Masashi Hazumi
KEK
761 Papers
8.2K Citations
Masashi Hazumi is an academic researcher from KEK. The author has contributed to research in topics: Cosmic microwave background & KEKB. The author has an hindex of 87, co-authored 708 publications. Previous affiliations of Masashi Hazumi include Japan Aerospace Exploration Agency & University of Sydney.
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Papers
Experimental constraints on the possible J**P quantum numbers of the Lambda(c)(2880)+
Kazuo Abe,Y. Chao,A. Murakami,D. Liventsev,R. Kulasiri,Y.-T. Shen,D. Epifanov,Y. Asano,H. Kichimi,Y.F. Tse,G. R. Moloney,R. Pestotnik,H. Shibuya,S. Cole,Sadaharu Uehara,S. L. Olsen,K. Hayasaka,K. Sumisawa,Hyunyong Kim,J.H. Choi,M. D. Peters,M. H. Tanaka,K. Aoki,Young-Il Choi,Y. Kozakai,C. Z. Yuan,R. Seidl,C.Y. Lin,N. Katayama,U. Bitenc,Kimitaka Itoh,H. Park,L.M. Zhang,P. Schonmeier,J. Wicht,Anton Poluektov,S. Okuno,Jolanta Brodzicka,R. Dowd,S. W. Lin,Kai-Feng Chen,B. G. Cheon,Z. P. Zhang,S. R. Hou,Hirokazu Ishino,T. Tsuboyama,Jie Zhang,A. Ogawa,B. Golob,K. Arinstein,Toru Iijima,A. Ishikawa,J. S. Lange,M. Iwasaki,Q. L. Xie,S. Fratina,N. Kishimoto,A. Bozek,A. Matyja,Matthew Jones,S. Y. Suzuki,Y. Watanabe,K. Inami,A. Somov,F. Takasaki,J. Li,V.N. Zhilich,D. Anipko,K. Hara,Y. Miyazaki,H. Hayashii,J. S. H. Lee,Antonio Limosani,S. Uno,Frederic Jean Ronga,Y. Sakai,J. Haba,W. A. Mitaroff,S. Korpar,S. Banerjee,A. Bay,P. Krizan,D. Mohapatra,S. Ogawa,C. Jacoby,Gobinda Majumder,O. Schneider,K. Nishimura,T. Aushev,S.L. Zang,Nobuaki Sato,V.A. Sidorov,H. Nakazawa,H. Stoeck,E. Won,R. Mizuk,Andrej Gorišek,T. Higuchi,L. E. Piilonen,Bruce Yabsley,Yoji Hasegawa,N. Tamura,J. Schümann,K. Ueno,E. Kurihara,W. Ostrowicz,L. Hinz,Tatiana Medvedeva,N. Parslow,H. Kakuno,T. Tsukamoto,M. Bračko,Z. Natkaniec,V. M. Aulchenko,H. Fujii,S. E. Lee,H. Yamamoto,T. Hokuue,W. T. Chen,M. Rozanska,K. Kinoshita,N.I. Root,K. Ikado,N. Kikuchi,S. Ono,Y. Igarashi,I. Adachi,Tariq Aziz,Rakesh Kumar,M. E. Sevior,K. Senyo,K. Neichi,Takashi Kubota,M. Dash,O. Nitoh,G. Leder,Y. Unno,H. Sakaue,Marco Barbero,S. L. Blyth,T. Mori,P. Chang,J. Wiechczynski,Y. Hoshi,I. Tikhomirov,R. Chistov,Y. J. Kwon,D. Zurcher,X. C. Tian,M. Watanabe,Osamu Tajima,Daniel Robert Marlow,T. Okabe,K. Belous,E. L. Barberio,K. Tanabe,H. Sahoo,T. Nakagawa,H. R. Khan,A. Imoto,N. Soni,W. S. Hou,S. Yoshino,Akito Kusaka,J. S. Kang,K. Hoshina,Y. Mikami,S. Eidelman,G. Gokhroo,C. W. Park,Yuji Enari,S. McOnie,H. Ha,S. U. Kataoka,A. Go,M. Nakao,Y. Uchida,T. Nozaki,Phillip Urquijo,Hiroaki Aihara,Vladislav Balagura,P. Goldenzweig,Y. Ban,I. Bedny,M. Starič,Tsukasa