Observation of the Decay B_{s}^{0}→K^{0}K[over ¯]^{0}. Pal B , Schwartz A J , Abdesselam A , Adachi I , Aihara H , Asner D M , Aushev T , Ayad R , Aziz T , Babu V , Badhrees I , Bahinipati S , Bakich A M , Barberio E , Behera P , Bhardwaj V , Bhuyan B , Biswal J , Bobrov A , Bozek A , Bračko M , Browder T E , Červenkov D , Chekelian V , Chen A , Cheon B G , Chistov R , Cho K , Chobanova V , Choi Y , Cinabro D , Dalseno J , Dash N , Doležal Z , Drásal Z , Drutskoy A , Dutta D , Eidelman S , Farhat H , Fast J E , Fulsom B G , Gaur V , Garmash A , Gillard R , Goh Y M , Goldenzweig P , Greenwald D , Grzymkowska O , Haba J , Hara T , Hayasaka K , Hayashii H , He X H , Hou W-S , Inami K , Ishikawa A , Iwasaki Y , Jacobs W W , Jaegle I , Jeon H B , Joffe D , Joo K K , Julius T , Kang K H , Kato E , Kawasaki T , Kiesling C , Kim D Y , Kim H J , Kim K T , Kim M J , Kim S H , Kinoshita K , Kodyš P , Korpar S , Križan P , Krokovny P , Kuhr T , Kumar R , Kumita T , Kuzmin A , Kwon Y-J , Lee I S , Li C H , Li H , Li L , Li Gioi L , Libby J , Liventsev D , Lukin P , Luo T , Masuda M , Matvienko D , Miyabayashi K , Miyata H , Mizuk R , Mohanty G B , Mohanty S , Moll A , Moon H K , Mori T , Mussa R , Nakano E , Nakao M , Nanut T , Natkaniec Z , Nayak M , Nisar N K , Nishida S , Ogawa S , Okuno S , Pakhlov P , Pakhlova G , Park C W , Park H , Paul S , Pedlar T K , Pesántez L , Pestotnik R , Petrič M , Piilonen L E , Pulvermacher C , Rauch J , Ribežl E , Ritter M , Rostomyan A , Ryu S , Sahoo H , Sakai Y , Sandilya S , Sanuki T , Sato Y , Savinov V , Schlüter T , Schneider O , Schnell G , Schwanda C , Seino Y , Senyo K , Seon O , Seong I S , Shebalin V , Shibata T-A , Shiu J-G , Shwartz B , Simon F , Sohn Y-S , Sokolov A , Solovieva E , Stanič S , Starič M , Stypula J , Sumihama M , Sumiyoshi T , Tamponi U , Teramoto Y , Trabelsi K , Uchida M , Uehara S , Uglov T , Uno S , Urquijo P , Usov Y , Van Hulse C , Vanhoefer P , Varner G , Vinokurova A , Vossen A , Wagner M N , Wang C H , Wang M-Z , Wang X L , Watanabe M , Watanabe Y , Williams K M , Won E , Yamaoka J , Yelton J , Yuan C Z , Yusa Y , Zhang Z P , Zhilich V , Zhulanov V , Zupanc A , Null Null PHYSICAL REVIEW LETTERS（2016）
摘要
We measure the decay B-s(0) -> K-0(K) over bar (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 fb(-1). We measure a branching fraction beta(B-s(0) -> K-0(K) over bar (0)) = [19.6(-5.1)(+5.8)(stat) +/- 1.0(syst) +/- 2.0(N-Bs0 (B) over bar s0)] x 10(-6) with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.
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