M
Masaharu Ieiri
Researcher at KEK
Publications - 146
Citations - 3381
Masaharu Ieiri is an academic researcher from KEK. The author has contributed to research in topics: Beam (structure) & J-PARC. The author has an hindex of 25, co-authored 139 publications receiving 3129 citations.
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Journal ArticleDOI
Measurement of neutrino oscillation by the K2K experiment
M. H. Ahn,E. Aliu,S. Andringa,Shigeki Aoki,Y. Aoyama,J. Argyriades,K. Asakura,R. Ashie,F. Berghaus,H. G. Berns,H. C. Bhang,A. Blondel,Silvia Borghi,J. Bouchez,S. C. Boyd,Jordi Burguet-Castell,David William Casper,J. Catala,C. Cavata,A. Cervera,Shaomin Chen,K. O. Cho,J. H. Choi,U. Dore,S. Echigo,X. Espinal,M. Fechner,E. Fernandez,K. Fujii,Y. Fujii,S. Fukuda,Y. Fukuda,J.J. Gómez-Cadenas,R. Gran,T. Hara,Masaya Hasegawa,Takehisa Hasegawa,K. Hayashi,Y. Hayato,R. L. Helmer,I. Higuchi,J. Hill,Katsuki Hiraide,E. Hirose,J. Hosaka,A. K. Ichikawa,Masaharu Ieiri,Masataka Iinuma,A. Ikeda,T. Inagaki,T. Ishida,K. Ishihara,H. Ishii,T. Ishii,Hirokazu Ishino,Masaki Ishitsuka,Yoshitaka Itow,T. Iwashita,H. I. Jang,J. S. Jang,E. J. Jeon,I. S. Jeong,K. K. Joo,G. Jover,C. K. Jung,Takaaki Kajita,J. Kameda,K. Kaneyuki,B. H. Kang,I. Kato,Y. Kato,E. Kearns,D. Kerr,C. O. Kim,M. M. Khabibullin,A. N. Khotjantsev,D. Kielczewska,Beom Jun Kim,Hyosun Kim,J.H. Kim,J. Y. Kim,S. B. Kim,M. Kitamura,P. Kitching,Katsuhiro Kobayashi,Takashi Kobayashi,M. Kohama,A. Konaka,Yusuke Koshio,W. R. Kropp,J. Kubota,Yu. Kudenko,G. Kume,Yoshitaka Kuno,Y. Kurimoto,T. Kutter,T. Kutter,John G. Learned,S. Likhoded,I. T. Lim,S. H. Lim,P. F. Loverre,L. Ludovici,H. Maesaka,J. Mallet,C. Mariani,K. Martens,Tomoyuki Maruyama,S. Matsuno,V. A. Matveev,C. Mauger,K. B. McConnel Mahn,C. McGrew,S P Mikheyev,M. Minakawa,A. Minamino,S. Mine,O. V. Mineev,C. Mitsuda,G. Mitsuka,M. Miura,Y. Moriguchi,Taichi Morita,Shigetaka Moriyama,T. Nakadaira,Masayuki Nakahata,K. Nakamura,Itsuo Nakano,F. Nakata,Tsuyoshi Nakaya,Shoei Nakayama,Toshio Namba,R. Nambu,S. Nawang,K. Nishikawa,H. Nishino,Shogo Nishiyama,K. Nitta,Susumu Noda,Hiroyuki Noumi,F. Nova,P. Novella,Y. Obayashi,A. Okada,Ko Okumura,M. Okumura,M. Onchi,T. Ooyabu,S. M. Oser,T. Otaki,Yuichi Oyama,M. Y. Pac,H. Park,F. Pierre,A. Rodriguez,C. Saji,A. Sakai,Makoto Sakuda,Nobuyuki Sakurai,Federico Sanchez,A. Sarrat,Takanori Sasaki,Hiroshi Sato,K. Sato,Kate Scholberg,Kate Scholberg,R. Schroeter,M. Sekiguchi,E. Seo,E. Sharkey,A. Shima,Masato Shiozawa,K. K. Shiraishi,G. Sitjes,Michael B. Smy,H. So,Henry W. Sobel,M. Sorel,J. L. Stone,Lawrence Sulak,Y. Suga,A. Suzuki,Yoshihiro Suzuki,M. Tada,Tadayuki Takahashi,M. Takasaki,M. Takatsuki,Y. Takenaga,K. Takenaka,H. Takeuchi,Y. Takeuchi,K. Taki,Y. Takubo,N. Tamura,H. Tanaka,Kenichi Tanaka,Masaaki Tanaka,Y. Tanaka,K. Tashiro,R. Terri,Stephane T'Jampens,A. Tornero-Lopez,T. Toshito,Y. Totsuka,S. Ueda,Mark R. Vagins,L. Whitehead,C. W. Walter,W. Wang,R. J. Wilkes,Shinya Yamada,Y. Yamada,Shoji Yamamoto,Y. Yamanoi,C. Yanagisawa,N. Yershov,H. Yokoyama,Masashi Yokoyama,J. Yoo,Minoru Yoshida,J. Zalipska +220 more
TL;DR: In this article, measurements of {nu}{sub {mu}} disappearance in K2K, the KEK to Kamioka long-baseline neutrino oscillation experiment are presented.