Aso,C. C. Zhang,M. Z. Wang,C. Schwanda,K. Tamai,J. B. Singh,H. Palka,K. Uchida,T. Sumiyoshi,A. Chen,T. Kawasaki,A. Sugiyama,Rainer Stamen,M. Pernicka,S. Villa,M. C. Chang,T. E. Browder,N. Gabyshev,Y. Ushiroda,Jeremy Dalseno,A. Drutskoy,P. Krokovny,A. J. Schwartz,S. Saitoh,Y. Choi,P. Pakhlov,Shimpei Yamamoto,Yu Nakahama,Jung-Hyun Kim,C. C. Wang,M. Iwabuchi,L. S. Peak,S. Noguchi,M. Shapkin,G. N. Taylor,Yasushi Nagasaka,M. Grosse Perdekamp,D. Heffernan,Tapas Sarangi,H. Guler,T. Nagamine,T. Uglov,A.E. Bondar,N. Takada,Y. J. Kim,T. Matsumoto,Hiroshi Sakamoto,I. Nakamura,B. Shwartz,James Mueller,Y. Teramoto,A. Kibayashi,C. H. Wang,H. Miyata,G. S. Varner,J. Dragic,A. M. Bakich,H. Miyake,N. Satoyama,K. Trabelsi,P. Kapusta,K. Miyabayashi,Seema Bahinipati,T. Ziegler,Y. Yusa,R. Itoh,L. Widhalm,Samo Stanič,Y.-J. Lee,S. K. Choi,K. Sayeed,A. Zupanc,Jamal Rorie,Y. Iwasaki,T.H. Kim,S. Y. Suzuki,M. Danilov,Y.T. Tsai,A. Sokolov,C.-H. Wu,J. H. Kang,T. Schietinger,A. Kuzmin,You-Jin Yuan,Kevin Varvell,T. Seki,Ilija Bizjak,Y. B. Hsiung,Y. F. Liu,Masahiro Fujikawa,Masashi Hazumi,E. Nakano,G. Pakhlova,T. Lesiak,S. Nishida,C. C. Kuo,K. S. Park,A. Yamaguchi,T. Hara,H. O. Kim,A. Garmash,S. K. Kim,N. C. Hastings,F. Mandl,M. Yamauchi,T. Ohshima,T. Arakawa,J. MacNaughton,H. Ozaki,A. Chuvikov,Y. Yamashita,T. J. Gershon,Y. Usov +297 more
TL;DR: The first observation of Lambda(c)(2940)(+)-->Sigma( c)(2455)(0,++)pi(+,-) decay is reported and Lambda (c)(2880)(+) and Lambdas(c))(29 40)(+) mass and width parameters are measured.
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Observation of large CP violation and evidence for direct CP violation in B0 → π+ π- decays
Kazuo Abe,N. Abe,T. Abe,I. Adachi,Hiroaki Aihara,K. Akai,M. Akatsu,M. Akemoto,Y. Asano,Tsukasa Aso,V. M. Aulchenko,T. Aushev,A. M. Bakich,Y. Ban,S. Banerjee,A. Bay,I. Bedny,I. Bizjak,A. Bondar,A. Bozek,M. Bračko,T. E. Browder,Y. Chao,K. F. Chen,Byung Gu Cheon,R. Chistov,S. K. Choi,Y. Choi,A. Chuvikov,S. Cole,M. Danilov,J. Dragic,A. Drutskoy,S. Eidelman,V. Eiges,Yuji Enari,D. Epifanov,J.W. Flanagan,Kazuro Furukawa,N. Gabyshev,A. Garmash,T. J. Gershon,B. Golob,J. Haba,K. Hara,N. C. Hastings,H. Hayashii,Masashi Hazumi,L. Hinz,T. Hokuue,Y. Hoshi,W. S. Hou,Y. B. Hsiung,H. C. Huang,T. Iijima,Hirokazu Ikeda,K. Inami,A. Ishikawa,Hirokazu Ishino,R. Itoh,Hiroyuki Iwasaki,M. Iwasaki,Y. Iwasaki,H. Kakuno,Takuya Kamitani,J. H. Kang,J. S. Kang,P. Kapusta,S. U. Kataoka,N. Katayama,H. Kawai,T. Kawasaki,A. Kibayashi,H. Kichimi,Eiji Kikutani,H. J. Kim,Jung-Hyun Kim,Seong Keun Kim,K. Kinoshita,Patrick Koppenburg,S. Korpar,P. Križan,P. Krokovny,Suneel Kumar,A.S. Kuzmin,Y. J. Kwon,J. S. Lange,G. Leder,S. H. Lee,Y. J. Lee,T. Lesiak,J. Li,Antonio