Author: "R. Enomoto" / Database: OpenAIRE - Searchworks@Jio Institute Digital Library Search Results

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80 results on '"R. Enomoto"'

1. Observation of Very High Energy Gamma Rays from HESS J1804−216 with CANGAROO‐III Telescopes

Author: Y. Higashi, H. Kubo, T. Yoshida, R. Enomoto, T. Tanimori, P. G. Edwards, T. Naito, G. V. Bicknell, R. W. Clay, S. Gunji, S. Hara, T. Hara, T. Hattori, S. Hayashi, Y. Hirai, K. Inoue, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, J. Kushida, Y. Matsubara, T. Mizukami, Y. Mizumoto, R. Mizuniwa, M. Mori, H. Muraishi, Y. Muraki, T. Nakamori, S. Nakano, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, E. Yamazaki, S. Yanagita, T. Yoshikoshi, and Y. Yukawa
Subjects: Physics, High energy, Photon, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Hadron, Gamma ray, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics, Radiation, Pulsar wind nebula, Space and Planetary Science, High Energy Physics::Experiment, Supernova remnant
Abstract: We observed the unidentified TeV gamma-ray source HESS J1804-216 with the CANGAROO-III atmospheric Cerenkov telescopes from May to July in 2006. We detected very high energy gamma rays above 600 GeV at the 10 sigma level in an effective exposure of 76 hr. We obtained a differential flux of (5.0+/-1.5_{stat}+/-1.6_{sys})\times 10^{-12}(E/1 TeV)^{-\alpha} cm^{-2}s^{-1}TeV^{-1} with a photon index \alpha of 2.69 +/- 0.30_{stat} +/- 0.34_{sys}, which is consistent with that of the H.E.S.S. observation in 2004. We also confirm the extended morphology of the source. By combining our result with multi-wavelength observations, we discuss the possible counterparts of HESS J1804-216 and the radiation mechanism based on leptonic and hadronic processes for a supernova remnant and a pulsar wind nebula., Comment: 11 pages, 12 figures, Accepted in ApJ
Published: 2008

2. Observation of an Extended Very High Energy Gamma‐Ray Emission from MSH 15‐52 with CANGAROO‐III

Author: T. Nakamori, H. Kubo, T. Yoshida, T. Tanimori, R. Enomoto, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, S. Hayashi, Y. Higashi, Y. Hirai, K. Inoue, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, J. Kushida, Y. Matsubara, T. Mizukami, Y. Mizumoto, R. Mizuniwa, M. Mori, H. Muraishi, Y. Muraki, T. Naito, S. Nakano, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, E. Yamazaki, S. Yanagita, T. Yoshikoshi, and Y. Yukawa
Subjects: Physics, High energy, Photon, Astrophysics::High Energy Astrophysical Phenomena, Gamma ray, Flux, Astronomy and Astrophysics, Astrophysics, Cherenkov Telescope Array, Pulsar, Space and Planetary Science, High Energy Physics::Experiment, Spectral analysis, Supernova remnant
Abstract: We have observed the supernova remnant MSH 15-52 (G320.4-1.2), which contains the gamma-ray pulsar PSR B1509-58, using the CANGAROO-III imaging atmospheric Cherenkov telescope array from April to June in 2006. We detected gamma rays above 810 GeV at the 7 sigma level during a total effective exposure of 48.4 hours. We obtained a differential gamma-ray flux at 2.35 TeV of (7.9+/-1.5_{stat}+/-1.7_{sys}) \times 10^{-13} cm^{-2}s^{-1}TeV^{-1} with a photon index of 2.21+/-0.39_{stat}+/-0.40_{sys}, which is compatible with that of the H.E.S.S. observation in 2004. The morphology shows extended emission compared to our Point Spread Function. We consider the plausible origin of the high energy emission based on a multi-wavelength spectral analysis and energetics arguments.
Published: 2008

3. CANGAROO‐III Search for Gamma Rays from SN 1987A and the Surrounding Field

Author: R. Enomoto, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hattori, S. Hayashi, Y. Higashi, Y. Hirai, K. Inoue, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, J. Kushida, T. Mizukami, R. Mizuniwa, M. Mori, H. Muraishi, T. Naito, T. Nakamori, S. Nakano, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, T. Tanimori, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, E. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi, and Y. Yukawa
Subjects: Shock wave, Physics, Brightness, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics, Charged particle, Supernova, Pulsar, Space and Planetary Science, Astrophysics::Solar and Stellar Astrophysics, Supernova remnant, Astrophysics::Galaxy Astrophysics
Abstract: Optical images of SN 1987A show a triple ring structure. The inner (dust) ring has recently increased in brightness and in the number of hot spots suggesting that the supernova shock wave has collided with the dense pre-existing circumstellar medium, a scenario supported by radio and X-ray observations. Such a shocked environment is widely expected to result in the acceleration of charged particles, and the accompanying emission of very high energy gamma-rays. Here, we report the results of observations made in 2004 and 2006 which yield upper limits on the TeV gamma-ray flux, which are compared with a theoretical prediction. In addition, we set upper limits on the TeV flux for four high energy objects which are located within the same field of view of the observation: the super-bubble 30 Dor C, the Crab-like pulsar PSR B0540$-$69, the X-ray binary LMC X-1, and the supernova remnant N157B., Comment: 5 pages, 5 figures, Accepted for publication in ApJ
Published: 2007

4. Detection of Gamma Rays around 1 TeV from RX J0852.0-4622 by CANGAROO-II

Author: H. Katagiri, R. Enomoto, L. T. Ksenofontov, M. Mori, Y. Adachi, A. Asahara, G. V. Bicknell, R. W. Clay, Y. Doi, P. G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, Sei. Hayashi, C. Itoh, S. Kabuki, F. Kajino, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, T. Kurihara, R. Kurosaka, J. Kushida, Y. Matsubara, Y. Miyashita, Y. Mizumoto, H. Muraishi, Y. Muraki, T. Naito, T. Nakamori, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, K. Okumura, J. R. Patterson, R. J. Protheroe, N. Sakamoto, Y. Sakamoto, D. L. Swaby, T. Tanimori, H. Tanimura, G. J. Thornton, K. Tsuchiya, S. Watanabe, T. Yamaoka, S. Yanagita, T. Yoshida, and T. Yoshikoshi
Subjects: Physics, Astrophysics (astro-ph), Gamma ray, Centroid, Flux, FOS: Physical sciences, Astronomy and Astrophysics, IACT, Astrophysics, Signal, law.invention, Telescope, Space and Planetary Science, law, Supernova remnant, Cherenkov radiation
Abstract: 著者人数: 51名, Accepted: 2004-12-10, 資料番号: SA1003414000
Published: 2005

5. Detection of Sub-TeV Gamma Rays from the Galactic Center Direction by CANGAROO-II

Author: K. Tsuchiya, R. Enomoto, L. T. Ksenofontov, M. Mori, T. Naito, A. Asahara, G. V. Bicknell, R. W. Clay, Y. Doi, P. G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, Sei. Hayashi, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, H. Kubo, T. Kurihara, R. Kurosaka, J. Kushida, Y. Matsubara, Y. Miyashita, Y. Mizumoto, H. Moro, H. Muraishi, Y. Muraki, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, K. Okumura, J. R. Patterson, R. J. Protheroe, N. Sakamoto, K. Sakurazawa, D. L. Swaby, T. Tanimori, H. Tanimura, G. Thornton, F. Tokanai, T. Uchida, S. Watanabe, T. Yamaoka, S. Yanagita, T. Yoshida, and T. Yoshikoshi
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Galactic Center, Astrophysics (astro-ph), Gamma ray, Flux, FOS: Physical sciences, Astronomy and Astrophysics, IACT, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Spectral line, High Energy Physics - Experiment, law.invention, Telescope, Galactic halo, High Energy Physics - Experiment (hep-ex), Space and Planetary Science, law, Cherenkov radiation, Astrophysics::Galaxy Astrophysics
Abstract: 著者人数: 51名, Accepted: 2004-03-24, 資料番号: SA1003408000
Published: 2004

6. A Search for TeV Gamma Rays from SN 1987A in 2001

Author: R. Enomoto, L. T. Ksenofontov, H. Katagiri, K. Tsuchiya, A. Asahara, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hara, H. Hattori, Sei. Hayashi, Shin. Hayashi, C. Itoh, S. Kabuki, F. Kajino, A. Kawachi, T. Kifune, H. Kubo, J. Kushida, Y. Matsubara, Y. Mizumoto, M. Mori, H. Moro, H. Muraishi, Y. Muraki, T. Naito, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, K. Okumura, J. R. Patterson, R. J. Protheroe, K. Sakurazawa, D. L. Swaby, T. Tanimori, F. Tokanai, H. Tsunoo, T. Uchida, A. Watanabe, S. Watanabe, S. Yanagita, T. Yoshida, and T. Yoshikoshi
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, Theoretical models, FOS: Physical sciences, Flux, Astronomy and Astrophysics, Astrophysics, Luminosity, law.invention, Telescope, Supernova, Space and Planetary Science, law, Cherenkov radiation, Zenith
Abstract: 著者人数: 46名, Accepted: 2003-05-20, 資料番号: SA1003406000
Published: 2003

7. The Belle detector

Author: A. Abashian, K. Gotow, N. Morgan, L. Piilonen, S. Schrenk, K. Abe, I. Adachi, J.P. Alexander, K. Aoki, S. Behari, Y. Doi, R. Enomoto, H. Fujii, Y. Fujita, Y. Funahashi, J. Haba, H. Hamasaki, T. Haruyama, K. Hayashi, Y. Higashi, N. Hitomi, S. Igarashi, Y. Igarashi, T. Iijima, Hirokazu Ikeda, Hitomi Ikeda, R. Itoh, M. Iwai, H. Iwasaki, Y. Iwasaki, K.K. Joo, K. Kasami, N. Katayama, M. Kawai, H. Kichimi, T. Kobayashi, S. Koike, Y. Kondo, M.H. Lee, Y. Makida, A. Manabe, T. Matsuda, T. Murakami, S. Nagayama, M. Nakao, T. Nozaki, K. Ogawa, R. Ohkubo, Y. Ohnishi, H. Ozaki, H. Sagawa, M. Saito, Y. Sakai, T. Sasaki, N. Sato, T. Sumiyoshi, J. Suzuki, J.I. Suzuki, S. Suzuki, F. Takasaki, K. Tamai, M. Tanaka, T. Tatomi, T. Tsuboyama, K. Tsukada, T. Tsukamoto, S. Uehara, N. Ujiie, S. Uno, B. Yabsley, Y. Yamada, H. Yamaguchi, H. Yamaoka, Y. Yamaoka, M. Yamauchi, Y. Yoshimura, H. Zhao, R. Abe, G. Iwai, T. Kawasaki, H. Miyata, K. Shimada, S. Takahashi, N. Tamura, H. Hanada, T. Nagamine, M. Nakajima, T. Nakajima, S. Narita, M. Sanpei, T. Takayama, M. Ueki, M. Yamaga, A. Yamaguchi, B.S. Ahn, J.S. Kang, Hyunwoo Kim, C.W. Park, H. Park, H.S. Ahn, H.K. Jang, C.H. Kim, S.K. Kim, S.H. Lee, C.S. Park, E. Won, H. Aihara, T. Higuchi, H. Kawai, T. Matsubara, T. Nakadaira, H. Tajima, J. Tanaka, T. Tomura, M. Yokoyama, M. Akatsu, K. Fujimoto, M. Hirose, K. Inami, A. Ishikawa, S. Itami, T. Kani, T. Matsumoto, I. Nagai, T. Okabe, T. Oshima, K. Senyo, A. Sugi, A. Sugiyama, S. Suitoh, M. Tomoto, K. Yoshida, R. Akhmetshin, P. Chang, Y. Chao, Y.Q. Chen, W.S. Hou, S.C. Hsu, H.C. Huang, T.J. Huang, M.C. Lee, R.S. Lu, J.C. Peng, K.C. Peng, S. Sahu, H.F. Sung, K.L. Tsai, K. Ueno, C.C. Wang, M.Z. Wang, G. Alimonti, T.E. Browder, B.C.K. Casey, F. Fang, H. Guler, M. Jones, Y. Li, S.L. Olsen, M. Peters, J.L. Rodriguez, M. Rosen, S. Swain, K. Trabelsi, G. Varner, H. Yamamoto, Y.H. Zheng, Q. An, H.F. Chen, Y.F. Wang, Z.Z. Xu, S.W. Ye, Z.P. Zhang, M. Asai, Y. Asano, S. Mori, S. Stanič, Y. Tsujita, J. Zhang, D. Žontar, T. Aso, V. Aulchenko, D. Beiline, A. Bondar, L. Dneprovsky, S. Eidelman, A. Garmash, A. Kuzmin, L. Romanov, N. Root, B. Shwartz, A. Sidorov, V. Sidorov, Y. Usov, V. Zhilich, A.M. Bakich, L.S. Peak, K.E. Varvell, E. Banas, A. Bozek, P. Jalocha, P. Kapusta, Z. Natkaniec, W. Ostrowicz, H. Palka, M. Rozanka, K. Rybicki, P.K. Behera, A. Mohapatra, M. Satapathy, Y.H. Chang, H.S. Chen, L.Y. Dong, J. Li, H.M. Liu, Z.P. Mao, C.X. Yu, C.C. Zhang, S.Q. Zhang, Z.G. Zhao, Z.P. Zheng, B.G. Cheon, Y. Choi, D.W. Kim, J.W. Nam, S. Chidzik, K. Korotuschenko, C. Leonidopoulos, T. Liu, D. Marlow, C. Mindas, E. Prebys, R. Rabberman, W. Sands, R. Wixted, S. Choi, J. Dragic, C.W. Everton, A. Gordon, N.C. Hastings, E.M. Heenan, L.C. Moffitt, G.R. Moloney, G.F. Moorhead, M.E. Sevior, G.N. Taylor, S.N. Tovey, A. Drutskoy, R. Kagan, P. Pakhlov, S. Semenov, C. Fukunaga, R. Suda, M. Fukushima, V.I. Goriletsky, B.V. Grinyov, V.R. Lyubinsky, A.I. Panova, K.V. Shakhova, L.I. Shpilinskaya, E.L. Vinograd, B.G. Zaslavsky, R.S. Guo, F. Haitani, Y. Hoshi, K. Neichi, K. Hara, T. Hara, M. Hazumi, T. Hojo, D. Jackson, H. Miyake, Y. Nagashima, J. Ryuko, K. Sumisawa, M. Takita, T. Yamanaka, H. Hayashii, K. Miyabayashi, S. Noguchi, S. Hikita, H. Hirano, K. Hoshina, H. Mamada, O. Nitoh, N. Okazaki, T. Yokoyama, H. Ishino, S. Ichizawa, T. Hirai, H. Kakuno, J. Kaneko, T. Nakamura, Y. Ohshima, Y. Watanabe, S. Yanaka, Y. Inoue, E. Nakano, T. Takahashi, Y. Teramoto, J.H. Kang, H.J. Kim, Heejong Kim, Y.-J. Kwon, E. Kurihara, T. Ooba, K. Suzuki, Y. Unno, N. Kawamura, H. Yuta, K. Kinoshita, A. Satpathy, S. Kobayashi, T. Kuniya, A. Murakami, S. Kumar, J. Singh, J. Lange, R. Stock, S. Matsumoto, M. Watanabe, H. Matsuo, S. Nishida, T. Nomura, H. Sakamoto, N. Sasao, Y. Ushiroda, Y. Nagasaka, Y. Tanaka, S. Ogawa, H. Shibuya, K. Hanagaki, S. Okuno, D.Z. Shen, D.S. Yan, Z.W. Yin, N. Tan, C.H. Wang, T. Yamaki, and Y. Yamashita
Subjects: Physics, Nuclear and High Energy Physics, Spectrometer, Meson, Physics::Instrumentation and Detectors, Detector, Particle detector, Particle identification, Belle experiment, Semiconductor detector, Nuclear physics, KEKB, Computer Science::Programming Languages, Physics::Accelerator Physics, High Energy Physics::Experiment, Instrumentation
Abstract: The BELLE detector for experiments at KEKB, a high luminosity, energy asymmetric B-factory, is now being constructed at KEK. An overview of the detector systems and their status is presented.
Published: 2002

