, Magdalena Malek, J. Zalipska, T. Harada, Tsuyoshi Nakaya, T. Ishida, C. McGrew, M. Ishitsuka, C. W. Walter, Y. Hayato, S. B. Kim, J. Y. Kim, J. Yoo, Shantanu Desai, Masato Shiozawa, Y. Choi, N. Tamura, T. Sasaki, J. L. Stone, L. R. Sulak, Henry W. Sobel, K. Nitta, Shoji Yamamoto, Koji Nakamura, A. Minamino, Kyoshi Nishijima, Michael B. Smy, T. Ooyabu, Masayuki Nakahata, Takaaki Kajita, H. Seo, Shigetaka Moriyama, Y. Fukuda, A. L. Stachyra, T. J. Haines, A. Sarrat, David William Casper, C. Mitsuda, J. Hosaka, A. K. Ichikawa, M. D. Messier, K. K. Shiraishi, D. W. Liu, C. Mauger, D. Takemori, K. Taki, A. Okada, H. G. Berns, J. Kameda, C. W. Sterner, D. Turcan, Y. Nakajima, K. Ishihara, T. Kobayashi, K. Hayashi, S. Ueda, T. Maruyama, Ko Okumura, John G. Learned, Y. Ashie, G. W. Sullivan, Katsuhiro Kobayashi, Kunio Inoue, J. S. Jang, K. Nishikawa, Y. Watanabe, S. Mine, T. Toshito, J. P. Cravens, W. R. Kropp, G. Guillian, T. Iwashita, S. Likhoded, Yoshitaka Itow, Y. Kuno, T. Kato, C. K. Jung, Minoru Yoshida, D. Kielczewska, Kazumasa Miyano, K. S. Ganezer, I. Kato, Y. Obayashi, W. E. Keig, Y. Takenaga, Masaya Hasegawa, M. Miura, K. Washburn, S. Hatakeyama, R. Gran, E. Blaufuss, C. Yanagisawa, Atsumu Suzuki, E. Kearns, T. Nakadaira, Takehisa Hasegawa, C. Saji, Hirokazu Ishino, W. Wang, H. Okazawa, Alec Habig, J. Shirai, Shigeki Tasaka, E. Sharkey, S. Dazeley, W. Gajewski, Kate Scholberg, T. Ishii, R. J. Wilkes, and I. T. Lim

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Supersymmetry, High Energy Physics - Experiment, Particle decay, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Mass spectrum, Grand Unified Theory, High Energy Physics::Experiment, Neutron, Neutrino, Nucleon, Super-Kamiokande
Abstract

We report the results for nucleon decay searches via modes favored by supersymmetric grand unified models in Super-Kamiokande. Using 1489 days of full Super-Kamiokande-I data, we searched for $p \to \bar{\nu} K^+$, $n \to \bar{\nu} K^0$, $p \to \mu^+ K^0$ and $p \to e^+ K^0$ modes. We found no evidence for nucleon decay in any of these modes. We set lower limits of partial nucleon lifetime 2.3$\times10^{33}$, 1.3$\times10^{32}$, 1.3$\times10^{33}$ and 1.0$\times10^{33}$ years at 90% confidence level for $p \to \bar{\nu} K^+$, $n \to \bar{\nu} K^0$, $p \to \mu^+ K^0$ and $p \to e^+ K^0$ modes, respectively. These results give a strong constraint on supersymmetric grand unification models., Comment: 14 pages, 13 figures

Published
2005

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