Limosani,S. W. Lin,D. Liventsev,J. MacNaughton,F. Mandl,Daniel Robert Marlow,H. Matsumoto,T. Matsumoto,A. Matyja,Shinichiro Michizono,Toshihiro Mimashi,W. A. Mitaroff,K. Miyabayashi,H. Miyake,H. Miyata,D. Mohapatra,G. R. Moloney,A. Murakami,T. Nagamine,Yasushi Nagasaka,T. Nakadaira,Takashi Nakamura,E. Nakano,M. Nakao,H. Nakazawa,Z. Natkaniec,K. Neichi,S. Nishida,O. Nitoh,S. Noguchi,T. Nozaki,S. Ogawa,Y. Ogawa,K. Ohmi,T. Ohshima,Norihito Ohuchi,Katsunobu Oide,T. Okabe,S. Okuno,S. L. Olsen,W. Ostrowicz,H. Ozaki,P. Pakhlov,H. Palka,C. W. Park,H. Park,N. Parslow,L. E. Piilonen,N.I. Root,M. Rozanska,Hiroyuki Sagawa,Y. Sakai,O. Schneider,J. Schümann,C. Schwanda,A. J. Schwartz,S. Semenov,K. Senyo,H. Shibuya,Tetsuo Shidara,B. Shwartz,V.A. Sidorov,Jasvinder A. Singh,N. Soni,Rainer Stamen,S. Stanič,M. Starič,Ryuhei Sugahara,K. Sumisawa,T. Sumiyoshi,Kei Suzuki,S. Y. Suzuki,Osamu Tajima,F. Takasaki,K. Tamai,N. Tamura,M. H. Tanaka,Masafumi Tawada,Y. Teramoto,T. Tomura,T. Tsuboyama,T. Tsukamoto,S. Uehara,T. Uglov,K. Ueno,Y. Unno,S. Uno,G. S. Varner,Kevin Varvell,C. C. Wang,C. H. Wang,M. Z. Wang,Y. Watanabe,B. D. Yabsley,Yasuhiko Yamada,A. Yamaguchi,Y. Yamashita,M. Yamauchi,H. Yanai,Heyoung Yang,J. Ying,Masashi Yokoyama,M. Yoshida,Y. Yusa,C. C. Zhang,Zhenyu Zhang,T. Ziegler,D. Žontar,D. Zürcher +200 more
TL;DR: The first observation of CP violation in B0-->pi(+)pi(-) decays based on 152x10(6) gamma (4S)-->BB decays collected with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider is reported.
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Second Season QUIET Observations: Measurements of the CMB Polarization Power Spectrum at 95 GHz
Derek Araujo,Colin A. Bischoff,A. Brizius,I. Buder,Yuji Chinone,K. A. Cleary,R. N. Dumoulin,Akito Kusaka,R. Monsalve,Sigurd Naess,Laura Newburgh,R. Reeves,Ingunn Kathrine Wehus,Jonathan T. L. Zwart,Leonardo Bronfman,Ricardo Bustos,Sarah E. Church,Clive Dickinson,H. K. Eriksen,T. C. Gaier,J. O. Gundersen,Masaya Hasegawa,Masashi Hazumi,Kevin M. Huffenberger,Koji Ishidoshiro,M. Jones,Pekka Kangaslahti,D. J. Kapner,Donna Kubik,Charles R. Lawrence,Michele Limon,Jeff McMahon,Amber Miller,Makoto Nagai,H. Nguyen,G. W. Nixon,T. J. Pearson,Lucio Piccirillo,Simon J. E. Radford,A. C. S. Readhead,J. L. Richards,D. F. E. Samtleben,M. D. Seiffert,Martin C. Shepherd,K. M. Smith,S. T. Staggs,Osamu Tajima,K. L. Thompson,K. Vanderlinde,R. Williamson +49 more
TL;DR: In this paper, the authors report the measurement of CMB polarization power spectra using the 95-GHz data using two independent analysis pipelines, one based on a pseudo-Cl (PCL) cross-correlation approach, and the other on a maximum-likelihood (ML) approach.