8. New solar cell and clean unit system platform (CUSP) for earth and environmental science

Author: Akira Ishibashi, R Enomoto, M Yasutake, and Takashi Matsuoka
Subjects: 010302 applied physics, Cusp (singularity), Engineering, Photon, business.industry, Energy conversion efficiency, 02 engineering and technology, Geophysics, 01 natural sciences, law.invention, Optics, Semiconductor, Orthogonality, law, 0103 physical sciences, Solar cell, 0202 electrical engineering, electronic engineering, information engineering, Environmental science, 020201 artificial intelligence & image processing, Electricity, business, Absorption (electromagnetic radiation)
Abstract: We have investigated InGaN-based multi-striped orthogonal photon-photocarrier propagation solar cell (MOP3SC) in which sunlight propagates in a direction being orthogonal to that of photocarriers generated by the sunlight. Thanks to the orthogonality, in MOP3SC, absorption of the sunlight and collection of the photocarriers can be simultaneously and independently optimized with no trade-off. Furthermore, by exploiting the degree of freedom along the photon propagation and using multi-semiconductor stripes in which the incoming photons first encounter the widest gap semiconductor, and the narrowest at last, we can convert the whole solar spectrum into electricity resulting in the high conversion efficiency. For processing MOP3SC, we have developed Clean Unit System Platform (CUSP), which turns out to be able to serve as clean versatile environment having low power-consumption and high cost-performance. CUSP is suitable not only for processing devices, but also for cross-disciplinary fields, including medical/hygienic applications.
Published: 2017

9. Design study of CANGAROO-III, stereoscopic imaging atmospheric Cherenkov telescopes for sub-TeV γ-ray detection

Author: R Enomoto, S Hara, A Asahara, G.V Bicknell, P.G Edwards, S Gunji, T Hara, J Jimbo, F Kajino, H Katagiri, J Kataoka, A Kawachi, T Kifune, H Kubo, J Kushida, Y Matsubara, Y Mizumoto, M Mori, M Moriya, H Muraishi, Y Muraki, T Naito, T Nakase, K Nishijima, K Okumura, J.R Patterson, K Sakurazawa, D.L Swaby, K Takano, T Tanimori, T Tamura, K Tsuchiya, K Uruma, S Yanagita, T Yoshida, T Yoshikoshi, and A Yuki
Subjects: Stereoscopic imaging, Physics, Pixel, business.industry, Astrophysics::High Energy Astrophysical Phenomena, Monte Carlo method, Astrophysics::Instrumentation and Methods for Astrophysics, Gamma ray, Astronomy and Astrophysics, IACT, Astrophysics, law.invention, Telescope, Optics, law, Design study, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, business, Astrophysics::Galaxy Astrophysics, Cherenkov radiation
Abstract: CANGAROO-III is an Imaging Atmospheric Cherenkov Telescope (IACT) array of four 10 m telescopes for very high energy (sub-TeV) gamma-ray astronomy. A design study of the CANGAROO-III telescope system was carried out using the Monte Carlo technique in order to optimize the pixel size and the telescope spacing. Studies were also made of observations at low elevation angles.
Published: 2002

10. A measurement of the branching fraction for the inclusive B→Xγ decays with the Belle detector

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A.M. Bakich, E. Banas, W. Bartel, S. Behari, P.K. Behera, D. Beiline, A. Bondar, A. Bozek, T.E. Browder, B.C.K. Casey, P. Chang, Y. Chao, B.G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, T. Haruyama, N.C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E.M. Heenan, Y. Higasino, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D.J. Jackson, P. Jalocha, H.K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J.H. Kang, J.S. Kang, P. Kapusta, N. Katayama, H. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D.W. Kim, Heejong Kim, H.J. Kim, Hyunwoo Kim, S.K. Kim, K. Kinoshita, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J.S. Lange, M.H. Lee, S.H. Lee, H.B. Li, D. Liventsev, R.-S. Lu, A. Manabe, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L.C. Moffitt, G.R. Moloney, G.F. Moorhead, S. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, J.W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S.L. Olsen, W. Ostrowicz, H. Ozaki, H. Palka, C.S. Park, C.W. Park, H. Park, L.S. Peak, M. Peters, L.E. Piilonen, E. Prebys, J.L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M.E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J.B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, K. Suzuki, S. Suzuki, S.Y. Suzuki, S.K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G.N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S.N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S.E. Vahsen, G. Varner, K.E. Varvell, C.C. Wang, C.H. Wang, M.-Z. Wang, T.J. Wang, Y. Watanabe, E. Won, B.D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C.C. Zhang, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, KEKB, Branching fraction, Detector, Radiative transfer, Resonance, B meson, Storage ring, High Energy Physics - Experiment
Abstract: We have measured the branching fraction of the inclusive radiative B meson decay B --> X(s) gamma to be Br(B->X(s)gamma)=(3.36 +/- 0.53(stat) +/- 0.42(sys) +0.50-0.54(th)) x 10^{-4}. The result is based on a sample of 6.07 x 10^6 BBbar events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e^+e^- storage ring., Comment: 14 pages, 6 Postsript figures, uses elsart.cls
Published: 2001

11. Measurement ofBd0−B¯d0Mixing Rate from the Time Evolution of Dilepton Events at theϒ(4S)

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, S. Eidelman, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, Y. Fujita, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, T. Haji, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, Y. Inoue, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, K. Kasami, N. Katayama, H. Kawai, M. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Koike, S. Koishi, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, M. H. Lee, S. H. Lee, C. Leonidopoulos, H.-B. Li, R.-S. Lu, Y. Makida, A. Manabe, D. Marlow, T. Matsubara, T. Matsuda, S. Matsui, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, A. Mohapatra, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. Raaf, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, H. Sakaue, M. Satapathy, N. Sato, A. Satpathy, S. Schrenk, S. Semenov, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, V. Sidorov, S. Stanic̆, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, M.-Z. Wang, T. J. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamaguchi, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Z̆ontar
Subjects: Physics, Nuclear physics, Particle physics, KEKB, Muon, Mixing (mathematics), Time evolution, General Physics and Astronomy
Abstract: We report a determination of the ${B}_{d}^{0}\ensuremath{-}{\overline{B}}_{d}^{0}$ mixing parameter $\ensuremath{\Delta}{m}_{d}$ based on the time evolution of dilepton yields in $\ensuremath{\Upsilon}(4S)$ decays. The measurement is based on a $5.9{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing $\ensuremath{\Delta}{m}_{d}$ as a free parameter. Using both muons and electrons, we obtain $\ensuremath{\Delta}{m}_{d}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.463\ifmmode\pm\else\textpm\fi{}0.008(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.016(\mathrm{syst}){\mathrm{ps}}^{\ensuremath{-}1}$. This is the first determination of $\ensuremath{\Delta}{m}_{d}$ from time evolution measurements at the $\ensuremath{\Upsilon}(4S)$. We also place limits on possible $\mathrm{CPT}$ violations.
Published: 2001

12. Measurement of theCPViolation Parametersin2φ1inBd0Meson Decays

Author: A. Abashian, K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Aoki, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, Y. Doi, J. Dragic, A. Drutskoy, S. Eidelman, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, K. Fujimoto, Y. Fujita, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, T. Haji, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, T. Haruyama, N. C. Hastings, K. Hayashi, H. Hayashii, M. Hazumi, E. M. Heenan, Y. Higashi, Y. Higashino, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, M. Hirose, T. Hojo, Y. Hoshi, K. Hoshina, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y.-C. Huang, S. Ichizawa, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, Y. Inoue, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, M. Iwai, M. Iwamoto, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, K. Kasami, N. Katayama, H. Kawai, M. Kawai, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, S. Koike, S. Koishi, Y. Kondo, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, M. H. Lee, S. H. Lee, C. Leonidopoulos, H.-B. Li, R.-S. Lu, Y. Makida, A. Manabe, D. Marlow, T. Matsubara, T. Matsuda, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, A. Mohapatra, G. R. Moloney, G. F. Moorhead, N. Morgan, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, W. Ostrowicz, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, S. Saitoh, Y. Sakai, H. Sakamoto, H. Sakaue, M. Satapathy, N. Sato, A. Satpathy, S. Schrenk, S. Semenov, Y. Settai, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J. Suzuki, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, Y. Tsujita, T. Tsukamoto, S. Uehara, K. Ueno, N. Ujiie, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, M.-Z. Wang, T. J. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamaguchi, H. Yamamoto, T. Yamanaka, H. Yamaoka, Y. Yamaoka, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, H. W. Zhao, J. Zhang, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, Resonance, CP violation, High Energy Physics::Experiment, Standard Model
Abstract: We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ (also known as $\mathrm{sin}2\ensuremath{\beta}$) based on a $10.5{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is reconstructed in the $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$, $J/\ensuremath{\psi}{K}_{L}$, or $J/\ensuremath{\psi}{\ensuremath{\pi}}^{0}$ $\mathrm{CP}$-eigenstate decay channel and the flavor of the accompanying $B$ meson is identified from its charged particle decay products. From the asymmetry in the distribution of the time interval between the two $B$-meson decay points, we determine $\mathrm{sin}2{\ensuremath{\varphi}}_{1}{\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.58}_{\ensuremath{-}0.34}^{+0.32}(\mathrm{stat}{)}_{\ensuremath{-}0.10}^{+0.09}(\mathrm{syst})$.
Published: 2001

13. Measurement of the cross-section and forward-backward charge asymmetry for the b and c-quark in $e^+e^-$ annihilation with inclusive muons at $\sqrt{s} = 58$ GeV

