Observation Of D-0-(D)Over-Bar(0) Mixing In E(+) E(-) Collisions B R Ko , E Won , I Adachi , H Aihara , K Arinstein , D M Asner , V Aulchenko , T Aushev , A Bala , V Bhardwaj , B Bhuyan , A Bobrov , A Bondar , A Bozek , M Bracko , T E Browder , D Cervenkov , A Chen , B G Cheon , K Chilikin , R Chistov , I S Cho , K Cho , V Chobanova , S K Choi , Yoojoo Choi , D Cinabro , J Dalseno , M Danilov , Z Dolezal , Z Drasal , D Dutta , K Dutta , S Eidelman , D Epifanov , H Farhat , J Fast , T Ferber , V K Gaur , S Ganguly , A Garmash , R Gillard , R Glattauer , Y M Goh , B Golob , J Haba , T Hara , H Hayashii , X H He , Toshiro Higuchi , Y Hoshi , W S Hou , H J Hyun , T Iijima , A Ishikawa , R Itoh , Y Iwasaki , Tomomi Iwashita , I Jaegle , T Julius , Tomonori Kawasaki , C Kiesling , D Y Kim , J H Kim , Min Ju Kim , Y J Kim , J Klucar , P Kodys , S Korpar , P Krizan , P Krokovny , T Kuhr , T Kumita , A Kuzmin , Y J Kwon , J S Lange , Sung Haeng Lee , J Li , Youji Li , J Libby , Chiayih Liu , Z Q Liu , P Lukin , D Matvienko , K Miyabayashi , H Miyata , G B Mohanty , A Moll , R Mussa , Y Nagasaka , E Nakano , Masashi Nakao , Z Natkaniec , M Nayak , E Nedelkovska , N K Nisar , O Nitoh , Satoshi Ogawa , S Okuno , G Pakhlova , C W Park , H K Park , T K Pedlar , Tao Peng , M Petric , L E Piilonen , M Ritter , M Roehrken , A Rostomyan , S Ryu , H Sahoo , Yuko Sakai , L Santelj , T Sanuki , V Savinov , O Schneider , G Schnell , C Schwanda , A J Schwartz , R Seidl , O Seon , M E Sevior , M Shapkin , C P Shen , T A Shibata , J G Shiu , B Shwartz , A Sibidanov , F Simon , J B Singh , Y S Sohn , A Sokolov , S Stanic , M Staric , M Steder , T Sumiyoshi , U Tamponi , G Tatishvili , Y Teramoto , K Trabelsi , M Uchida , S Uehara , T Uglov , Y Unno , S Uno , P Urquijo , Y Usov , S Vahsen , C Van Hulse , P Vanhoefer , G Varner , A Vinokurova , V Vorobyev , M N Wagner , C H Wang , M Z Wang , Pan Wang , Y Watanabe , Hidefumi Yamamoto , Y Yamashita , S Yashchenko , Y Yook , C C Zhang , Z P Zhang , V Zhilich , A Zupanc Physical review letters（2014）
摘要
We observe D-0-(D) over bar (0) mixing in the decay D-0 -> K+ pi(-) using a data sample of integrated luminosity 976 fb(-1) collected with the Belle detector at the KEKB e(+) e(-) asymmetric-energy collider. We measure the mixing parameters x'(2) = (0.09 +/- 0.22) x 10(-3) and y' = (4.6 +/- 3.4) x 10(-3) and the ratio of doubly Cabibbo-suppressed to Cabibbo-favored decay rates R-D = (3.53 +/- 0.13) x 10(-3) where the uncertainties are statistical and systematic combined. Our measurement excludes the no-mixing hypothesis at the 5.1 standard deviation level.
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