Measurement of y_CP in D⁰ meson decays to the K_S⁰K⁺K^- final state

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A. Zupanc,¹⁴ I. Adachi,⁸ H. Aihara,⁴⁴ K. Arinstein,^1,31 V. Aulchenko,^1,31 T. Aushev,^18,13 A. M. Bakich,³⁹ V. Balagura,¹³ E. Barberio,²¹ A. Bay,¹⁸ K. Belous,¹² M. Bischofberger,²³ A. Bozek,²⁷ M. Bračko,^20,14 J. Brodzicka,⁸ T. E. Browder,⁷ M.-C. Chang,⁴ Y. Chao,²⁶ A. Chen,²⁴ B. G. Cheon,⁶ C.-C. Chiang,²⁶ I.-S. Cho,⁴⁸ Y. Choi,³⁸ J. Dalseno,⁸ A. Drutskoy,² W. Dungel,¹¹ S. Eidelman,^1,31 N. Gabyshev,^1,31 P. Goldenzweig,² B. Golob,^19,14 H. Ha,¹⁶ J. Haba,⁸ B.-Y. Han,¹⁶ T. Hara,⁸ Y. Hasegawa,³⁷ K. Hayasaka,²² H. Hayashii,²³ M. Hazumi,⁸ Y. Hoshi,⁴² H. J. Hyun,¹⁷ K. Inami,²² A. Ishikawa,³⁴ R. Itoh,⁸ M. Iwasaki,⁴⁴ N. J. Joshi,⁴⁰ D. H. Kah,¹⁷ J. H. Kang,⁴⁸ P. Kapusta,²⁷ N. Katayama,⁸ T. Kawasaki,²⁹ H. O. Kim,¹⁷ Y. I. Kim,¹⁷ Y. J. Kim,⁵ K. Kinoshita,² B. R. Ko,¹⁶ S. Korpar,^20,14 P. Križan,^19,14 P. Krokovny,⁸ R. Kumar,³³ Y.-J. Kwon,⁴⁸ S.-H. Kyeong,⁴⁸ M. J. Lee,³⁶ T. Lesiak,^27,3 J. Li,⁷ C. Liu,³⁵ Y. Liu,²² R. Louvot,¹⁸ A. Matyja,²⁷ S. McOnie,³⁹ K. Miyabayashi,²³ H. Miyata,²⁹ Y. Miyazaki,²² R. Mizuk,¹³ Y. Nagasaka,⁹ E. Nakano,³² M. Nakao,⁸ Z. Natkaniec,²⁷ S. Nishida,⁸ K. Nishimura,⁷ O. Nitoh,⁴⁶ S. Ogawa,⁴¹ T. Ohshima,²² S. Okuno,¹⁵ H. Ozaki,⁸ P. Pakhlov,¹³ G. Pakhlova,¹³ C. W. Park,³⁸ H. Park,¹⁷ H. K. Park,¹⁷ R. Pestotnik,¹⁴ L. E. Piilonen,⁴⁷ A. Poluektov,^1,31 H. Sahoo,⁷ K. Sakai,²⁹ Y. Sakai,⁸ O. Schneider,¹⁸ A. J. Schwartz,² A. Sekiya,²³ K. Senyo,²² M. E. Sevior,²¹ M. Shapkin,¹² C. P. Shen,⁷ J.-G. Shiu,²⁶ B. Shwartz,^1,31 J. B. Singh,³³ A. Sokolov,¹² S. Stanič,³⁰ M. Starič,¹⁴ T. Sumiyoshi,⁴⁵ G. N. Taylor,²¹ Y. Teramoto,³² K. Trabelsi,⁸ S. Uehara,⁸ Y. Unno,⁶ S. Uno,⁸ P. Urquijo,²¹ Y. Usov,^1,31 G. Varner,⁷ K. E. Varvell,³⁹ K. Vervink,¹⁸ A. Vinokurova,^1,31 C. H. Wang,²⁵ M.-Z. Wang,²⁶ P. Wang,¹⁰ Y. Watanabe,¹⁵ R. Wedd,²¹ E. Won,¹⁶ B. D. Yabsley,³⁹ H. Yamamoto,⁴³ Y. Yamashita,²⁸ Z. P. Zhang,³⁵ V. Zhilich,^1,31 V. Zhulanov,^1,31 T. Zivko,¹⁴ and O. Zyukova^1,31

(Belle Collaboration)

¹Budker Institute of Nuclear Physics, Novosibirsk
²University of Cincinnati, Cincinnati, Ohio 45221
³T. Kosciuszko Cracow University of Technology, Krakow
⁴Department of Physics, Fu Jen Catholic University, Taipei
⁵The Graduate University for Advanced Studies, Hayama
⁶Hanyang University, Seoul
⁷University of Hawaii, Honolulu, Hawaii 96822
⁸High Energy Accelerator Research Organization (KEK), Tsukuba
⁹Hiroshima Institute of Technology, Hiroshima
¹⁰Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
¹¹Institute of High Energy Physics, Vienna
¹²Institute of High Energy Physics, Protvino
¹³Institute for Theoretical and Experimental Physics, Moscow
¹⁴J. Stefan Institute, Ljubljana
¹⁵Kanagawa University, Yokohama
¹⁶Korea University, Seoul
¹⁷Kyungpook National University, Taegu
¹⁸École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
¹⁹Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
²⁰University of Maribor, Maribor
²¹University of Melbourne, School of Physics, Victoria 3010
²²Nagoya University, Nagoya
²³Nara Women's University, Nara
²⁴National Central University, Chung-li
²⁵National United University, Miao Li
²⁶Department of Physics, National Taiwan University, Taipei
²⁷H. Niewodniczanski Institute of Nuclear Physics, Krakow
²⁸Nippon Dental University, Niigata
²⁹Niigata University, Niigata
³⁰University of Nova Gorica, Nova Gorica
³¹Novosibirsk State University, Novosibirsk
³²Osaka City University, Osaka
³³Panjab University, Chandigarh
³⁴Saga University, Saga
³⁵University of Science and Technology of China, Hefei
³⁶Seoul National University, Seoul
³⁷Shinshu University, Nagano
³⁸Sungkyunkwan University, Suwon
³⁹University of Sydney, Sydney, New South Wales
⁴⁰Tata Institute of Fundamental Research, Mumbai
⁴¹Toho University, Funabashi
⁴²Tohoku Gakuin University, Tagajo
⁴³Tohoku University, Sendai
⁴⁴Department of Physics, University of Tokyo, Tokyo
⁴⁵Tokyo Metropolitan University, Tokyo
⁴⁶Tokyo University of Agriculture and Technology, Tokyo
⁴⁷IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
⁴⁸Yonsei University, Seoul

Received 26 May 2009; published 18 September 2009

Wepresent a measurement of the D⁰-[overline D]⁰ mixing parameter y_CP usinga flavor-untagged sample of D⁰-->K_S⁰K⁺K^- decays. The measurement is basedon a 673 fb^-1 data sample recorded with the Belle detectorat the KEKB asymmetric-energy e⁺e^- collider. Using a method basedon measuring the mean decay time for different K⁺K^- invariantmass intervals, we find y_CP=(+0.11±0.61(stat.)±0.52(syst.))%.

URL:	http://link.aps.org/doi/10.1103/PhysRevD.80.052006
DOI:	10.1103/PhysRevD.80.052006
PACS:	13.25.Ft; 12.15.Ff 13.25.Ft Hadronic decays of charmed mesons 12.15.Ff Quark and lepton masses and mixing YEAR: 2009

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