Author: Y. Inoue, A. Miyamoto, E. Nakano, T. Takahashi, T. Tauchi, Y. Teramoto, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, R. Enomoto, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, N. Fujiwara, H. Hirano, B. Howell, H. Hayashii, N. Iida, H. Ikeda, S. Itami, R. Itoh, H. Iwasaki, M. Iwasaki, R. Kajikawa, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, H. Mamada, K. Miyabayashi, K. Muramatsu, K. Nagai, K. Nakabayashi, M. Nakamura, S. Noguchi, O. Nitoh, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, E. Shibata, A. Sugiyama, H. Sugiyama, S. Suzuki, K. Takahashi, T. Tanimori, M. Tomoto, T. Tsukamoto, T. Tsumura, S. Uno, Y. Watanabe, A. Yamamoto, and M. Yamauchi
Subjects: Quark, Physics, Particle physics, Annihilation, Muon, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), media_common.quotation_subject, Hadron, FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Asymmetry, High Energy Physics - Experiment, Standard Model, Charm quark, High Energy Physics - Experiment (hep-ex), High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, Engineering (miscellaneous), media_common
Abstract: We have studied inclusive muon events using all the data collected by the TOPAZ detector at sqrt(s)=58 GeV with an integrated luminosity of 273pb-1. From 1328 inclusive muon events, we measured the ratio R_qq of the cross section for qq-bar production to the total hadronic cross section and forward-backward asymmetry A^q_FB for b and c quarks. The obtained results are R_bb = 0.13+-0.02(stat)+-0.01(syst), R_cc = 0.36+-0.05(stat)+-0.05(syst), A^b_FB = -0.20+-0.16(stat)+-0.01(syst) and A^c_FB = -0.17+-0.14(stat)+-0.02(syst), in fair agreement with a prediction of the standard model., Comment: To be published in EPJ C. 24 pages, 12 figures
Published: 2000

14. Measurement of the jet width in γγ collisions and in e+e− annihilation process at TRISTAN

Author: K. Adachi, H. Hayashii, K. Miyabayashi, S. Noguchi, A. Miyamoto, T. Tauchi, K. Abe, T. Abe, I. Adachi, M. Aoki, R. Enomoto, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, N. Fujiwara, H. Hirano, B. Howell, N. Iida, H. Ikeda, Y. Inoue, S. Itami, R. Itoh, H. Iwasaki, M. Iwasaki, R. Kajikawa, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, H. Mamada, K. Muramatsu, K. Nagai, K. Nakabayashi, M. Nakamura, E. Nakano, O. Nitoh, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, E. Shibata, A. Sugiyama, H. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, Y. Teramoto, M. Tomoto, T. Tsukamoto, T. Tsumura, S. Uno, Y. Watanabe, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear and High Energy Physics, Jet (fluid), Particle physics, Annihilation, Astrophysics::High Energy Astrophysical Phenomena, HERA, law.invention, Transverse plane, law, High Energy Physics::Experiment, Nuclear Experiment, Collider, Scaling, Energy (signal processing), Bar (unit)
Abstract: The shape of jets produced in (quasi-) real photon-photon collisions as well as in e^+e^- annihilation process has been studied with a cone jet finding algorithm, using the data taken with the TOPAZ detector at the TRISTAN e^+e^- collider at an average center-of-mass energy of 58 GeV. The results are presented in terms of the jet width as a function of the jet transverse energy(E^{jet}_T) as well as a scaled transverse jet energy, x_T(=2E^{jet}_T/root(s)). The jet width narrows as E^{jet}_T increases; however, at the same value of E^{jet}_T the jet width in gamma-gamma collisions at TRISTAN is significantly narrower than that in gamma p collisions at HERA. By comparing our results with the data in other reactions, it has been shown that the jet width in gamma-gamma, gamma p, p\bar{p} collisions as well as the e^+e^- annihilation process has an approximate scaling behavior as a function of x_T.
Published: 1999

15. Study of baryon production mechanism in e+e− annihilation into hadrons

Author: M. Aoki, R. Itoh, Y. Watanabe, K. Kaneyuki, Y. Ohshima, A. Ochi, T. Tanimori, K. Abe, T. Abe, I. Adachi, K. Adachi, K. Emi, R. Enomoto, H. Fujii, T. Fujii, K. Fujii, J. Fujimoto, N. Fujiwara, H. Hayashii, H. Hirano, B. Howell, H. Ikeda, Y. Inoue, S. Itami, H. Iwasaki, M. Iwasaki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, H. Mamada, K. Miyabayashi, A. Miyamoto, K. Nagai, K. Nakabayashi, M. Nakamura, E. Nakano, O. Nitoh, S. Noguchi, F. Ochiai, N. Ohishi, Y. Ohnishi, H. Okuno, T. Okusawa, E. Shibata, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, Y. Teramoto, T. Tauchi, M. Tomoto, T. Tsukamoto, T. Tsumura, S. Uno, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Context (language use), engineering.material, law.invention, Nuclear physics, Diquark, Topaz, Baryon, Pair production, law, engineering, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract: The mechanism of baryon-anti-baryon pair production in e + e − annihilation into hadrons has been studied using the TOPAZ detector at the TRISTAN e + e − collider at an average center-of-mass energy of 58 GeV. The distributions of various p p correlations were compared with two prominent models: the cluster-fragmentation model and the string-fragmentation model. We rejected the cluster-fragmentation model at the 90% C.L. Furthermore, in the context of the string-fragmentation model, we favor the “popcorn” model, rejecting the “diquark” model, where a diquark is considered to be a fundamental entity, at the 95% C.L.
Published: 1998

16. Monte-Carlo simulation for an aerogel Cherenkov counter

Author: R Suda, M Watanabe, R Enomoto, T Iijima, I Adachi, H Hattori, T Kuniya, T Ooba, T Sumiyoshi, and Y Yoshida
Subjects: Physics, Nuclear and High Energy Physics, Photomultiplier, Particle physics, Photon, Physics::Instrumentation and Detectors, Monte Carlo method, FOS: Physical sciences, Aerogel, High Energy Physics - Experiment, Computational physics, Magnetic field, High Energy Physics - Experiment (hep-ex), Code (cryptography), High Energy Physics::Experiment, Instrumentation, Cherenkov radiation, Free parameter
Abstract: We have developed a Monte-Carlo simulation code for an aerogel \v Cerenkov Counter which is operated under a strong magnetic field such as 1.5T. This code consists of two parts: photon transportation inside aerogel tiles, and one-dimensional amplification in a fine-mesh photomultiplier tube. It simulates the output photoelectron yields as accurately as 5% with only a single free parameter. This code is applied to simulations for a B-Factory particle-identification system., Comment: 40 pages, latex(article), 19 figures
Published: 1998

17. Charged-particle multiplicities of quark and gluon jets in e+ e− annihilation at TRISTAN

Author: K. Nakabayashi, M. Yamauchi, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, K. Emi, R. Enomoto, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, N. Fujiwara, H. Hayashii, B. Howell, H. Ikeda, Y. Inoue, R. Itoh, S. Itami, H. Iwasaki, M. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, K. Miyabayashi, A. Miyamoto, K. Nagai, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, M. Tomoto, T. Tsukamoto, S. Uno, Y. Watanabe, and A. Yamamoto
Subjects: Quark, Physics, Topaz, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, engineering, Multiplicity (mathematics), engineering.material, Charged particle, Gluon
Abstract: Charged-particle multiplicity was studied in e+e− annihilation at s = 57.8 GeV using the TOPAZ detector at TRISTAN. The average multiplicity was 〈nch〉 = 17.64± 0.05(stat.) ± 0.41(syst.). It was found that the multiplicity depends on the thrust (T) of an event. From extrapolating this relation to T = 2 3 , the multiplicity for three-fold symmetric events was estimated to be 〈n ch 〉 T = 2 3 = 23.50 −1.45 +1.25 . From this, the multiplicity ratio between gluon- and quark-jet was estimated to be r g q = 1.46 −0.13 +0.09 without any possible bias from jet clustering.
Published: 1997

18. Measurement of the Electromagnetic Coupling at Large Momentum Transfer

Author: I. Levine, D. Koltick, B. Howell, E. Shibata, J. Fujimoto, T. Tauchi, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, K. Emi, R. Enomoto, H. Fujii, K. Fujii, T. Fujii, N. Fujiwara, H. Hayashii, H. Hirano, H. Ikeda, Y. Inoue, S. Itami, R. Itoh, H. Iwasaki, M. Iwasaki, R. Kajikawa, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, H. Mamada, K. Miyabayashi, A. Miyamoto, K. Nagai, K. Nakabayashi, M. Nakamura, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, Y. Teramoto, M. Tomoto, T. Tsukamoto, T. Tsumura, S. Uno, K. Watanabe, Y. Watanabe, A. Yamamoto, and M. Yamauchi
Subjects: Coupling constant, Physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, Momentum transfer, General Physics and Astronomy, Electromagnetic coupling, Atomic physics, Coupling (probability), Energy (signal processing)
Abstract: We report the first purely electroweak measurement of the strengthening of the electromagnetic coupling, {alpha}{sub QED} with increasing momentum transfer Q{sup 2}, by comparing the process e{sup +}e{sup -}{r_arrow}{mu}{sup +}{mu}{sup -} with the process e{sup +}e{sup -}{r_arrow}e{sup +}e{sup -}{mu}{sup +}{mu}{sup -}. The data were accumulated at an average center-of-mass energy {l_angle}{radical}(s){r_angle}=57.77GeV using the TOPAZ detector at the TRISTAN e{sup +}e{sup -} collider. We measure {alpha}{sup -1}{sub QED}(Q{sup 2}) to change from its known value of {alpha}{sup -1}{sub QED}{congruent} 137.0 at Q{sup 2}=0to1 28.5{plus_minus}1.8(stat){plus_minus}0.7(syst) at Q{sup 2}=(57.77GeV/c){sup 2}. This result agrees with electroweak predictions. {copyright} {ital 1997} {ital The American Physical Society}
Published: 1997

19. A study of single photon production in e+e− collisions at GeV with the TOPAZ detector at TRISTAN

Author: T. Abe, K. Fujii, A. Sugiyama, J. Fujimoto, T. Tauchi, S. Suzuki, R. Kajikawa, K. Adachi, K. Abe, I. Adachi, M. Aoki, K. Emi, R. Enomoto, H. Fujii, T. Fujii, N. Fujiwara, H. Hayashii, H. Hirano, B. Howell, H. Ikeda, Y. Inoue, R. Itoh, S. Itami, H. Iwasaki, M. Iwasaki, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, H. Mamada, K. Miyabayashi, A. Miyamoto, K. Nagai, K. Nakabayashi, E. Nakano, M. Nakamura, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, E. Shibata, K. Takahashi, T. Takahashi, T. Tanimori, Y. Teramoto, M. Tomoto, T. Tsukamoto, T. Tsumura, S. Uno, K. Watanabe, Y. Watanabe, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Detector, engineering.material, Massless particle, Nuclear physics, Topaz, Event selection, Selectron tube, engineering, Photino
Abstract: We report a study of single photon production in e+e− collisions at s =58 GeV with the TOPAZ detector at TRISTAN. From data corresponding to an integrated luminosity of 213 pb−1, 5 single photon candidates remained after event selection, which can be compared with the expected 3.1 ν ν γ and 2.8 background events. These results exclude the selectron mass below 47.2 GeV at the 90% confidence level, if e L and e R are mass-degenerate and the photino is massless. When combined with results from other experiments, this limit improves to 75.0 GeV.
Published: 1995

20. Observation of excess Λ() production in two-photon processes at TRISTAN

Author: R. Enomoto, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, S. Awa, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, N. Fujiwara, H. Hayashii, B. Howell, N. Iida, R. Itoh, Y. Inoue, H. Iwasaki, M. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Muramatsu, K. Nagai, K. Nakabayashi, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, N. Toomi, T. Tsukamoto, O. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Bar (music), Generator (category theory), Production (computer science), Lambda
Abstract: We have carried out inclusive measurements of $\Lambda(\bar{\Lambda})$ production in two-photon processes at TRISTAN. The mean $\sqrt{s}$ was 58 GeV and the integrated luminosity was 265 pb$^{-1}$. Inclusive $\Lambda (\bar{\Lambda})$ samples were obtained under such conditions as no-electron, anti-electron, and remnant-jet tags. The data were compared with theoretical calculations. The measured cross sections are two-times larger than the leading-order theoretical predictions, suggesting the necessity of next-to-leading-order Monte-Carlo generator.
Published: 1995

