Observation of the Decay B_{s}^{0}→K^{0}K[over ¯]^{0}

B Pal; A J Schwartz; A Abdesselam; I Adachi; H Aihara; D M Asner; T Aushev; R Ayad; T Aziz; V Babu; I Badhrees; S Bahinipati; A M Bakich; E Barberio; P Behera; V Bhardwaj; B Bhuyan; J Biswal; A Bobrov; A Bozek; M Bračko; T E Browder; D Červenkov; V Chekelian; A Chen; B G Cheon; R Chistov; K Cho; V Chobanova; Y Choi; D Cinabro; J Dalseno; N Dash; Z Doležal; Z Drásal; A Drutskoy; D Dutta; S Eidelman; H Farhat; J E Fast; B G Fulsom; V Gaur; A Garmash; R Gillard; Y M Goh; P Goldenzweig; D Greenwald; O Grzymkowska; J Haba; T Hara; K Hayasaka; H Hayashii; X H He; W-S Hou; K Inami; A Ishikawa; Y Iwasaki; W W Jacobs; I Jaegle; H B Jeon; D Joffe; K K Joo; T Julius; K H Kang; E Kato; T Kawasaki; C Kiesling; D Y Kim; H J Kim; K T Kim; M J Kim; S H Kim; K Kinoshita; P Kodyš; S Korpar; P Križan; P Krokovny; T Kuhr; R Kumar; T Kumita; A Kuzmin; Y-J Kwon; I S Lee; C H Li; H Li; L Li; L Li Gioi; J Libby; D Liventsev; P Lukin; T Luo; M Masuda; D Matvienko; K Miyabayashi; H Miyata; R Mizuk; G B Mohanty; S Mohanty; A Moll; H K Moon; T Mori; R Mussa; E Nakano; M Nakao; T Nanut; Z Natkaniec; M Nayak; N K Nisar; S Nishida; S Ogawa; S Okuno; P Pakhlov; G Pakhlova; C W Park; H Park; S Paul; T K Pedlar; L Pesántez; R Pestotnik; M Petrič; L E Piilonen; C Pulvermacher; J Rauch; E Ribežl; M Ritter; A Rostomyan; S Ryu; H Sahoo; Y Sakai; S Sandilya; T Sanuki; Y Sato; V Savinov; T Schlüter; O Schneider; G Schnell; C Schwanda; Y Seino; K Senyo; O Seon; I S Seong; V Shebalin; T-A Shibata; J-G Shiu; B Shwartz; F Simon; Y-S Sohn; A Sokolov; E Solovieva; S Stanič; M Starič; J Stypula; M Sumihama; T Sumiyoshi; U Tamponi; Y Teramoto; K Trabelsi; M Uchida; S Uehara; T Uglov; S Uno; P Urquijo; Y Usov; C Van Hulse; P Vanhoefer; G Varner; A Vinokurova; A Vossen; M N Wagner; C H Wang; M-Z Wang; X L Wang; M Watanabe; Y Watanabe; K M Williams; E Won; J Yamaoka; J Yelton; C Z Yuan; Y Yusa; Z P Zhang; V Zhilich; V Zhulanov; A Zupanc; Belle Collaboration

doi:10.1103/PhysRevLett.116.161801

Observation of the Decay B_{s}^{0}→K^{0}K[over ¯]^{0}

Phys Rev Lett. 2016 Apr 22;116(16):161801. doi: 10.1103/PhysRevLett.116.161801. Epub 2016 Apr 19.

Authors

B Pal¹, A J Schwartz¹, A Abdesselam², I Adachi^{3

4}, H Aihara⁵, D M Asner⁶, T Aushev^{7

8}, R Ayad², T Aziz⁹, V Babu⁹, I Badhrees^{10

2}, S Bahinipati¹¹, A M Bakich¹², E Barberio¹³, P Behera¹⁴, V Bhardwaj¹⁵, B Bhuyan¹⁶, J Biswal¹⁷, A Bobrov^{18

19}, A Bozek²⁰, M Bračko^{17

21}, T E Browder²², D Červenkov²³, V Chekelian²⁴, A Chen²⁵, B G Cheon²⁶, R Chistov⁷, K Cho²⁷, V Chobanova²⁴, Y Choi²⁸, D Cinabro²⁹, J Dalseno^{24

30}, N Dash¹¹, Z Doležal²³, Z Drásal²³, A Drutskoy^{7

31}, D Dutta⁹, S Eidelman^{18

19}, H Farhat²⁹, J E Fast⁶, B G Fulsom⁶, V Gaur⁹, A Garmash^{18

19}, R Gillard²⁹, Y M Goh²⁶, P Goldenzweig³², D Greenwald³³, O Grzymkowska²⁰, J Haba^{3