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Observation of the DecayB→Kl+l−
Kazuo Abe,R. Abe,I. Adachi,Byoung Sup Ahn,H. Aihara,M. Akatsu,Y. Asano,Tsukasa Aso,V. M. Aulchenko,T. Aushev,A. M. Bakich,Elzbieta Banas,S. Behari,P. K. Behera,A.E. Bondar,A. Bozek,T. E. Browder,B. C. K. Casey,P. Chang,Y. Chao,B. G. Cheon,R. Chistov,S. K. Choi,Y. Choi,L. Y. Dong,A. Drutskoy,S. Eidelman,Yuji Enari,F. Fang,H. Fujii,Chikara Fukunaga,Masaki Fukushima,N. Gabyshev,A. Garmash,T. J. Gershon,Ascelin Gordon,K. Gotow,R. Guo,J. Haba,H. Hamasaki,Kazunori Hanagaki,F. Handa,K. Hara,T. Hara,N. C. Hastings,H. Hayashii,Masashi Hazumi,E. M. Heenan,I. Higuchi,T. Higuchi,H. Hirano,T. Hojo,T. Hokuue,Y. Hoshi,K. Hoshina,S. R. Hou,W. S. Hou,Shih-Chieh Hsu,H. C. Huang,Y. Igarashi,T. Iijima,Hirokazu Ikeda,K. Inami,A. Ishikawa,Hirokazu Ishino,R. Itoh,Hiroyuki Iwasaki,Y. Iwasaki,David A. Jackson,H. K. Jang,H. Kakuno,J. Kaneko,J. H. Kang,J. S. Kang,P. Kapusta,N. Katayama,Hikaru Kawai,Naritoshi Kawamura,T. Kawasaki,H. Kichimi,D. W. Kim,Heejong Kim,Hyunyong Kim,H. O. Kim,Hyun Woo Kim,S. K. Kim,K. Kinoshita,S. Kobayashi,Hideyuki Konishi,P. Krokovny,R. Kulasiri,S. Kumar,A. Kuzmin,Y. J. Kwon,J. S. Lange,G. Leder,S. H. Lee,D. Liventsev,Rong-Shyang Lu,J. MacNaughton,Takahiko Matsubara,S. Matsumoto,T. Matsumoto,Y. Mikami,K. Miyabayashi,Hirokazu Miyake,H. Miyata,G. R. Moloney,G.F. Moorhead,Shigeki Mori,T. Mori,A. Murakami,T. Nagamine,Yasushi Nagasaka,Yoshihiko Nagashima,T. Nakadaira,E. Nakano,M. Nakao,J. W. Nam,Z. Natkaniec,K. Neichi,S. Nishida,O. Nitoh,S. Noguchi,T. Nozaki,S. Ogawa,T. Ohshima,T. Okabe,S. Okuno,S. L. Olsen,W. Ostrowicz,H. Ozaki,P. Pakhlov,H. Palka,Changwon Park,C. W. Park,H. Park,K. S. Park,L. S. Peak,M. D. Peters,L. E. Piilonen,J. L. Rodriguez,N.I. Root,M. Rozanska,Krzysztof A. Rybicki,J. Ryuko,Hiroyuki Sagawa,Y. Sakai,Hiroshi Sakamoto,A. Satpathy,S. Schrenk,S. Semenov,K. Senyo,M. E. Sevior,H. Shibuya,B. Schwartz,Samo Stanič,A. Sugi,A. Sugiyama,K. Sumisawa,T. Sumiyoshi,Kei Suzuki,S. Y. 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,Makoto Tomoto,T. Tomura,S.N. Tovey,K. Trabelsi,T. Tsuboyama,T. Tsukamoto,S. Uehara,K. Ueno,Y. Unno,S. Uno,Y. Ushiroda,Kevin Varvell,C. C. Wang,C. H. Wang,J. G. Wang,M. Z. Wang,Y. Watanabe,E. Won,Bruce Yabsley,Yasuhiko Yamada,M. Yamaga,A. Yamaguchi,H. Yamamoto,Y. Yamashita,M. Yamauchi,J. Yashima,Masashi Yokoyama,Kyo Yoshida,Y. Yusa,H. Yuta,C. C. Zhang,Jia-ju Zhang,H. W. Zhao,Y. Zheng,V.N. Zhilich,D. Žontar +211 more
TL;DR: In this paper, the authors reported a search for the flavor-changing neutral current decay with the Belle detector at the KEKB storage ring, and observed the decay process with a branching fraction.