21. Measurement of the total hadronic cross section and determination of γ-Z interference in e+e− annihilation

Author: K. Miyabayashi, I. Adachi, K. Fujii, J. Fujimoto, A. Miyamoto, A. Sugiyama, S. Suzuki, T. Tauchi, K. Abe, T. Abe, K. Adachi, M. Aoki, S. Awa, K. Emi, R. Enomoto, H. Fujii, T. Fujii, K. Fujita, N. Fujiwara, H. Hayashii, B. Howell, N. Iida, H. Ikeda, R. Itoh, Y. Inoue, H. Iwasaki, M. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Muramatsu, K. Nagai, K. Nakabayashi, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, K. Takahashi, T. Takahashi, T. Tanimori, Y. Teramoto, N. Toomi, T. Tsukamoto, O. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Topaz, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Annihilation, Luminosity (scattering theory), Hadron, engineering, engineering.material, Interference (wave propagation)
Abstract: The total hadronic cross section in e + e − annihilation was measured at s =5.77 GeV to be σ h = 143.6 ± 1.5 (stat) ± 3.5 (sys) pb with only the QED corrections. The measurement was based on data corresponding to an integrated luminosity of 90.8 pb −1 accumulated by the TOPAZ detector at TRISTAN. Our data point put stringent constraints on the size of the γ - Z 0 interference and the Z 0 mass. Combining our data with the OPAL data at LEP, we obtained the coefficient of the interference and the Z 0 mass to be J had = 0.10 ± 0.26 and M z = 91.151 ± 0.008 GeV, respectively, in a model-independent analysis.
Published: 1995

22. Measurement of inclusive particle spectra and test of MLLA prediction in e+e− annihilation at

Author: R. Itoh, M. Yamauchi, A. Yamaguchi, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, S. Awa, K. Emi, R. Enomoto, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, N. Fujiwara, H. Hayashii, B. Howell, N. Iida, Y. Inoue, H. Iwasaki, M. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Muramatsu, K. Nagai, K. Nakabayashi, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, N. Toomi, T. Tsukamoto, O. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, and A. Yamamoto
Subjects: Quantum chromodynamics, Physics, Momentum, Nuclear and High Energy Physics, Particle physics, Annihilation, Hadron, High Energy Physics::Experiment, Charged particle, Spectral line, Energy (signal processing), Bar (unit)
Abstract: Inclusive momentum spectra are measured for all charged particles and for each of $\pi^{\pm}$, $K^{\pm}$, $K^0/\bar{K^0}$, and $p/\bar{p}$ in hadronic events produced via $e^+e^-$ annihilation at $\sqrt{s}$=58GeV . The measured spectra are compared with QCD predictions based on the modified leading log approximation(MLLA). The MLLA model reproduces the measured spectra well. The energy dependence of the peak positions of the spectra is studied by comparing the measurements with those at other energies. The energy dependence is also well described by the MLLA model.
Published: 1995

23. k0 (K̄0) production in two-photon processes at TRISTAN

Author: R. Enomoto, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, S. Awa, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, N. Fujiwara, H. Hayashii, B. Howell, N. Iida, R. Itoh, Y. Inoue, H. Iwasaki, M. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Muramatsu, K. Nagai, K. Nakabayashi, E. Nakano, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, N. Toomi, T. Tsukamoto, O. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear physics, High Energy Physics - Experiment (hep-ex), Nuclear and High Energy Physics, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, FOS: Physical sciences, High Energy Physics::Experiment, Production (computer science), Measure (mathematics), High Energy Physics - Experiment
Abstract: We have carried out an inclusive measurement of $K^0(\bar{K^0})$ production in two-photon processes at TRISTAN. The mean $\sqrt{s}$ was 58 GeV and the integrated luminosity was 199 pb$^{-1}$. High-statistics $K_s$ samples were obtained under such conditions as no-, anti-electron, and remnant-jet tags. The remnant-jet tag, in particular, allowed us, for the first time, to measure the cross sections separately for the resolved-photon and direct processes., Comment: 20 pages, Latex format, 4 figures and KEK-mark included. Table 1 revised. To be published in Phys. Lett. B
Published: 1994

24. Measurement of the forward-backward asymmetries for charm- and bottom-quark pair productions at with electron tagging

Author: E. Nakano, R. Enomoto, M. Iwasaki, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, S. Awa, R. Belusevic, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, N. Fujiwara, H. Hayashii, B. Howell, N. Iida, H. Ikeda, R. Itoh, Y. Inoue, H. Iwasaki, K. Kaneyuki, R. Kajikawa, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Muramatsu, K. Nagai, K. Nakabayashi, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, N. Toomi, T. Tsukamoto, O. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Topaz, Physics, Nuclear and High Energy Physics, Particle physics, Detector, Hadron, engineering, Forward backward, Electron, Charm (quantum number), engineering.material, Bottom quark, Standard Model
Abstract: We have measured, with electron tagging, the forward-backward asymmetries of charm- and bottom-quark pair productions at $ $=58.01GeV, based on 23,783 hadronic events selected from a data sample of 197pb$^{-1}$ taken with the TOPAZ detector at TRISTAN. The measured forward-backward asymmetries are $A_{FB}^c = -0.49 \pm 0.20(stat.) \pm 0.08 (sys.)$ and $A_{FB}^b = -0.64 \pm 0.35(stat.) \pm 0.13 (sys.)$, which are consistent with the standard model predictions.
Published: 1994

25. Measurement of inclusive electron cross section in γγ collisions at TRISTAN

Author: M. Iwasaki, R. Enomoto, H. Hayashii, E. Nakano, K. Abe, T. Abe, I. Adachi, K. Adachi, M. Aoki, S. Awa, K. Emi, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, N. Fujiwara, B. Howell, N. Iida, H. Ikeda, Y. Inoue, R. Itoh, H. Iwasaki, R. Kajikawa, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Muramatsu, K. Nagai, K. Nakabayashi, O. Nitoh, S. Noguchi, A. Ochi, F. Ochiai, N. Ohishi, Y. Ohnishi, Y. Ohshima, H. Okuno, T. Okusawa, T. Shinohara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, T. Tanimori, T. Tauchi, Y. Teramoto, N. Toomi, T. Tsukamoto, T. Tsumura, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Phenomenology, Hadron, Order (ring theory), Electron, law.invention, Gluon, Charm quark, Positron, law, High Energy Physics::Experiment, Nuclear Experiment, Collider
Abstract: We have studied open charm production in $\gamma \gamma$ collisions with the TOPAZ detector at the TRISTAN $e^{+}e^{-}$ collider. In this study, charm quarks were identified by electrons (and positrons) from semi-leptonic decays of charmed hadrons. The data corresponded to an integrated luminosity of 95.3 pb$^{-1}$ at a center-of-mass energy of 58 GeV. The results are presented as the cross sections of inclusive electron production in $\gamma \gamma$ collisions with an anti-tag condition, as well as the subprocess cross sections, which correspond to resolved-photon processes. The latter were measured by using a sub-sample with remnant jets. A comparison with various theoretical predictions based on direct and resolved-photon processes showed that our data prefer that with relatively large gluon contents in a photon at small $x (x \le 0.1)$, with the next-to-leading order correction, and with a charm-quark mass of 1.3 GeV.
Published: 1994

26. Measurement of the photon structure function F2γ and jet production at TRISTAN

Author: K. Muramatsu, H. Hayashii, S. Noguchi, N. Fujiwara, K. Abe, T. Abe, I. Adachi, M. Aoki, S. Awa, R. Belusevic, K. Emi, R. Enomoto, H. Fujii, K. Fujii, T. Fujii, J. Fujimoto, K. Fujita, B. Howell, N. Iida, H. Ikeda, R. Itoh, H. Iwasaki, M. Iwasaki, R. Kajikawa, K. Kaneyuki, S. Kato, S. Kawabata, H. Kichimi, M. Kobayashi, D. Koltick, I. Levine, S. Minami, K. Miyabayashi, A. Miyamoto, K. Nagai, T. Nagira, E. Nakano, K. Nakabayashi, O. Nitoh, F. Ochiai, Y. Ohnishi, H. Okuno, T. Okusawa, K. Shimozawa, T. Shinohara, A. Sugiyama, N. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, M. Takemoto, T. Tanimori, T. Tauchi, F. Teramae, Y. Teramoto, N. Toomi, T. Toyama, T. Tsukamoto, S. Uno, T. Watanabe, Y. Watanabe, A. Yamaguchi, A. Yamamoto, and M. Yamauchi
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Photon, Hadron, Detector, Jet (particle physics), engineering.material, Deep inelastic scattering, Photon structure function, Nuclear physics, Topaz, engineering, High Energy Physics::Experiment
Abstract: We have measured the photon structure function F2γ in the reaction e+e− → e+e− hadrons for average Q2 values from 5.1 to 338 GeV2 by using data collected by the TOPAZ detector at TRISTAN. The data have been corrected for detector effects and are compared with theoretical expectations based on QCD. The structure function F2γ increases as ln Q2, as expected. A sample of events with one or two distinct jets has been identified in the final state. Although two-jet events can be explained solely by the point-like perturbative part, one-jet events require a significant hadron-like part in addition.
Published: 1994

27. Thermal annealing effect in multi-wall carbon nanotubes

Author: K. Miyamoto, Satoshi Ishii, Y. Matsunaga, Nobuyuki Aoki, R. Enomoto, and Yuichi Ochiai
Subjects: Materials science, Annealing (metallurgy), Nanotechnology, Carbon nanotube, Condensed Matter Physics, Molecular physics, Line width, Electronic, Optical and Magnetic Materials, law.invention, Condensed Matter::Materials Science, law, Condensed Matter::Strongly Correlated Electrons, Electrical and Electronic Engineering, Electron paramagnetic resonance
Abstract: Thermal annealing effect in multi-wall carbon nanotubes has been studied by electron spin resonance (ESR) in order to discuss transport properties. Before annealing two overlapping narrow signals have been observed in ESR but the higher field signal disappears after thermal annealing. The g-value and the line width for the two signals are determined from computer simulation.
Published: 2002

28. Low temperature conductance in multi-wall carbon nano-tubes

Author: R. Enomoto, N. Aoki, K. Horiuchi, Y. Matsunaga, K. Miyamoto, and Yuichi Ochiai
Subjects: Materials science, Condensed matter physics, Contact resistance, chemistry.chemical_element, Conductance, Carbon nanotube, Condensed Matter Physics, Electronic, Optical and Magnetic Materials, law.invention, chemistry, Electrical resistivity and conductivity, law, Luttinger liquid, Nano, Electrode, Electrical and Electronic Engineering, Carbon
Abstract: Low temperature transport in multi-wall carbon nano-tubes (MWNT) has been studied by means of three-terminal measurement in order to discuss on the contact resistance between the electrode and the nano-tube. The net resistance of MWNT and the contact resistance between MWNT and electrode have been determined. No evidence for the exponential behavior is found down to 1 K for both resistances, but the power-law temperature dependence is found. We discuss those power-law behaviors so as to try to fit those into Tomonaga–Luttinger model.
Published: 2002

29. CANGAROO-III Search for Gamma Rays from Kepler's Supernova Remnant

Author: R. Enomoto, Y. Higashi, T. Yoshida, T. Tanimori, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, S. Hayashi, Y. Hirai, K. Inoue, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, J. Kushida, Y. Matsubara, T. Mizukami, Y. Mizumoto, R. Mizuniwa, M. Mori, H. Muraishi, Y. Muraki, T. Naito, T. Nakamori, S. Nakano, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, E. Yamazaki, S. Yanagita, T. Yoshikoshi, and Y. Yukawa
Subjects: Physics, Infrared, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Kepler, law.invention, Telescope, Supernova, Space and Planetary Science, law, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics, Supernova remnant, Cherenkov radiation, Astrophysics::Galaxy Astrophysics
Abstract: Kepler's supernova, discovered in October 1604, produced a remnant that has been well studied observationally in the radio, infrared, optical, and X-ray bands, and theoretically. Some models have predicted a TeV gamma-ray flux that is detectable with current Imaging Cherenkov Atmospheric Telescopes. We report on observations carried out in 2005 April with the CANGAROO-III telescope. No statistically significant excess was observed, and limitations on the allowed parameter range in the model are discussed., 6 pages 6 figures, to appear in ApJ, August 20, 2008, v683n2
Published: 2008

30. A search for charged Higgs bosons at tristan

Author: I. Adachi, H. Aihara, M. Doser, R. Enomoto, H. Fujii, T. Fujii, J. Fujimoto, K. Fujiwara, N. Fujiwara, H. Hayashii, S. Higashi, B. Howell, N. Iida, A. Imanishi, H. Ikeda, T. Ishii, R. Itoh, H. Iwasaki, K. Iwashiro, R. Kajikawa, T. Kamae, S. Kato, Y. Kato, S. Kawabata, Y. Kayahara, H. Kichimi, T. Kishida, M. Kobayashi, D. Koltick, N. Kusuki, I. Levine, A. Maruyama, K. Maruyama, K. Matsushita, A. Miyamoto, K. Muramatsu, K. Nagai, T. Nagira, O. Nitoh, S. Noguchi, F. Ochiai, H. Okuno, T. Okusawa, S. Onodera, H. Ozaki, N. Sasayama, A. Shimonaka, K. Shimozawa, A. Shirahashi, R. Sugahara, A. Sugiyama, S. Suzuki, K. Takahashi, T. Takahashi, H. Takamure, T. Tauchi, Y. Teramoto, T. Tsukamoto, K. Ukai, S. Uno, Y. Watanabe, A. Yamamoto, S. Yamamoto, S. Yamashita, M. Yamauchi, Y. Yoake, and J. Yoshizawa
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Annihilation, High Energy Physics::Phenomenology, Hadron, Supersymmetry, Nuclear physics, Pair production, Higgs boson, High Energy Physics::Experiment, Symmetry breaking, Boson
Abstract: We searched for pair production of charged Higgs bosons via e+e− annihilation, using data (23.3 pb−) collected by the TOPAZ detector in the energy range s = 52.0 – 61.4 GeV. We observed no evidence for charged Higgs pair production and extended the excluded region in the MH±BR (hadron) plane. The 95% CL lower mass limit is the most stringent for BR (hadron) = 0.6, giving mH±
Published: 1990