Journal ArticleDOI
Observation of a 6∧∧ He double hypernucleus
Hirotaka Takahashi,J. K. Ahn,J. K. Ahn,H. Akikawa,Shigeki Aoki,K. Arai,Saewoong Bahk,K. M. Baik,B. Bassalleck,J. H. Chung,M. S. Chung,D.H. Davis,Tomokazu Fukuda,K. Hoshino,A. K. Ichikawa,Masaharu Ieiri,K. Imai,Y. H. Iwata,Y. S. Iwata,H. Kanda,H. Kanda,M. Kaneko,Takayoshi Kawai,M. Kawasaki,C. O. Kim,J. Y. Kim,S. J. Kim,Seok Kim,Y. Kondo,Y. Kondo,T. Kouketsu,Y. L. Lee,J. W C McNabb,M. Mitsuhara,Y. Nagase,C. Nagoshi,Kazuma Nakazawa,Hiroyuki Noumi,S. Ogawa,H. Okabe,K. Oyama,H. M. Park,H. M. Park,I. G. Park,J. Parker,Y. S. Ra,Y. S. Ra,J. T. Rhee,Adam Rusek,H. Shibuya,K. S. Sim,P. K. Saha,D. Seki,M. Sekimoto,J. S. Song,T. Takahashi,Fujio Takeutchi,H. Tanaka,K. Tanida,Junji Tojo,H. Torii,S. Torikai,D.N. Tovee,N. Ushida,Kazunuki Yamamoto,Kazunuki Yamamoto,N. Yasuda,J. T. Yang,C. J. Yoon,C. S. Yoon,M. Yosoi,Tomoko Yoshida,L. H. Zhu +72 more
TL;DR: In this article, a double-hyperfragment event has been found in a hybrid-emulsion experiment, which is identified uniquely as the sequential decay of ${}_{\ensuremath{\Lambda}ensureMath{-}0.11}+0.18}\phantom{\rule{0ex}{0ex}}
Journal ArticleDOI
Direct observation of sequential weak decay of a double hypernucleus
Shigeki Aoki,Saewoong Bahk,K. S. Chung,S. H. Chung,H. Funahashi,C.H. Hahn,T. Hara,S. Hirata,K. Hoshino,Masaharu Ieiri,T. Iijima,Kenichi Imai,T. Ishigami,Yoshitaka Itow,M. Kazuno,K. Kikuchi,C. O. Kim,D. C. Kim,J. Y. Kim,M. Kobayashi,K. Kodama,Y. Maeda,Akira Masaike,A. Masuoka,Yasuyuki Matsuda,C. Nagoshi,M. Nakamura,S. Nakanishi,Takashi Z. Nakano,Kazuma Nakazawa,K. Niwa,H. Oda,H. Okabe,S. Ono,R. Ozaki,I. G. Park,Yoshihiro Sato,H. Shibuya,H. M. Shimizu,J. S. Song,M. Sugimoto,H. Tajima,R. Takashima,F. Takeutchi,Kazuhiro Tanaka,M. Teranaka,I. Tezuka,H. Togawa,N. Ushida,S. Watanabe,Takashi Watanabe,J. Yokota,C. S. Yoon +52 more
Journal ArticleDOI
Detection of accelerator produced neutrinos at a distance of 250-km
