Observation of the decay $B_s^0\rightarrow K^0\overline{K}^0$ B K Pal , P K Behera , D Liventsev , V Chekelian , Masao Masuda , V Babu , Shigeki Uehara , K Hayasaka , P Lukin , T Uglov , E Won , D Dutta , M J Kim , Y Choi , T Mori , X H He , Kwan Hyoung Kang , B G Cheon , P Kodys , Hyangkyu Park , O Grzymkowska , T Sumiyoshi , W S Hou , Heung Bae Jeon , A J Schwartz , A Bobrov , G B Mohanty , K Cho , A M Bakich , Y Teramoto , B Shwartz , M Staric , A Ishikawa , M Z Wang , T E Browder , A Bozek , J Biswal , Dong Yong Kim , J Libby , Yutaka Watanabe , K Inami , M Sumihama , P Vanhoefer , R Pestotnik , C H Wang , H Hayashii , L E Piilonen , C Z Yuan , Yoshihiro Sakai , J Haba , S Korpar , B G Fulsom , M Petric , S Ogawa , H J Kim , A Kuzmin , T Julius , T Aushev , A Rostomyan , T Schluter , Y M Goh , R Mizuk , E Solovieva , M Bracko , G Varner , M N Wagner , P Krizan , O Schneider , Honghui Li , H Farhat , Z Natkaniec , A Moll , K Kinoshita , Steven M Paul , S Uno , K M Williams , D Greenwald , D Matvienko , I Adachi , T Aziz , O Seon , Ravi Kumar , J Yamaoka , V Bhardwaj , Y S Sohn , V Gaur , T Kumita , T K Pedlar , R Chistov , D M Asner , M Watanabe , Ting Luo , E Barberio , U Tamponi , H Sahoo , M Nayak , H K Moon , R Gillard , K T Kim , S Eidelman , I Jaegle , A Abdesselam , V Zhulanov , R Mussa , R Ayad , M Nakao , C Schwanda , H Aihara , P Goldenzweig , S H Kim , T Sanuki , V Zhilich , K Senyo , Yoshihiko Seino , A Vinokurova , Argon Chen , Tomomi Kawasaki , S Okuno , T A Shibata , V Chobanova , Toshiro Hara , N K Nisar , J Dalseno , A Drutskoy , P Krokovny , P Pakhlov , J Stypula , Jennifer N Rauch , S Mohanty , Yasuo Sato , D Cervenkov , L Pesantez , Chan Woo Park , F Simon , N Dash , Z Drasal , C H Li , V Shebalin , Z P Zhang , M Ritter , S Ryu , Ihn Sik Seong , H Miyata , A Vossen , C Van Hulse , C Pulvermacher , T Kuhr , K Miyabayashi , B K Bhuyan , S Bahinipati , Y Yusa , Z Dolezal , S Stanic , X L Wang , J G Shiu , Y Iwasaki , G Schnell , A Sokolov , K Trabelsi , I Badhrees , W W Jacobs , E Ribezl , V Savinov , P Urquijo , L Li , A Zupanc , C Kiesling , J Fast , E Kato , D Joffe , D Cinabro , E Nakano , G Pakhlova , S Nishida , S Sandilya , T Nanut , I S Lee , K K Joo , A Garmash , Y J Kwon , L Li Gioi , J Yelton , Y Usov , Masayuki Uchida mag（2015）
摘要
We measure the decay $B_s^0rightarrow K^0overline{K}^0$ using data collected at the $Upsilon(5S)$ resonance with the Belle detector at the KEKB $e^+e^-$ collider. The data sample used corresponds to an integrated luminosity of 121.4 ${rm fb^{-1}}$. We measure a branching fraction $mathcal{B}(B_s^0rightarrow K^0overline{K}^0) = [19.6,^{+5.8}_{-5.1}({rm stat.}),pm1.0({rm sys.}),pm 2.0(N^{}_{B_s^0overline{B}_s^0})]times 10^{-6}$ with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
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