31. CANGAROO-III Observations of the 2006 Outburst of PKS2155-304

Author: Y. Sakamoto, K. Nishijima, T. Mizukami, E. Yamazaki, J. Kushida, R. Enomoto, M. Ohishi, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hattori, S. Hayashi, Y. Higashi, Y. Hirai, K. Inoue, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, T. Kifune, R. Kiuchi, H. Kubo, R. Mizuniwa, M. Mori, H. Muraishi, T. Naito, T. Nakamori, S. Nakano, D. Nishida, A. Seki, V. Stamatescu, T. Suzuki, D. L. Swaby, T. Tanimori, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, S. Yanagita, T. Yoshida, T. Yoshikoshi, and Y. Yukawa
Subjects: Physics, High energy, Crab Nebula, Space and Planetary Science, Astrophysics (astro-ph), Flux, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Cherenkov radiation
Abstract: We have used the CANGAROO-III imaging atmospheric Cherenkov telescopes to observe the high-frequency-peaked BL Lacertae (HBL) object PKS 2155-304 between 2006 July 28 (MJD 53944) and August 2, triggered by the H.E.S.S. report that the source was in a high state of TeV gamma-ray emission. A signal was detected at the 4.8 sigma level in an effective live time of 25.1 hours during the outburst period. The flux of Very High Energy gammarays from the CANGAROO-III observations shows the variability on the time scale of less than a few hours. The averaged integral flux above 660 GeV is (1.6 +/- 0.3_stat +/- 0.5_syst) x 10^-11 cm^-2 sec^-1 which corresponds to ~45% of the flux observed from the Crab nebula. Follow-up observations between August 17 (MJD 53964) and 25 indicate the source activity had decreased., 24 pages, 7 figures, to be published in ApJ
Published: 2007

32. CANGAROO-III Search for Gamma Rays from Centaurus A and the $\omega$ Centauri Region

Author: S. Kabuki, R. Enomoto, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hattori, S. Hayashi, Y. Higashi, R. Inoue, C. Itoh, F. Kajino, H. Katagiri, A. Kawachi, S. Kawasaki, T. Kifune, R. Kiuchi, K. Konno, H. Kubo, J. Kushida, Y. Matsubara, T. Mizukami, R. Mizuniwa, M. Mori, H. Muraishi, T. Naito, T. Nakamori, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, V. Stamatescu, S. Suzuki, T. Suzuki, D. L. Swaby, T. Tanimori, G. Thornton, F. Tokanai, K. Tsuchiya, S. Watanabe, Y. Yamada, M. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi, M. Yuasa, and Y. Yukawa
Subjects: Physics, Cold dark matter, Radio galaxy, Astrophysics::High Energy Astrophysical Phenomena, Centaurus A, Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, Astronomy and Astrophysics, IACT, Cosmic ray, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Space and Planetary Science, Globular cluster, Omega Centauri, Astrophysics::Galaxy Astrophysics
Abstract: We have observed the giant radio galaxy Centaurus A and the globular cluster $\omega$ Centauri in the TeV energy region using the CANGAROO-III stereoscopic system. The system has been in operation since 2004 withan array of four Imaging Atmospheric Cherenkov Telescopes (IACT) with $\sim$100-m spacings. The observations were carried out in March and April 2004. In total, approximately 10 hours data were obtained for each target.No statistically significant gamma-ray signal has been found above 420 GeV over a wide angular region (a one-degree radius from thepointing center) and we derive flux upper limits using all of the field of view.Implications for the total energy of cosmic rays and the density of the cold dark matter are considered., Comment: 7 pages, 6 figures, to appear in ApJ, emulateapj.cls
Published: 2007

33. CANGAROO-III Observations of the supernova remnant RX J0852.0$-$4622

Author: R. Enomoto, S. Watanabe, T. Tanimori, A. Asahara, G. V. Bicknell, R. W. Clay, P. G. Edwards, S. Gunji, S. Hara, T. Hattori, S. Hayashi, Y. Higashi, R. Inoue, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, A. Kawachi, S. Kawasaki, T. Kifune, R. Kiuchi, K. Konno, L. Ksenofontov, H. Kubo, J. Kushida, Y. Matsubara, T. Mizukami, R. Mizuniwa, M. Mori, H. Muraishi, T. Naito, T. Nakamori, D. Nishida, K. Nishijima, M. Ohishi, Y. Sakamoto, V. Stamatescu, S. Suzuki, T. Suzuki, D. L. Swaby, H. Tanimura, G. Thornton, F. Tokanai, K. Tsuchiya, Y. Yamada, M. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi, M. Yuasa, and Y. Yukawa
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, Coincidence, law.invention, Telescope, Space and Planetary Science, law, Energy spectrum, Supernova remnant, Astrophysics::Galaxy Astrophysics
Abstract: Sub-TeV gamma-ray emission from the North-West rim of the supernova remnant RX J0852.0$-$4622 was detected with the CANGAROO-II telescope and recently confirmed by the H.E.S.S. group. In addition, the H.E.S.S. data revealed a very wide (up to two degrees in diameter), shell-like profile of the gamma-ray emission. We have carried out CANGAROO-III observations in January and February 2005 with three telescopes and show here the results of three-fold coincidence data. We confirm the H.E.S.S. results about the morphology and the energy spectrum, and find the energy spectrum in the NW-rim is consistent with that of the whole remnant., 9 pages, 13 figures, to appear in ApJ
Published: 2006

34. Sensor Nodes Localization Based on Inequalities of Electric Field Intensity

Author: Shinji Ohyama, R. Enomoto, Jun-ya Takayama, and Shintaro Yamada
Subjects: Physics, Radio propagation, Radio propagation model, Blocking (radio), Electric field, Reflection (physics), Electronic engineering, Sensitivity (control systems), Topology, Wireless sensor network, Radio wave
Abstract: Using simultaneous inequalities of electric field intensity observed between sensor nodes during radio communication, the nodes positions are estimated. The multidimensional scaling (MDS) method which is often used in sensitivity measurement is improved to solve sensor nodes localization problem. In the improved MDS, sensor nodes and base nodes those positions are known are dealt separately, and the initial arrangement is set by a method which is suitable for this method. We use two simple radio propagation model which describe the characteristics of electric field intensity approximately. Using these models, computer simulations are executed, and these results reveal that it is possible to estimate sensor nodes positions with high accuracy when reflection and blocking of radio waves are not occurred
Published: 2006

35. A Search for sub-TeV Gamma-rays from the Vela Pulsar Region with CANGAROO-III

Author: R. Enomoto, K. Tsuchiya, Y. Adachi, S. Kabuki, P. G. Edwards, A. Asahara, G. V. Bicknell, R. W. Clay, Y. Doi, S. Gunji, S. Hara, T. Hara, T. Hattori, Sei. Hayashi, Y. Higashi, R. Inoue, C. Itoh, F. Kajino, H. Katagiri, A. Kawachi, S. Kawasaki, T. Kifune, R. Kiuchi, K. Konno, L. T. Ksenofontov, H. Kubo, J. Kushida, Y. Matsubara, Y. Mizumoto, M. Mori, H. Muraishi, Y. Muraki, T. Naito, T. Nakamori, D. Nishida, K. Nishijima, M. Ohishi, J. R. Patterson, R. J. Protheroe, Y. Sakamoto, M. Sato, S. Suzuki, T. Suzuki, D. L. Swaby, T. Tanimori, H. Tanimura, G. J. Thornton, S. Watanabe, T. Yamaoka, M. Yamazaki, S. Yanagita, T. Yoshida, T. Yoshikoshi, M. Yuasa, and Y. Yukawa
Subjects: Physics, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Gamma ray, Astrophysics::Instrumentation and Methods for Astrophysics, FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics, Vela, Pulsar wind nebula, law.invention, Telescope, Pulsar, Space and Planetary Science, law, Cherenkov radiation
Abstract: We made stereoscopic observations of the Vela Pulsar region with two of the 10 m diameter CANGAROO-III imaging atmospheric Cherenkov telescopes in January and February, 2004, in a search for sub-TeV gamma-rays from the pulsar and surrounding regions. We describe the observations, provide a detailed account of the calibration methods, and introduce the improved and bias-free analysis techniques employed for CANGAROO-III data. No evidence of gamma-ray emission is found from either the pulsar position or the previously reported position offset by 0.13 degree, and the resulting upper limits are a factor of five less than the previously reported flux from observations with the CANGAROO-I 3.8 m telescope. Following the recent report by the H.E.S.S. group of TeV gamma-ray emission from the Pulsar Wind Nebula, which is $\sim$0.5 degree south of the pulsar position, we examined this region and found supporting evidence for emission extended over $\sim$0.6 degree., 13 pages, 26 figures, emulateapj.cls, to appear in ApJ
Published: 2005

36. A Search for TeV Gamma-ray Emission from the PSR B1259-63/SS2883 Binary System with the CANGAROO-II 10-m Telescope

Author: A. Kawachi, T. Naito, J. R. Patterson, P. G. Edwards, A. Asahara, G. V. Bicknell, R. W. Clay, R. Enomoto, S. Gunji, S. Hara, T. Hara, T. Hattori, Seuchi Hayashi, Shin'ichiro Hayashi, C. Itoh, S. Kabuki, F. Kajino, H. Katagiri, T. Kifune, L. Ksenofontov, H. Kubo, J. Kushida, Y. Matsubara, Y. Mizumoto, M. Mori, H. Moro, H. Muraishi, Y. Muraki, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, K. Okumura, R. J. Protheroe, K. Sakurazawa, D. L. Swaby, T. Tanimori, F. Tokanai, K. Tsuchiya, H. Tsunoo, T. Uchida, A. Watanabe, S. Watanabe, S. Yanagita, T. Yoshida, and T. Yoshikoshi
Subjects: Physics, Be star, Astrophysics::High Energy Astrophysical Phenomena, Astrophysics (astro-ph), Compton scattering, Gamma ray, FOS: Physical sciences, Astronomy and Astrophysics, Orbital eccentricity, Astrophysics, Astrophysics::Cosmology and Extragalactic Astrophysics, law.invention, Telescope, Pulsar, Space and Planetary Science, law, Astrophysics::Solar and Stellar Astrophysics, Binary system, Astrophysics::Earth and Planetary Astrophysics, Cherenkov radiation, Astrophysics::Galaxy Astrophysics
Abstract: 著者人数: 46名, Accepted: 2004-02-16, 資料番号: SA1003381000
Published: 2004

37. Advanced full additive process for high density printed wiring boards

Author: R. Enomoto, C. Ohashi, M. Asai, and Y. Sakaguchi
Subjects: Composite epoxy material, Materials science, visual_art, Soldering, Oxidizing agent, visual_art.visual_art_medium, Substrate (printing), Epoxy, Adhesive, Composite material, Layer (electronics), Synthetic rubber
Abstract: A description is given of a recently developed heat-resistant adhesive for the full additive process, which has been used successfully for the formation of excellent anchors without the use of synthetic rubber. An epoxy resin with excellent heat resistance and electrical insulating properties is used instead. The adhesive is prepared from an oxidizing-agent-soluble particulate epoxy resin and a heat-resistant epoxy resin solution, that is substantially insoluble in oxidizing agents. The adhesive is applied to an insulating substrate and cured to form an adhesive layer. The particulate epoxy resin on the surface of the cured layer is dissolved by an oxidizing agent to form fine anchors, whereby firm bonding between the unclad laminate and the conductor circuit can be achieved. Full-additive wiring boards made with this heat-resistant adhesive characteristically show high accuracy in high-density wiring, high electrical reliability, high bonding strength at high temperatures, and excellent soldering heat resistance and wire-bonding properties. It is suitable for making printed wiring boards with high density and high reliability. >
Published: 2003

38. Development of 3-dimensional module package, 'System Block Module'

Author: T. Kariya, R. Enomoto, T. Imoto, T. Nishikawa, M. Matsui, C. Takubo, and S. Akejima
Subjects: Engineering, business.industry, Electronic packaging, Hardware_PERFORMANCEANDRELIABILITY, System in package, Printed circuit board, Chip-scale package, Package on package, Hardware_INTEGRATEDCIRCUITS, Quad Flat No-leads package, Integrated circuit packaging, business, Computer hardware, Flip chip
Abstract: As the mobile electronics equipment moves toward higher performance and miniaturizing, each IC package is required to be stacked for saving a package mounting area on a system board. This paper describes a newly developed 3-dimensional module package using the technology of the silicon device thinning, micro flip chip bonding and two types of via connection of print circuit board for vertical wirings. These technology has realized the high density packaging of over 4 ICs stacking for practical use.
Published: 2002

