K
Kumataro Ukai
Researcher at University of Tokyo
Publications - 72
Citations - 1260
Kumataro Ukai is an academic researcher from University of Tokyo. The author has contributed to research in topics: Photon & Pair production. The author has an hindex of 16, co-authored 72 publications receiving 1222 citations.
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Journal ArticleDOI
A study of K - π + scattering in the reaction K - p→K - π + n at 11 GeV/ c
D. Aston,N. Awaji,T. Bienz,F. Bird,J. D'Amore,W. Dunwoodie,R. Endorf,K. Fujii,H. Hayashi,S. Iwata,W.B. Johnson,R. Kajikawa,P. Kunz,D. W. G. S. Leith,L. Levinson,T. Matsui,Brian Meadows,A. Miyamoto,M. Nussbaum,Hitoshi Ozaki,C.O. Pak,B.N. Ratcliff,D.C. Schultz,S. L. Shapiro,T. Shimomura,P.K. Sinervo,A. Sugiyama,Shiro Suzuki,G. Tarnopolsky,T. Tauchi,N. Toge,Kumataro Ukai,A. P. Waite,S. H. Williams +33 more
TL;DR: The mass dependence of the spherical harmonic moments provided clear evidence for the production of the complete leading orbitally excited K∗ series up through JP = 5− as discussed by the authors, and also provided new evidence for underlying states.
Journal ArticleDOI
New upper bound on the electron anti-neutrino mass☆
Hirokane Kawakami,S. Kato,T. Ohshima,S. Shibata,Kumataro Ukai,Naotake Morikawa,Norio Nogawa,K. Haga,T. Nagafuchi,M. Shigeta,Yasutaka Fukushima,T. Taniguchi +11 more
TL;DR: In this paper, an upper bound ofmv < 13 eV at 95% CL has been obtained on the electron anti-neutrino mass, which is based on a more than tenfold improvement in data relative to previous measurements of the β-spectrum in 3H decay.
Journal ArticleDOI
A study of the Ks0Ks0 system in the reaction K−p→Ks0Ks0Λ at 11 GeV/c
D. Aston,N. Awaji,T. Bienz,F. Bird,J. D'Amore,W. Dunwoodie,R. Endorf,K. Fujii,H. Hayashii,S. Iwata,W.B. Johnson,R. Kajikawa,P. Kunz,D. W. G. S. Leith,L. Levinson,T. Matsui,Brian Meadows,A. Miyamoto,M. Nussbaum,Hitoshi Ozaki,C.O. Pak,B.N. Ratcliff,D.C. Schultz,S. L. Shapiro,T. Shimomura,P.K. Sinervo,A. Sugiyama,Shiro Suzuki,G. Tarnopolsky,T. Tauchi,N. Toge,Kumataro Ukai,A. P. Waite,S. H. Williams +33 more
TL;DR: In this paper, a 4.1 event/nb sample of 11 GeV/c K−p interactions in the LASS spectrometer at SLAC has been used in an analysis of the exclusive Ks0Ks0Λ final state.
Journal ArticleDOI
Evidence for two strangeonium resonances with JPC=1++ and 1+− in K−p interactions at 11 GeV/c
D. Aston,N. Awaji,T. Bienz,F. Bird,J. D'Amore,W. Dunwoodie,R. Endorf,K. Fujii,H. Hayashi,S. Iwata,W.B. Johnson,R. Kajikawa,P. Kunz,D. W. G. S. Leith,L. Levinson,T. Matsui,Brian Meadows,A. Miyamoto,M. Nussbaum,Hitoshi Ozaki,C.O. Pak,B.N. Ratcliff,D.C. Schultz,S. L. Shapiro,T. Shimomura,P.K. Sinervo,A. Sugiyama,Shiro Suzuki,G. Tarnopolsky,T. Tauchi,N. Toge,Kumataro Ukai,A. P. Waite,S. H. Williams +33 more
TL;DR: In this paper, the results of a partial wave analysis of the low mass KKπ system produced in the reactions K−p→K0sK±π±Λ at 11 GeV/c using the LASS spectrometer are presented.
Journal ArticleDOI
Search for Top Quark in e+e- Collisions at sqrt[s]=52 GeV
I. Adachi,H. Aihara,H. B. Dijkstra,Ryoji Enomoto,H. Fujii,Keisuke Fujii,Toshitsugu Fujii,Junpei Fujimoto,N. Fujiwara,H. Hayashii,S. Higashi,Naoko Iida,A. Imanishi,Hirokazu Ikeda,T. Ishii,R. Itoh,Hiroyuki Iwasaki,Shuichi Iwata,R. Kajikawa,T. Kamae,S. Kato,S. Kawabata,H. Kichimi,T. Kishida,Makoto Kobayashi,S. Kuroda,N. Kusuki,A. Maruyama,K. Maruyama,H. Masuda,Tomohiro Matsuda,Akiya Miyamoto,T. Morimoto,K. Nakamura,O. Nitoh,S. Noguchi,F. Ochiai,Hiroshi G. Okuno,T. Okusawa,T. Ohshima,H. Ozaki,Toru Sato,Fuminori Sai,J. Shimonaka,K. Shimozawa,A. Shirahashi,Ryuhei Sugahara,A. Sugiyama,Shiro Suzuki,T. Suwada,K. Takahashi,T. Takahashi,H. Takamure,T. Tanaka,Toshiaki Tauchi,Y. Teramoto,T. Tsukamoto,Kumataro Ukai,S. Uno,Y. X. Watanabe,O. Yamakawa,Akira Yamamoto,S. Yamamoto,S. Yamashita,M. Yamauchi,Y. Yoshimura,M. Yoshioka +66 more
TL;DR: In this article, the authors search for possible signatures of top-quark production in 508 e/sup +/e/sup -/ hadronic annihilation events collected at the TOPAZ detector at the KEK e/Sup + /e/Sup -/ collider TRISTAN and obtain a lower bound of 25.8 GeV on the mass of the lightest top meson.