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Measurement of Time-DependentCP-Violating Asymmetries inB0→ϕKS0,K+K−KS0, andη′KS0Decays
Kazuo Abe,T. Abe,I. Adachi,H. Aihara,K. Akai,M. Akatsu,Y. Asano,Tsukasa Aso,T. Aushev,Seema Bahinipati,A. M. Bakich,Y. Ban,S. Banerjee,I. Bedny,I. Bizjak,A.E. Bondar,A. Bozek,M. Bračko,Jolanta Brodzicka,T. E. Browder,M. C. Chang,P. Chang,Y. Chao,K. F. Chen,B. G. Cheon,R. Chistov,S. K. Choi,Y. Choi,Young-Il Choi,A. Chuvikov,M. Danilov,L. Y. Dong,S. Eidelman,V. Eiges,Yuji Enari,J.W. Flanagan,Chikara Fukunaga,Kazuro Furukawa,N. Gabyshev,A. Garmash,T. J. Gershon,B. Golob,R. Guo,J. Haba,Caren Hagner,K. Hara,T. Hara,N. C. Hastings,H. Hayashii,Masashi Hazumi,I. Higuchi,T. Higuchi,T. Hokuue,Y. Hoshi,W. S. Hou,Y. B. Hsiung,H. C. Huang,Y. Igarashi,T. Iijima,Hirokazu Ikeda,K. Inami,A. Ishikawa,Hirokazu Ishino,R. Itoh,Hiroyuki Iwasaki,Motoki Iwasaki,Y. Iwasaki,Takuya Kamitani,J. H. Kang,J. S. Kang,P. Kapusta,S. U. Kataoka,N. Katayama,Hikaru Kawai,T. Kawasaki,H. Kichimi,M. Kikuchi,Eiji Kikutani,Hyunyong Kim,Hyun Woo Kim,Jung-Hyun Kim,S. K. Kim,K. Kinoshita,Haruyo Koiso,Patrick Koppenburg,S. Korpar,P. Križan,P. Krokovny,S. Kumar,Y. J. Kwon,J. S. Lange,G. Leder,S. H. Lee,T. Lesiak,J. Li,Antonio Limosani,S. W. Lin,D. Liventsev,J. MacNaughton,F. Mandl,Daniel Robert Marlow,Mika Masuzawa,T. Matsumoto,A. Matyja,Shinichiro Michizono,Toshihiro Mimashi,W. A. Mitaroff,K. Miyabayashi,Hirokazu Miyake,H. Miyata,D. Mohapatra,T. Mori,A. Murakami,T. Nagamine,Yasushi Nagasaka,T. Nakadaira,Takashi Nakamura,E. Nakano,M. Nakao,Z. Natkaniec,S. Nishida,O. Nitoh,T. Nozaki,S. Ogawa,Y. Ogawa,K. Ohmi,Yukiyoshi Ohnishi,T. Ohshima,Norihito Ohuchi,Katsunobu Oide,T. Okabe,S. Okuno,S. L. Olsen,Y. Onuki,W. Ostrowicz,H. Ozaki,P. Pakhlov,H. Palka,C. W. Park,H. Park,M. D. Peters,L. E. Piilonen,N.I. Root,M. Rozanska,Hiroyuki Sagawa,S. Saitoh,Y. Sakai,M. Satapathy,A. Satpathy,O. Schneider,J. Schümann,C. Schwanda,A. J. Schwartz,S. Semenov,K. Senyo,M. E. Sevior,T.-A. Shibata,H. Shibuya,Tetsuo Shidara,B. Shwartz,Vladimir A. Sidorov,J. B. Singh,N. Soni,Samo Stanič,Ryuhei Sugahara,A. Sugi,Takashi Sugimura,A. Sugiyama,K. Sumisawa,T. Sumiyoshi,Kei Suzuki,S. Y. Suzuki,S. Y. Suzuki,F. Takasaki,N. Tamura,J. Tanaka,M. Tanaka,Masafumi Tawada,Y. Teramoto,T. Tomura,K. Trabelsi,T. Tsuboyama,T. Tsukamoto,S. Uehara,K. Ueno,Y. Unno,S. Uno,Y. Ushiroda,S. E. Vahsen,G. S. Varner,Kevin Varvell,C. C. Wang,C. H. Wang,J. G. Wang,M. Z. Wang,Y. Watanabe,E. Won,Bruce Yabsley,Yasuhiko Yamada,A. Yamaguchi,H. Yamamoto,N. Yamamoto,Y. Yamashita,M. Yamauchi,H. Yanai,Heyoung Yang,J. Ying,Masashi Yokoyama,M. Yoshida,You-Jin Yuan,Y. Yusa,C. C. Zhang,Jia-ju Zhang,Z. P. Zhang,Y. Zheng,V.N. Zhilich,D. Žontar,D. Zurcher +217 more
TL;DR: In this paper, an improved measurement of $CP$-violation parameters was presented based on the asymmetries in the distributions of the proper-time intervals between the two $B$ decays.
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