39. Development of an atmospheric Cherenkov imaging camera for the CANGAROO-III experiment

Author: S. Kabuki, K. Tsuchiya, K. Okumura, R. Enomoto, T. Uchida, H. Tsunoo, Shin. Hayashi, Sei. Hayashi, F. Kajino, A. Maeshiro, I. Tada, C. Itoh, A. Asahara, G.V. Bicknell, R.W. Clay, P.G. Edwards, S. Gunji, S. Hara, T. Hara, T. Hattori, H. Katagiri, A. Kawachi, T. Kifune, H. Kubo, J. Kushida, Y. Matsubara, Y. Mizumoto, M. Mori, H. Moro, H. Muraishi, Y. Muraki, T. Naito, T. Nakase, D. Nishida, K. Nishijima, M. Ohishi, J.R. Patterson, R.J. Protheroe, K. Sakurazawa, D.L. Swaby, T. Tanimori, F. Tokanai, A. Watanabe, S. Watanabe, S. Yanagita, T. Yoshida, and T. Yoshikoshi
Subjects: Physics, Nuclear and High Energy Physics, Photomultiplier, Photon, Pixel, business.industry, Astrophysics (astro-ph), Linearity, FOS: Physical sciences, Field of view, Astrophysics, Signal, Optics, Calibration, business, Instrumentation, Cherenkov radiation
Abstract: 著者人数: 47名, Accepted: 2002-12-02, 資料番号: SA1003998000
Published: 2002
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40. Search for directCPviolation inB→Kπdecays

Author: K. Abe, R. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, T. Hokuue, Y. Hoshi, S. R. Hou, W. -S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, H. Konishi, P. Krokovny, R. Kulasiri, S. Kumar, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J. S. Lange, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, E. Nakano, M. Nakao, J. W. Nam, S. Narita, Z. Natkaniec, K. Neichi, S. Nishida, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, S. Stanič, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, Y. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, K. Yoshida, Y. Yusa, H. Yuta, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Nuclear and High Energy Physics, Particle physics
Published: 2001

41. Measurement of inclusive production of neutral pions fromΥ(4S)decays

Author: Yasuo Doi, Shih-Chieh Hsu, K. Hayashi, M. Tanaka, Y. Yamashita, S. Eidelman, A. Satpathy, Shigeki Mori, Hyunwoo Kim, I. Higuchi, S. Uno, A. Bozek, T. Nagamine, S. Noguchi, H. C. Huang, J. Haba, A. Drutskoy, J. H. Kang, A. M. Bakich, Z. Natkaniec, T. Ohshima, D. J. Jackson, D. Beiline, K. Aoki, K. Sumisawa, S. Y. Suzuki, Matthew Jones, Kazunori Hanagaki, K. Neichi, Hiroshi Yamaoka, Masashi Hazumi, Rong-Shyang Lu, O. Nitoh, T. Sumiyoshi, T. E. Browder, Shiro Suzuki, M. Yamauchi, K. Ueno, Y. Chao, A. Sugiyama, Kiyoshi Asai, M. Rozanska, H. B. Li, D. W. Kim, J. Ryuko, S. Yanaka, I. Adachi, A. Kuzmin, Hirokazu Ikeda, H. Kakuno, S. Ogawa, Y. Watanabe, Y. Iwasaki, T. Tomura, C. C. Zhang, H. Shibuya, W. Ostrowicz, M. Yamaga, Hiroyuki Iwasaki, Kevin Varvell, T. Tsukamoto, Y. J. Kwon, W. S. Hou, A. Sugi, Yuji Enari, T. Tsuboyama, K. Korotushenko, Sun Kee Kim, Hiroshi Sakamoto, H. Fujii, R. Enomoto, S. Behari, H. Aihara, Y. Ushiroda, Masaki Fukushima, A. Ishikawa, B. Shwartz, F. Takasaki, Chikara Fukunaga, N.I. Root, S. Ichizawa, J. B. Singh, Y. Tanaka, S. K. Choi, Gianluca Alimonti, S. Nishida, T. Iijima, T. J. Wang, H. Palka, L. E. Piilonen, K. Suzuki, T. Nozaki, N. C. Hastings, Y. Mikami, L. S. Peak, R. Kulasiri, J. L. Rodriguez, S. Matsui, T. Kuniya, E. M. Heenan, H. Miyake, W. Bartel, Byung Gu Cheon, P. Chang, V.A. Sidorov, L.C. Moffitt, Y. C. Huang, Yoshio Yamaoka, C. H. Wang, S. Narita, Heejong Kim, Takahiko Matsubara, Y. Zheng, M. H. Lee, R. Guo, A. Murakami, A. Manabe, Byoung Sup Ahn, Y. Sakai, H. K. Jang, M. Nakao, E. Nakano, Kazuo Abe, Y. Asano, P. Kapusta, S. Okuno, J. S. Kang, S. Uehara, K. Kichimi, K. Hara, N. Katayama, Tomiyoshi Haruyama, T. Okazaki, Ascelin Gordon, B. C. K. Casey, Takuya Higuchi, R. Kagan, A. Yamaguchi, H. Hirano, T. Nakadaira, K. Rybicki, K. Tamai, E.J. Prebys, T. Takahashi, Y. Teramoto, Bruce Yabsley, C. W. Park, E. Won, Elzbieta Banas, T. Okabe, A. Garmash, Hirokazu Ishino, V. M. Aulchenko, H. Yamamoto, E. Kurihara, S. N. Tovey, M. E. Sevior, D. Žontar, H. Kawai, H. Yuta, Y. Yusa, H. J. Kim, S. Matsumoto, S. E. Vahsen, V.N. Zhilich, M. Takita, M. Satapathy, Hyangkyu Park, F. Handa, Yasushi Nagasaka, J. Zhang, S. Semenov, Makoto Tomoto, Y. Choi, T. Hara, Yuichi Tsujita, H. Guler, N. Kawamura, K. Miyabayashi, J. Tanaka, H. Ozaki, Kyo Yoshida, M. D. Peters, S. H. Lee, N. Tamura, G. F. Moorhead, K. Trabelsi, T. Aushev, Y. Igarashi, T. Matsumoto, P. Krokovny, K. Misono, Shaji Kumar, H. Hayashii, T. Aso, S. L. Olsen, H. Miyata, Prafulla Kumar Behera, Y. Hoshi, M. Z. Wang, K. Kinoshita, Y. Nagashima, G. N. Taylor, J. S. Lange, H. Hamasaki, J. W. Nam, J. Dragic, C. C. Wang, S. Schrenk, Hiroyuki Sagawa, Yasuhiko Yamada, M. Akatsu, G. R. Moloney, Y. Unno, D. Liventsev, Go Iwai, K. Inami, T. Hojo, Changwon Park, Y. Higasino, P. Jalocha, Yasuhiro Ohshima, G. S. Varner, R. Itoh, F. Fang, Yu. V. Usov, K. Ikeda, J. Kaneko, K. Gotow, S. K. Swain, K. Senyo, T. Kawasaki, S. Stanič, and A. Bondar
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, KEKB, Pion, Electron–positron annihilation, Multiplicity (chemistry), Storage ring
Abstract: Using the Belle detector operating at the KEKB ${e}^{+}{e}^{\ensuremath{-}}$ storage ring, we have measured the mean multiplicity and momentum spectrum of neutral pions from the decays of the $\ensuremath{\Upsilon}(4S)$ resonance. We measure a mean of $4.70\ifmmode\pm\else\textpm\fi{}0.04\ifmmode\pm\else\textpm\fi{}0.22$ neutral pions per $\ensuremath{\Upsilon}(4S)$ decay.
Published: 2001

42. Observation of Cabibbo SuppressedB→D(*)K−Decays at Belle

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, W. Bartel, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, B. G. Cheon, S.-K. Choi, Y. Choi, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, M. H. Lee, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsumoto, T. Matsumoto, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, S. Narita, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanic̆, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Z̆ontar
Subjects: Nuclear physics, Physics, Crystallography, KEKB, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, Electron–positron annihilation, General Physics and Astronomy
Abstract: We report observations of the Cabibbo suppressed decays B{yields}D{sup (*)}K{sup -} using a 10.4 fb{sup -1} data sample accumulated at the {Upsilon}(4S) resonance with the Belle detector at the KEKB e{sup +}e{sup -} storage ring. We find that the ratios of Cabibbo suppressed to Cabibbo favored branching fractions are B(B{sup -}{yields}D{sup 0}K{sup -})/B(B{sup -} {yields}D{sup 0}{pi}{sup -})= 0.079{+-} 0.009{+-} 0.006 , B({bar B}{sup 0} {yields}D{sup +}K{sup -})/B({bar B}{sup 0 }{yields} D{sup +}{pi}{sup -}) =0.068 {+-}0.015 {+-}0.007 , B(B{sup -}{yields} D{sup *0}K{sup -}) /B(B{sup -} {yields}D{sup *0}{pi}{sup -})= 0.078{+-} 0.019{+-} 0.009 , and B({bar B}{sup 0}{yields} D{sup *+}K{sup -})/ B({bar B}{sup 0}{yields} D{sup *+}{pi}{sup -})=0.074{+-}0.015{+-} 0.006 . These are the first observations of the B{yields}D{sup +}K{sup -} , D{sup *0}K{sup -} , and D{sup *+}K{sup -} decay processes.
Published: 2001

43. Measurement of Branching Fractions forB→ππ,Kπ, andKKDecays

Author: K. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, W. Bartel, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K. F. Chen, B. G. Cheon, S.-K. Choi, Y. Choi, S. Eidelman, Y. Enari, R. Enomoto, F. Fang, H. Fujii, M. Fukushima, A. Garmash, A. Gordon, K. Gotow, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, I. Higuchi, T. Higuchi, H. Hirano, T. Hojo, Y. Hoshi, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, N. Katayama, H. Kawai, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, K. Kinoshita, S. Kobayashi, P. Krokovny, R. Kulasiri, S. Kumar, A. Kuzmin, Y.-J. Kwon, J. S. Lange, M. H. Lee, S. H. Lee, D. Liventsev, R.-S. Lu, D. Marlow, T. Matsubara, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Miyabayashi, H. Miyake, H. Miyata, G. R. Moloney, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, T. Nakadaira, E. Nakano, M. Nakao, J. W. Nam, S. Narita, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, M. E. Sevior, H. Shibuya, B. Shwartz, V. Sidorov, J. B. Singh, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, Y. Usov, S. E. Vahsen, G. Varner, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, Y. Yamashita, M. Yamauchi, S. Yanaka, M. Yokoyama, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Nuclear physics, Physics, Particle physics, Pion, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, Resonance, B meson, Particle identification
Abstract: We report measurements of the branching fractions for $B^0\to\pi^+\pi^-$, $K^+\pi^-$, $K^+K^-$ and $K^0\pi^0$, and $B^+\to\pi^+\pi^0$, $K^+\pi^0$, $K^0\pi^+$ and $K^+\overline{K}{}^0$. The results are based on 10.4 fb$^{-1}$ of data collected on the $\Upsilon$(4S) resonance at the KEKB $e^+e^-$ storage ring with the Belle detector, equipped with a high momentum particle identification system for clear separation of charged $\pi$ and $K$ mesons. We find ${\cal B}(B^0\to\pi^+\pi^-) =(0.56^{+0.23}_{-0.20}\pm 0.04)\times 10^{-5}$, ${\cal B}(B^0\to K^+\pi^-) =(1.93^{+0.34 +0.15}_{-0.32 -0.06})\times 10^{-5}$, ${\cal B}(B^+\to K^+\pi^0) =(1.63^{+0.35 +0.16}_{-0.33 -0.18})\times 10^{-5}$, ${\cal B}(B^+\to K^0\pi^+) =(1.37^{+0.57 +0.19}_{-0.48 -0.18})\times 10^{-5}$, and ${\cal B}(B^0\to K^0\pi^0) =(1.60^{+0.72 +0.25}_{-0.59 -0.27})\times 10^{-5}$, where the first and second errors are statistical and systematic. We also set upper limits of ${\cal B}(B^+\to\pi^+\pi^0)
Published: 2001