4}, T Hara^{3

4}, K Hayasaka³⁴, H Hayashii³⁵, X H He³⁶, W-S Hou³⁷, K Inami³⁸, A Ishikawa³⁹, Y Iwasaki⁴, W W Jacobs⁴⁰, I Jaegle²², H B Jeon⁴¹, D Joffe⁴², K K Joo⁴³, T Julius¹³, K H Kang⁴¹, E Kato³⁹, T Kawasaki⁴⁴, C Kiesling²⁴, D Y Kim⁴⁵, H J Kim⁴¹, K T Kim⁴⁶, M J Kim⁴¹, S H Kim²⁶, K Kinoshita¹, P Kodyš²³, S Korpar^{17

21}, P Križan^{17

47}, P Krokovny^{18

19}, T Kuhr⁴⁸, R Kumar⁴⁹, T Kumita⁵⁰, A Kuzmin^{18

19}, Y-J Kwon⁵¹, I S Lee²⁶, C H Li¹³, H Li⁴⁰, L Li⁵², L Li Gioi²⁴, J Libby¹⁴, D Liventsev^{4

53}, P Lukin^{18

19}, T Luo⁵⁴, M Masuda⁵⁵, D Matvienko^{18

19}, K Miyabayashi³⁵, H Miyata⁴⁴, R Mizuk^{7

31}, G B Mohanty⁹, S Mohanty^{9

56}, A Moll^{24

30}, H K Moon⁴⁶, T Mori³⁸, R Mussa⁵⁷, E Nakano⁵⁸, M Nakao^{3

4}, T Nanut¹⁷, Z Natkaniec²⁰, M Nayak¹⁴, N K Nisar^{59

9}, S Nishida^{3

4}, S Ogawa⁶⁰, S Okuno⁶¹, P Pakhlov^{7

31}, G Pakhlova^{7

8}, C W Park²⁸, H Park⁴¹, S Paul³³, T K Pedlar⁶², L Pesántez⁶³, R Pestotnik¹⁷, M Petrič¹⁷, L E Piilonen⁵³, C Pulvermacher³², J Rauch³³, E Ribežl¹⁷, M Ritter⁴⁸, A Rostomyan⁶⁴, S Ryu⁶⁵, H Sahoo²², Y Sakai^{3

4}, S Sandilya⁹, T Sanuki³⁹, Y Sato³⁸, V Savinov⁵⁴, T Schlüter⁴⁸, O Schneider⁶⁶, G Schnell^{67

68}, C Schwanda⁶⁹, Y Seino⁴⁴, K Senyo⁷⁰, O Seon³⁸, I S Seong²², V Shebalin^{18

19}, T-A Shibata⁷¹, J-G Shiu³⁷, B Shwartz^{18

19}, F Simon^{24

30}, Y-S Sohn⁵¹, A Sokolov⁷², E Solovieva⁷, S Stanič⁷³, M Starič¹⁷, J Stypula²⁰, M Sumihama⁷⁴, T Sumiyoshi⁵⁰, U Tamponi^{57

75}, Y Teramoto⁵⁸, K Trabelsi^{3

4}, M Uchida⁷¹, S Uehara^{3

4}, T Uglov^{7

8}, S Uno^{3

4}, P Urquijo¹³, Y Usov^{18

19}, C Van Hulse⁶⁷, P Vanhoefer²⁴, G Varner²², A Vinokurova^{18

19}, A Vossen⁴⁰, M N Wagner⁷⁶, C H Wang⁷⁷, M-Z Wang³⁷, X L Wang⁵³, M Watanabe⁴⁴, Y Watanabe⁶¹, K M Williams⁵³, E Won⁴⁶, J Yamaoka⁶, J Yelton⁷⁸, C Z Yuan⁷⁹, Y Yusa⁴⁴, Z P Zhang⁵², V Zhilich^{18