S. H. Ahn,S.H. An,Shigeki Aoki,H. G. Berns,Hyoungchan Bhang,S. B. Boyd,D. Casper,T. Chikamatsu,J. H. Choi,S. Echigo,M. Etoh,M. Etoh,K. Fujii,S. Fukuda,Y. Fukuda,W. Gajewski,U. Golebiewska,T. Hara,Takehisa Hasegawa,Y. Hayato,J. Hill,S. J. Hong,Masaharu Ieiri,T. Inada,T. Inagaki,T. Ishida,H. Ishii,T. Ishii,Hirokazu Ishino,Masaki Ishitsuka,Yoshitaka Itow,T. Iwashita,H. I. Jang,J. S. Jang,E. J. Jeon,E. M. Jeong,C. K. Jung,T. Kadowaki,Takaaki Kajita,J. Kameda,K. Kaneyuki,I. Kato,Y. Kato,E. Kearns,S. Kenmochi,B. H. Khang,A. Kibayashi,D. Kielczewska,B. J. Kim,C. O. Kim,H. I. Kim,Jung-Hyun Kim,J. Y. Kim,S. B. Kim,S. Kishi,M. Kitamura,Ken-ichiro Kobayashi,Takashi Kobayashi,Y. Kobayashi,M. Kohama,D. G. Koo,Yusuke Koshio,W. R. Kropp,G. Kume,E. Kusano,John G. Learned,H. K. Lee,Jongmin Lee,S. B. Lee,I. T. Lim,S. H. Lim,H. Maesaka,K. Martens,K. Martens,Tomoyuki Maruyama,S. Matsuno,C. Mauger,C. McGrew,M. Minakawa,S. Mine,M. Miura,S. Miyamoto,Kazumasa Miyano,Shigetaka Moriyama,S. Mukai,Masayuki Nakahata,Koji Nakamura,M. Nakamura,Itsuo Nakano,Tsuyoshi Nakaya,Shoei Nakayama,K. Nakayoshi,Kyoshi Nishijima,K. Nishikawa,Shogo Nishiyama,Susumu Noda,Hiroyuki Noumi,Y. Obayashi,J. K. Oh,A. Okada,M. Onchi,T. Otaki,Yuichi Oyama,M. Y. Pac,Hwangseo Park,S. H. Park,Sung Keun Park,A. Sakai,Makoto Sakuda,Nobuyuki Sakurai,N. Sasao,K. Sato,Kate Scholberg,Kate Scholberg,E. Seo,E. Sharkey,K Shiino,A. Shima,Masato Shiozawa,H. So,Henry W. Sobel,A. L. Stachyra,J. L. Stone,Lawrence Sulak,A. Suzuki,Yasunari Suzuki,M. Takasaki,M. Takatsuki,K. Takenaka,H. Takeuchi,Y. Takeuchi,N. Tamura,K. H. Tanaka,Y. Tanaka,K. Tashiro,K. Tauchi,T. Toshito,Y. Totsuka,V. Tumakov,T. Umeda,Mark R. Vagins,C. W. Walter,R. J. Wilkes,Shinya Yamada,T. Yamaguchi,Y. Yamanoi,C. Yanagisawa,H. Yokoyama,H. Yokoyama,J. Yoo,Minoru Yoshida,S. Y. You +151 more
TL;DR: In this article, the neutrino oscillations were detected in coincidence with the expected arrival time of the beam in the 22.5kt fiducial volume of Super-Kamiokande, the far detector at 250 km distance.
Journal ArticleDOI
Evidence for in-medium modification of the phi meson at normal nuclear density.
Ryotaro Muto,J. Chiba,H. En'yo,Yoichiro Fukao,H. Funahashi,Hideki Hamagaki,Masaharu Ieiri,Masaya Ishino,Hiroki Kanda,Masaaki Kitaguchi,Satoshi Mihara,K. Miwa,T. Miyashita,T. Murakami,T. Nakura,Megumi Naruki,Kyoichiro Ozawa,Fuminori Sakuma,Osamu Sasaki,M. Sekimoto,T. Tabaru,Kazuhiro Tanaka,M. Togawa,S. Yamada,S. Yokkaichi,Y. Yoshimura +25 more
TL;DR: This study has experimentally verified vector meson mass modification at normal nuclear density through measured invariant mass spectra of e(+) e(-) pairs.