44. Observation of LargeCPViolation in the NeutralBMeson System

Author: K. Abe, R. Abe, I. Adachi, Byoung Sup Ahn, H. Aihara, M. Akatsu, G. Alimonti, K. Asai, M. Asai, Y. Asano, T. Aso, V. Aulchenko, T. Aushev, A. M. Bakich, E. Banas, S. Behari, P. K. Behera, D. Beiline, A. Bondar, A. Bozek, T. E. Browder, B. C. K. Casey, P. Chang, Y. Chao, K.-F. Chen, B. G. Cheon, R. Chistov, S.-K. Choi, Y. Choi, L. Y. Dong, J. Dragic, A. Drutskoy, S. Eidelman, V. Eiges, Y. Enari, R. Enomoto, C. W. Everton, F. Fang, H. Fujii, C. Fukunaga, M. Fukushima, N. Gabyshev, A. Garmash, T. J. Gershon, A. Gordon, K. Gotow, H. Guler, R. Guo, J. Haba, H. Hamasaki, K. Hanagaki, F. Handa, K. Hara, T. Hara, N. C. Hastings, H. Hayashii, M. Hazumi, E. M. Heenan, Y. Higasino, I. Higuchi, T. Higuchi, T. Hirai, H. Hirano, T. Hojo, T. Hokuue, Y. Hoshi, K. Hoshina, S. R. Hou, W.-S. Hou, S.-C. Hsu, H.-C. Huang, Y. Igarashi, T. Iijima, H. Ikeda, K. Ikeda, K. Inami, A. Ishikawa, H. Ishino, R. Itoh, G. Iwai, H. Iwasaki, Y. Iwasaki, D. J. Jackson, P. Jalocha, H. K. Jang, M. Jones, R. Kagan, H. Kakuno, J. Kaneko, J. H. Kang, J. S. Kang, P. Kapusta, N. Katayama, H. Kawai, Y. Kawakami, N. Kawamura, T. Kawasaki, H. Kichimi, D. W. Kim, Heejong Kim, H. J. Kim, Hyunwoo Kim, S. K. Kim, T. H. Kim, K. Kinoshita, S. Kobayashi, S. Koishi, H. Konishi, K. Korotushenko, P. Krokovny, R. Kulasiri, S. Kumar, T. Kuniya, E. Kurihara, A. Kuzmin, Y.-J. Kwon, J. S. Lange, G. Leder, M. H. Lee, S. H. Lee, C. Leonidopoulos, Y.-S. Lin, D. Liventsev, R.-S. Lu, J. MacNaughton, D. Marlow, T. Matsubara, S. Matsui, S. Matsumoto, T. Matsumoto, Y. Mikami, K. Misono, K. Miyabayashi, H. Miyake, H. Miyata, L. C. Moffitt, G. R. Moloney, G. F. Moorhead, S. Mori, T. Mori, A. Murakami, T. Nagamine, Y. Nagasaka, Y. Nagashima, T. Nakadaira, T. Nakamura, E. Nakano, M. Nakao, H. Nakazawa, J. W. Nam, Z. Natkaniec, K. Neichi, S. Nishida, O. Nitoh, S. Noguchi, T. Nozaki, S. Ogawa, T. Ohshima, Y. Ohshima, T. Okabe, T. Okazaki, S. Okuno, S. L. Olsen, H. Ozaki, P. Pakhlov, H. Palka, C. S. Park, C. W. Park, H. Park, L. S. Peak, M. Peters, L. E. Piilonen, E. Prebys, J. L. Rodriguez, N. Root, M. Rozanska, K. Rybicki, J. Ryuko, H. Sagawa, Y. Sakai, H. Sakamoto, M. Satapathy, A. Satpathy, S. Schrenk, S. Semenov, K. Senyo, Y. Settai, M. E. Sevior, H. Shibuya, B. Shwartz, A. Sidorov, S. Stanič, A. Sugi, A. Sugiyama, K. Sumisawa, T. Sumiyoshi, J.-I. Suzuki, K. Suzuki, S. Suzuki, S. Y. Suzuki, S. K. Swain, H. Tajima, T. Takahashi, F. Takasaki, M. Takita, K. Tamai, N. Tamura, J. Tanaka, M. Tanaka, G. N. Taylor, Y. Teramoto, M. Tomoto, T. Tomura, S. N. Tovey, K. Trabelsi, T. Tsuboyama, T. Tsukamoto, S. Uehara, K. Ueno, Y. Unno, S. Uno, Y. Ushiroda, S. E. Vahsen, K. E. Varvell, C. C. Wang, C. H. Wang, J. G. Wang, M.-Z. Wang, Y. Watanabe, E. Won, B. D. Yabsley, Y. Yamada, M. Yamaga, A. Yamaguchi, H. Yamamoto, T. Yamanaka, Y. Yamashita, M. Yamauchi, S. Yanaka, J. Yashima, M. Yokoyama, K. Yoshida, Y. Yusa, H. Yuta, C. C. Zhang, J. Zhang, H. W. Zhao, Y. Zheng, V. Zhilich, and D. Žontar
Subjects: Physics, Particle physics, KEKB, Meson, Electron–positron annihilation, General Physics and Astronomy, CP violation, Resonance, High Energy Physics::Experiment, B meson, Standard Model
Abstract: We present a measurement of the standard model $\mathrm{CP}$ violation parameter $\mathrm{sin}2{\ensuremath{\varphi}}_{1}$ based on a $29.1{\mathrm{fb}}^{\ensuremath{-}1}$ data sample collected at the $\ensuremath{\Upsilon}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy ${e}^{+}{e}^{\ensuremath{-}}$ collider. One neutral $B$ meson is fully reconstructed as a $J/\ensuremath{\psi}{K}_{S}$, $\ensuremath{\psi}(2S){K}_{S}$, ${\ensuremath{\chi}}_{c1}{K}_{S}$, ${\ensuremath{\eta}}_{c}{K}_{S}$, $J/\ensuremath{\psi}{K}_{L}$, or $J/\ensuremath{\psi}{K}^{*0}$ decay and the flavor of the accompanying $B$ meson is identified from its decay products. From the asymmetry in the distribution of the time intervals between the two $B$ meson decay points, we determine $\mathrm{sin}2{\ensuremath{\varphi}}_{1}\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0.99\ifmmode\pm\else\textpm\fi{}0.14(\mathrm{stat})\ifmmode\pm\else\textpm\fi{}0.06(\mathrm{syst})$. We conclude that we have observed $\mathrm{CP}$ violation in the neutral $B$ meson system.
Published: 2001

45. Ibudilast attenuates astrocyte apoptosis via cyclic GMP signalling pathway in an in vitro reperfusion model

Author: K, Takuma, E, Lee, R, Enomoto, K, Mori, A, Baba, and T, Matsuda
Subjects: Indoles, Purinones, Cell Survival, Phosphodiesterase Inhibitors, Pyridines, Carbazoles, Apoptosis, Cytochrome c Group, Alkaloids, Theophylline, Cyclic GMP-Dependent Protein Kinases, Animals, Enzyme Inhibitors, Pentoxifylline, Rats, Wistar, Cyclic GMP, Vinca Alkaloids, Dose-Response Relationship, Drug, DNA, Dipyridamole, Hydrogen Peroxide, Mitochondria, Rats, Animals, Newborn, Astrocytes, Reperfusion Injury, Papers, Peptide Hydrolases, Signal Transduction
Abstract: We examined the effect of 3-isobutyryl-2-isopropylpyrazolo[1,5-a]pyridine (ibudilast), which has been clinically used for bronchial asthma and cerebrovascular disorders, on cell viability induced in a model of reperfusion injury. Ibudilast at 10 - 100 microM significantly attenuated the H(2)O(2)-induced decrease in cell viability. Ibudilast inhibited the H(2)O(2)-induced cytochrome c release, caspase-3 activation, DNA ladder formation and nuclear condensation, suggesting its anti-apoptotic effect. Phosphodiesterase inhibitors such as theophylline, pentoxyfylline, vinpocetine, dipyridamole and zaprinast, which increased the guanosine-3',5'-cyclic monophosphate (cyclic GMP) level, and dibutyryl cyclic GMP attenuated the H(2)O(2)-induced injury in astrocytes. Ibudilast increased the cyclic GMP level in astrocytes. The cyclic GMP-dependent protein kinase inhibitor KT5823 blocked the protective effects of ibudilast and dipyridamole on the H(2)O(2)-induced decrease in cell viability, while the cyclic AMP-dependent protein kinase inhibitor KT5720, the cyclic AMP antagonist Rp-cyclic AMPS, the mitogen-activated protein/extracellular signal-regulated kinase inhibitor PD98059 and the leukotriene D(4) antagonist LY 171883 did not. KT5823 also blocked the effect of ibudilast on the H(2)O(2)-induced cytochrome c release and caspase-3-like protease activation. These findings suggest that ibudilast prevents the H(2)O(2)-induced delayed apoptosis of astrocytes via a cyclic GMP, but not cyclic AMP, signalling pathway.
Published: 2001

46. Measurement of branching fractions for B --pipi, Kpi, and KK decays

Author: K, Abe, I, Adachi, B S, Ahn, H, Aihara, M, Akatsu, G, Alimonti, Y, Asano, T, Aso, V, Aulchenko, T, Aushev, A M, Bakich, W, Bartel, S, Behari, P K, Behera, D, Beiline, A, Bondar, A, Bozek, T E, Browder, B C, Casey, P, Chang, Y, Chao, K F, Chen, B G, Cheon, S K, Choi, Y, Choi, S, Eidelman, Y, Enari, R, Enomoto, F, Fang, H, Fujii, M, Fukushima, A, Garmash, A, Gordon, K, Gotow, R, Guo, J, Haba, H, Hamasaki, K, Hanagaki, F, Handa, K, Hara, T, Hara, N C, Hastings, H, Hayashii, M, Hazumi, E M, Heenan, I, Higuchi, T, Higuchi, H, Hirano, T, Hojo, Y, Hoshi, W S, Hou, S C, Hsu, H C, Huang, Y, Igarashi, T, Iijima, H, Ikeda, K, Inami, A, Ishikawa, H, Ishino, R, Itoh, G, Iwai, H, Iwasaki, Y, Iwasaki, D J, Jackson, P, Jalocha, H K, Jang, M, Jones, H, Kakuno, J, Kaneko, J H, Kang, J S, Kang, N, Katayama, H, Kawai, T, Kawasaki, H, Kichimi, D W, Kim, H, Kim, H J, Kim, S K, Kim, K, Kinoshita, S, Kobayashi, P, Krokovny, R, Kulasiri, S, Kumar, A, Kuzmin, Y J, Kwon, J S, Lange, M H, Lee, S H, Lee, D, Liventsev, R S, Lu, D, Marlow, T, Matsubara, S, Matsumoto, T, Matsumoto, Y, Mikami, K, Miyabayashi, H, Miyake, H, Miyata, G R, Moloney, S, Mori, T, Mori, A, Murakami, T, Nagamine, Y, Nagasaka, T, Nakadaira, E, Nakano, M, Nakao, J W, Nam, S, Narita, S, Nishida, O, Nitoh, S, Noguchi, T, Nozaki, S, Ogawa, T, Ohshima, T, Okabe, S, Okuno, S L, Olsen, H, Ozaki, P, Pakhlov, H, Palka, C S, Park, C W, Park, H, Park, L S, Peak, M, Peters, L E, Piilonen, J L, Rodriguez, N, Root, M, Rozanska, K, Rybicki, J, Ryuko, H, Sagawa, Y, Sakai, H, Sakamoto, M, Satapathy, A, Satpathy, S, Schrenk, S, Semenov, K, Senyo, M E, Sevior, H, Shibuya, B, Shwartz, V, Sidorov, J B, Singh, S, Stanic, A, Sugi, A, Sugiyama, K, Sumisawa, T, Sumiyoshi, J I, Suzuki, K, Suzuki, S, Suzuki, S Y, Suzuki, S K, Swain, H, Tajima, T, Takahashi, F, Takasaki, M, Takita, K, Tamai, N, Tamura, J, Tanaka, M, Tanaka, G N, Taylor, Y, Teramoto, M, Tomoto, T, Tomura, S N, Tovey, K, Trabelsi, T, Tsuboyama, T, Tsukamoto, S, Uehara, K, Ueno, Y, Unno, S, Uno, Y, Ushiroda, Y, Usov, S E, Vahsen, G, Varner, K E, Varvell, C C, Wang, C H, Wang, J G, Wang, M Z, Wang, Y, Watanabe, E, Won, B D, Yabsley, Y, Yamada, M, Yamaga, A, Yamaguchi, H, Yamamoto, Y, Yamashita, M, Yamauchi, S, Yanaka, M, Yokoyama, Y, Yusa, H, Yuta, C C, Zhang, J, Zhang, H W, Zhao, Y, Zheng, V, Zhilich, and D, Zontar
Published: 2001