19}, V Zhulanov^{18

19}, A Zupanc^{17

47}; Belle Collaboration

Affiliations

¹ University of Cincinnati, Cincinnati, Ohio 45221.
² Department of Physics, Faculty of Science, University of Tabuk, Tabuk 71451.
³ SOKENDAI (The Graduate University for Advanced Studies), Hayama 240-0193.
⁴ High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801.
⁵ Department of Physics, University of Tokyo, Tokyo 113-0033.
⁶ Pacific Northwest National Laboratory, Richland, Washington 99352.
⁷ Institute for Theoretical and Experimental Physics, Moscow 117218.
⁸ Moscow Institute of Physics and Technology, Moscow Region 141700.
⁹ Tata Institute of Fundamental Research, Mumbai 400005.
¹⁰ King Abdulaziz City for Science and Technology, Riyadh 11442.
¹¹ Indian Institute of Technology Bhubaneswar, Satya Nagar 751007.
¹² School of Physics, University of Sydney, New South Wales 2006.
¹³ School of Physics, University of Melbourne, Victoria 3010.
¹⁴ Indian Institute of Technology Madras, Chennai 600036.
¹⁵ University of South Carolina, Columbia, South Carolina 29208.
¹⁶ Indian Institute of Technology Guwahati, Assam 781039.
¹⁷ J. Stefan Institute, 1000 Ljubljana.
¹⁸ Budker Institute of Nuclear Physics SB RAS, Novosibirsk 630090.
¹⁹ Novosibirsk State University, Novosibirsk 630090.
²⁰ H. Niewodniczanski Institute of Nuclear Physics, Krakow 31-342.
²¹ University of Maribor, 2000 Maribor.
²² University of Hawaii, Honolulu, Hawaii 96822.
²³ Faculty of Mathematics and Physics, Charles University, 12116 Prague.
²⁴ Max-Planck-Institut für Physik, 80805 München.
²⁵ National Central University, Chung-li 32054.
²⁶ Hanyang University, Seoul 133-791.
²⁷ Korea Institute of Science and Technology Information, Daejeon 305-806.
²⁸ Sungkyunkwan University, Suwon 440-746.
²⁹ Wayne State University, Detroit, Michigan 48202.
³⁰ Excellence Cluster Universe, Technische Universität München, 85748 Garching.
³¹ Moscow Physical Engineering Institute, Moscow 115409.
³² Institut für Experimentelle Kernphysik, Karlsruher Institut für Technologie, 76131 Karlsruhe.
³³ Department of Physics, Technische Universität München, 85748 Garching.
³⁴ Kobayashi-Maskawa Institute, Nagoya University, Nagoya 464-8602.
³⁵ Nara Women's University, Nara 630-8506.
³⁶ Peking University, Beijing 100871.
³⁷ Department of Physics, National Taiwan University, Taipei 10617.
³⁸ Graduate School of Science, Nagoya University, Nagoya 464-8602.
³⁹ Department of Physics, Tohoku University, Sendai 980-8578.
⁴⁰ Indiana University, Bloomington, Indiana 47408.
⁴¹ Kyungpook National University, Daegu 702-701.
⁴² Kennesaw State University, Kennesaw, Georgia 30144.
⁴³ Chonnam National University, Kwangju 660-701.
⁴⁴ Niigata University, Niigata 950-2181.
⁴⁵ Soongsil University, Seoul 156-743.
⁴⁶ Korea University, Seoul 136-713.
⁴⁷ Faculty of Mathematics and Physics, University of Ljubljana, 1000 Ljubljana.
⁴⁸ Ludwig Maximilians University, 80539 Munich.
⁴⁹ Punjab Agricultural University, Ludhiana 141004.
⁵⁰ Tokyo Metropolitan University, Tokyo 192-0397.
⁵¹ Yonsei University, Seoul 120-749.
⁵² University of Science and Technology of China, Hefei 230026.
⁵³ CNP, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061.
⁵⁴ University of Pittsburgh, Pittsburgh, Pennsylvania 15260.
⁵⁵ Earthquake Research Institute, University of Tokyo, Tokyo 113-0032.
⁵⁶ Utkal University, Bhubaneswar 751004.
⁵⁷ INFN-Sezione di Torino, 10125 Torino.
⁵⁸ Osaka City University, Osaka 558-8585.
⁵⁹ Aligarh Muslim University, Aligarh 202002.
⁶⁰ Toho University, Funabashi 274-8510.
⁶¹ Kanagawa University, Yokohama 221-8686.
⁶² Luther College, Decorah, Iowa 52101.
⁶³ University of Bonn, 53115 Bonn.
⁶⁴ Deutsches Elektronen-Synchrotron, 22607 Hamburg.
⁶⁵ Seoul National University, Seoul 151-742.
⁶⁶ École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015.
⁶⁷ University of the Basque Country UPV/EHU, 48080 Bilbao.
⁶⁸ IKERBASQUE, Basque Foundation for Science, 48013 Bilbao.
⁶⁹ Institute of High Energy Physics, Vienna 1050.
⁷⁰ Yamagata University, Yamagata 990-8560.
⁷¹ Tokyo Institute of Technology, Tokyo 152-8550.
⁷² Institute for High Energy Physics, Protvino 142281.
⁷³ University of Nova Gorica, 5000 Nova Gorica.
⁷⁴ Gifu University, Gifu 501-1193.
⁷⁵ University of Torino, 10124 Torino.
⁷⁶ Justus-Liebig-Universität Gießen, 35392 Gießen.
⁷⁷ National United University, Miao Li 36003.
⁷⁸ University of Florida, Gainesville, Florida 32611.
⁷⁹ Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049.

PMID: 27152790
DOI: 10.1103/PhysRevLett.116.161801

Abstract

We measure the decay B_{s}^{0}→K^{0}K[over ¯]^{0} using data collected at the ϒ(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 B(B_{s}^{0}→K^{0}K[over ¯]^{0})=[19.6_{-5.1}^{+5.8}(stat)±1.0(syst)±2.0(N_{B_{s}^{0}B[over ¯]_{s}^{0}})]×10^{-6} with a significance of 5.1 standard deviations. This measurement constitutes the first observation of this decay.