47. Measurement of the CP violation parameter sin2 phi(1) in B(0)(d) meson decays

Author: A, Abashian, K, Abe, I, Adachi, B S, Ahn, H, Aihara, M, Akatsu, G, Alimonti, K, Aoki, K, Asai, M, Asai, Y, Asano, T, Aso, V, Aulchenko, T, Aushev, A M, Bakich, E, Banas, S, Behari, P K, Behera, D, Beiline, A, Bondar, A, Bozek, T E, Browder, B C, Casey, P, Chang, Y, Chao, B G, Cheon, S K, Choi, Y, Choi, Y, Doi, J, Dragic, A, Drutskoy, S, Eidelman, Y, Enari, R, Enomoto, C W, Everton, F, Fang, H, Fujii, K, Fujimoto, Y, Fujita, C, Fukunaga, M, Fukushima, A, Garmash, A, Gordon, K, Gotow, H, Guler, R, Guo, J, Haba, T, Haji, H, Hamasaki, K, Hanagaki, F, Handa, K, Hara, T, Hara, T, Haruyama, N C, Hastings, K, Hayashi, H, Hayashii, M, Hazumi, E M, Heenan, Y, Higashi, Y, Higashino, I, Higuchi, T, Higuchi, T, Hirai, H, Hirano, M, Hirose, T, Hojo, Y, Hoshi, K, Hoshina, W S, Hou, S C, Hsu, H C, Huang, Y C, Huang, S, Ichizawa, Y, Igarashi, T, Iijima, H, Ikeda, K, Ikeda, K, Inami, Y, Inoue, A, Ishikawa, H, Ishino, R, Itoh, G, Iwai, M, Iwai, M, Iwamoto, H, Iwasaki, Y, Iwasaki, D J, Jackson, P, Jalocha, H K, Jang, M, Jones, R, Kagan, H, Kakuno, J, Kaneko, J H, Kang, J S, Kang, P, Kapusta, K, Kasami, N, Katayama, H, Kawai, M, Kawai, N, Kawamura, T, Kawasaki, H, Kichimi, D W, Kim, H, Kim, H J, Kim, S K, Kim, K, Kinoshita, S, Kobayashi, S, Koike, S, Koishi, Y, Kondo, H, Konishi, K, Korotushenko, P, Krokovny, R, Kulasiri, S, Kumar, T, Kuniya, E, Kurihara, A, Kuzmin, Y J, Kwon, M H, Lee, S H, Lee, C, Leonidopoulos, H B, Li, R S, Lu, Y, Makida, A, Manabe, D, Marlow, T, Matsubara, T, Matsuda, S, Matsui, S, Matsumoto, T, Matsumoto, Y, Mikami, K, Misono, K, Miyabayashi, H, Miyake, H, Miyata, L C, Moffitt, A, Mohapatra, G R, Moloney, G F, Moorhead, N, Morgan, S, Mori, T, Mori, A, Murakami, T, Nagamine, Y, Nagasaka, Y, Nagashima, T, Nakadaira, T, Nakamura, E, Nakano, M, Nakao, H, Nakazawa, J W, Nam, S, Narita, Z, Natkaniec, K, Neichi, S, Nishida, O, Nitoh, S, Noguchi, T, Nozaki, S, Ogawa, T, Ohshima, Y, Ohshima, T, Okabe, T, Okazaki, S, Okuno, S L, Olsen, W, Ostrowicz, H, Ozaki, P, Pakhlov, H, Palka, C S, Park, C W, Park, H, Park, L S, Peak, M, Peters, L E, Piilonen, E, Prebys, J L, Rodriguez, N, Root, M, Rozanska, K, Rybicki, J, Ryuko, H, Sagawa, S, Saitoh, Y, Sakai, H, Sakamoto, H, Sakaue, M, Satapathy, N, Sato, A, Satpathy, S, Schrenk, S, Semenov, Y, Settai, M E, Sevior, H, Shibuya, B, Shwartz, A, Sidorov, V, Sidorov, J B, Singh, S, Stanic, A, Sugi, A, Sugiyama, K, Sumisawa, T, Sumiyoshi, J, Suzuki, K, Suzuki, S, Suzuki, S Y, Suzuki, S K, Swain, H, Tajima, T, Takahashi, F, Takasaki, M, Takita, K, Tamai, N, Tamura, J, Tanaka, M, Tanaka, Y, Tanaka, G N, Taylor, Y, Teramoto, M, Tomoto, T, Tomura, S N, Tovey, K, Trabelsi, T, Tsuboyama, Y, Tsujita, T, Tsukamoto, S, Uehara, K, Ueno, N, Ujiie, Y, Unno, S, Uno, Y, Ushiroda, Y, Usov, S E, Vahsen, G, Varner, K E, Varvell, C C, Wang, C H, Wang, M Z, Wang, T J, Wang, Y, Watanabe, E, Won, B D, Yabsley, Y, Yamada, M, Yamaga, A, Yamaguchi, H, Yamaguchi, H, Yamamoto, T, Yamanaka, H, Yamaoka, Y, Yamaoka, Y, Yamashita, M, Yamauchi, S, Yanaka, M, Yokoyama, K, Yoshida, Y, Yusa, H, Yuta, C C, Zhang, H W, Zhao, J, Zhang, Y, Zheng, V, Zhilich, and D, Zontar
Abstract: We present a measurement of the standard model CP violation parameter sin2 phi(1) (also known as sin2beta) based on a 10.5 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric e(+)e(-) collider. One neutral B meson is reconstructed in the J/psiK(S), psi(2S)K(S), chi(c1)K(S), eta(c)K(S), J/psiK(L), or J/psipi(0) CP-eigenstate decay channel and the flavor of the accompanying B meson is identified from its charged particle decay products. From the asymmetry in the distribution of the time interval between the two B-meson decay points, we determine sin2 phi(1) = 0.58(+0.32)(-0.34)(stat)+0.09-0.10(syst).
Published: 2001

48. Low-temperature magneto-transport in multi-wall carbon nanotubes

Author: N. Aoki, R. Enomoto, K. Ishibashi, and Yuichi Ochiai
Subjects: Materials science, Condensed matter physics, Magnetoresistance, Conductance, Nanotechnology, Carbon nanotube, Condensed Matter::Mesoscopic Systems and Quantum Hall Effect, law.invention, Electric arc, Electrical resistance and conductance, Electrical resistivity and conductivity, law, Condensed Matter::Strongly Correlated Electrons, Magneto, Electrical conductor
Abstract: Low temperature magnetoresistance in multi-wall carbon nanotubes prepared by d.c. arc discharge, has been studied. Those tubes show a highly distributed electrical resistance from metallic to semi-insulating conductors. No evidence for the exponential behavior is found down to 1 K, but temperature dependence of the power law is found to be clear as the conductance is reduced. We discuss these observations to try to fit Tomonaga-Luttinger theory for one-dimensional conductor.
Published: 2001

49. Measurement of B(0)(d)-B_(0)(d) mixing rate from the time evolution of dilepton events at the upsilon(4S)

Author: K, Abe, I, Adachi, B S, Ahn, H, Aihara, M, Akatsu, G, Alimonti, K, Aoki, K, Asai, M, Asai, Y, Asano, T, Aso, V, Aulchenko, T, Aushev, A M, Bakich, E, Banas, S, Behari, P K, Behera, D, Beiline, A, Bondar, A, Bozek, T E, Browder, B C, Casey, P, Chang, Y, Chao, B G, Cheon, S K, Choi, Y, Choi, Y, Doi, J, Dragic, S, Eidelman, Y, Enari, R, Enomoto, C W, Everton, F, Fang, H, Fujii, Y, Fujita, C, Fukunaga, M, Fukushima, A, Garmash, A, Gordon, K, Gotow, H, Guler, R, Guo, J, Haba, T, Haji, H, Hamasaki, K, Hanagaki, F, Handa, K, Hara, T, Hara, N C, Hastings, K, Hayashi, H, Hayashii, M, Hazumi, E M, Heenan, I, Higuchi, T, Higuchi, T, Hirai, H, Hirano, T, Hojo, Y, Hoshi, W S, Hou, S C, Hsu, H C, Huang, Y C, Huang, S, Ichizawa, Y, Igarashi, T, Iijima, H, Ikeda, K, Ikeda, K, Inami, Y, Inoue, A, Ishikawa, H, Ishino, R, Itoh, G, Iwai, H, Iwasaki, Y, Iwasaki, D J, Jackson, P, Jalocha, H K, Jang, M, Jones, R, Kagan, H, Kakuno, J, Kaneko, J H, Kang, J S, Kang, P, Kapusta, K, Kasami, N, Katayama, H, Kawai, M, Kawai, N, Kawamura, T, Kawasaki, H, Kichimi, D W, Kim, H, Kim, H J, Kim, S K, Kim, K, Kinoshita, S, Kobayashi, S, Koike, S, Koishi, H, Konishi, K, Korotushenko, P, Krokovny, R, Kulasiri, S, Kumar, T, Kuniya, E, Kurihara, A, Kuzmin, Y J, Kwon, M H, Lee, S H, Lee, C, Leonidopoulos, H B, Li, R S, Lu, Y, Makida, A, Manabe, D, Marlow, T, Matsubara, T, Matsuda, S, Matsui, S, Matsumoto, T, Matsumoto, K, Miyabayashi, H, Miyake, H, Miyata, L C, Moffitt, A, Mohapatra, G R, Moloney, G F, Moorhead, S, Mori, T, Mori, A, Murakami, T, Nagamine, Y, Nagasaka, Y, Nagashima, T, Nakadaira, E, Nakano, M, Nakao, H, Nakazawa, J W, Nam, S, Narita, Z, Natkaniec, K, Neichi, S, Nishida, O, Nitoh, S, Noguchi, T, Nozaki, S, Ogawa, T, Ohshima, Y, Ohshima, T, Okabe, T, Okazaki, S, Okuno, S L, Olsen, H, Ozaki, P, Pakhlov, H, Palka, C S, Park, C W, Park, H, Park, L S, Peak, M, Peters, L E, Piilonen, E, Prebys, J, Raaf, J L, Rodriguez, N, Root, M, Rozanska, K, Rybicki, J, Ryuko, H, Sagawa, Y, Sakai, H, Sakamoto, H, Sakaue, M, Satapathy, N, Sato, A, Satpathy, S, Schrenk, S, Semenov, M E, Sevior, H, Shibuya, B, Shwartz, A, Sidorov, V, Sidorov, S, Stanic, A, Sugi, A, Sugiyama, K, Sumisawa, T, Sumiyoshi, J, Suzuki, K, Suzuki, S, Suzuki, S Y, Suzuki, S K, Swain, H, Tajima, T, Takahashi, F, Takasaki, M, Takita, K, Tamai, N, Tamura, J, Tanaka, M, Tanaka, Y, Tanaka, G N, Taylor, Y, Teramoto, M, Tomoto, T, Tomura, S N, Tovey, K, Trabelsi, T, Tsuboyama, Y, Tsujita, T, Tsukamoto, S, Uehara, K, Ueno, N, Ujiie, Y, Unno, S, Uno, Y, Ushiroda, Y, Usov, S E, Vahsen, G, Varner, K E, Varvell, C C, Wang, C H, Wang, M Z, Wang, T J, Wang, Y, Watanabe, E, Won, B D, Yabsley, Y, Yamada, M, Yamaga, A, Yamaguchi, H, Yamaguchi, H, Yamaoka, Y, Yamaoka, Y, Yamashita, M, Yamauchi, S, Yanaka, M, Yokoyama, K, Yoshida, Y, Yusa, H, Yuta, C C, Zhang, H W, Zhao, Y, Zheng, V, Zhilich, and D, Zontar
Abstract: We report a determination of the B(0)(d)-B_(0)(d) mixing parameter Deltam(d) based on the time evolution of dilepton yields in Upsilon(4S) decays. The measurement is based on a 5.9 fb(-1) data sample collected by the Belle detector at KEKB. The proper-time difference distributions for same-sign and opposite-sign dilepton events are simultaneously fitted to an expression containing Deltam(d) as a free parameter. Using both muons and electrons, we obtain Deltam(d) = 0.463+/-0.008 (stat)+/-0.016 (syst) ps(-1). This is the first determination of Deltam(d) from time evolution measurements at the Upsilon(4S). We also place limits on possible CPT violations.
Published: 2000

50. Measurement of Radiation Damage on Silica Aerogel \v Cerenkov Radiator

Author: S.K. Sahu, M.Z. Wang, R. Suda, R. Enomoto, K.C. Peng, C.H. Wang, I. Adachi, M. Amami, Y.H. Chang, R.S. Guo, K. Hayashi, T. Iijima, T. Sumiyoshi, and Y. Yoshida
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, business.industry, Equivalent dose, FOS: Physical sciences, Aerogel, Radiation, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Optics, Radiator (engine cooling), Radiation damage, Transmittance, Irradiation, business, Instrumentation, Refractive index
Abstract: We measured the radiation damage on silica aerogel \v Cerenkov radiators originally developed for the $B$-factory experiment at KEK. Refractive index of the aerogel samples ranged from 1.012 to 1.028. The samples were irradiated up to 9.8~MRad of equivalent dose. Measurements of transmittance and refractive index were carried out and these samples were found to be radiation hard. Deteriorations in transparency and changes of refractive index were observed to be less than 1.3\% and 0.001 at 90\% confidence level, respectively. Prospects of using aerogels under high-radiation environment are discussed., Comment: Latex, article, epsf, 21 pages, 5 figures (eps)
Published: 1996
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