Measurement of CP asymmetries in B^0 → K^0_S K^0_S K^0_S decays at Belle II

Belle II Collaboration,I. Adachi,L. Aggarwal,H. Ahmed,H. Aihara,N. Akopov,A. Aloisio,N. Anh Ky,D. M. Asner, H. Atmacan,T. Aushev,V. Aushev,M. Aversano,R. Ayad,V. Babu,H. Bae,S. Bahinipati,P. Bambade,Sw. Banerjee,S. Bansal,M. Barrett,J. Baudot,M. Bauer, A. Baur, A. Beaubien,F. Becherer,J. Becker,P. K. Behera,J. V. Bennett,F. U. Bernlochner,V. Bertacchi,M. Bertemes,E. Bertholet,M. Bessner,S. Bettarini,B. Bhuyan,F. Bianchi,L. Bierwirth,T. Bilka,D. Biswas,A. Bobrov,D. Bodrov,A. Bolz,A. Bondar,J. Borah,A. Bozek,M. Bračko,P. Branchini,R. A. Briere,T. E. Browder, A. Budano,S. Bussino,M. Campajola,L. Cao,G. Casarosa,C. Cecchi,J. Cerasoli,M. -C. Chang,P. Chang,R. Cheaib,P. Cheema,V. Chekelian,C. Chen,B. G. Cheon,K. Chilikin,K. Chirapatpimol, H. -E. Cho,K. Cho,S. -J. Cho,S. -K. Choi, S. Choudhury,J. Cochran,L. Corona,L. M. Cremaldi,S. Das,F. Dattola,E. De La Cruz-Burelo,S. A. De La Motte,G. De Nardo,M. De Nuccio,G. De Pietro,R. de Sangro, M. Destefanis,S. Dey,A. De Yta-Hernandez,R. Dhamija,A. Di Canto,F. Di Capua,J. Dingfelder,Z. Doležal,I. Domínguez Jiménez,T. V. Dong,M. Dorigo,K. Dort,D. Dossett, S. Dreyer,S. Dubey,G. Dujany,P. Ecker,M. Eliachevitch,D. Epifanov,P. Feichtinger,T. Ferber,D. Ferlewicz,T. Fillinger,C. Finck,G. Finocchiaro,A. Fodor,F. Forti,A. Frey,B. G. Fulsom,A. Gabrielli,E. Ganiev,M. Garcia-Hernandez,R. Garg,A. Garmash,G. Gaudino,V. Gaur,A. Gaz,A. Gellrich,G. Ghevondyan,D. Ghosh,H. Ghumaryan,G. Giakoustidis,R. Giordano,A. Giri,A. Glazov,B. Gobbo,R. Godang,O. Gogota,P. Goldenzweig,W. Gradl,T. Grammatico,S. Granderath,E. Graziani,D. Greenwald,Z. Gruberová,T. Gu,Y. Guan,K. Gudkova,S. Halder,Y. Han, K. Hara,T. Hara, K. Hayasaka,H. Hayashii,S. Hazra,C. Hearty,M. T. Hedges,A. Heidelbach,I. Heredia de la Cruz,M. Hernández Villanueva,A. Hershenhorn,T. Higuchi,E. C. Hill,M. Hoek,M. Hohmann,P. Horak,C. -L. Hsu,T. Humair,T. Iijima,K. Inami,N. Ipsita,A. Ishikawa,S. Ito,R. Itoh,M. Iwasaki,P. Jackson,W. W. Jacobs,D. E. Jaffe,E. -J. Jang,Q. P. Ji,S. Jia,Y. Jin,A. Johnson, K. K. Joo,H. Junkerkalefeld,H. Kakuno,M. Kaleta,D. Kalita,A. B. Kaliyar,J. Kandra, K. H. Kang,S. Kang,G. Karyan, T. Kawasaki,F. Keil,C. Ketter, C. Kiesling,C. -H. Kim, D. Y. Kim, K. -H. Kim,Y. -K. Kim,H. Kindo,K. Kinoshita, P. Kodyš,T. Koga,S. Kohani,K. Kojima,T. Konno,A. Korobov, S. Korpar,E. Kovalenko,R. Kowalewski,T. M. G. Kraetzschmar, P. Križan,P. Krokovny,Y. Kulii, T. Kuhr,J. Kumar,M. Kumar, R. Kumar,K. Kumara,T. Kunigo,A. Kuzmin,Y. -J. Kwon,S. Lacaprara,Y. -T. Lai,T. Lam,L. Lanceri,J. S. Lange,M. Laurenza,K. Lautenbach,R. Leboucher,F. R. Le Diberder,P. Leitl,D. Levit,C. Li,L. K. Li,Y. Li,J. Libby, Q. Y. Liu, Z. Q. Liu,D. Liventsev,S. Longo,A. Lozar,T. Lueck,C. Lyu,Y. Ma,M. Maggiora,S. P. Maharana,R. Maiti,S. Maity,G. Mancinelli,R. Manfredi,E. Manoni,M. Mantovano,D. Marcantonio,S. Marcello,C. Marinas,L. Martel,C. Martellini,A. Martini,T. Martinov,L. Massaccesi,M. Masuda, T. Matsuda,D. Matvienko,S. K. Maurya,J. A. McKenna,R. Mehta,F. Meier,M. Merola,F. Metzner,M. 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J. Schwartz,Y. Seino,A. Selce,K. Senyo,J. Serrano,M. E. Sevior,C. Sfienti,W. Shan,C. Sharma, X. D. Shi,T. Shillington,T. Shimasaki,J. -G. Shiu,D. Shtol,B. Shwartz, A. Sibidanov,F. Simon,J. B. Singh,J. Skorupa,R. J. Sobie,M. Sobotzik,A. Soffer,A. Sokolov, E. Solovieva,S. Spataro,B. Spruck,M. Starič,P. Stavroulakis,S. Stefkova,Z. S. Stottler,R. Stroili,J. Strube,Y. Sue,M. Sumihama, K. Sumisawa,W. Sutcliffe,H. Svidras,M. Takahashi,M. Takizawa,U. Tamponi, K. Tanida,H. Tanigawa, F. Tenchini,A. Thaller,O. Tittel,R. Tiwary,D. Tonelli,E. Torassa,N. Toutounji,K. Trabelsi,I. Tsaklidis,M. Uchida,I. Ueda,Y. Uematsu,T. Uglov,K. Unger,Y. Unno,K. Uno,S. Uno,P. Urquijo,Y. Ushiroda,S. E. Vahsen,R. van Tonder,G. S. Varner,K. E. Varvell,M. Veronesi,V. S. Vismaya,L. Vitale,V. Vobbilisetti,R. Volpe,B. Wach,M. Wakai,S. Wallner,E. Wang,M. -Z. Wang,X. L. Wang,Z. Wang,A. Warburton,M. Watanabe,S. Watanuki,M. Welsch,C. Wessel,X. P. Xu,B. D. Yabsley,S. Yamada,W. Yan,S. B. Yang,J. Yelton,J. H. Yin,K. Yoshihara,C. Z. Yuan,Y. Yusa,L. Zani,Y. Zhang,V. Zhilich,J. S. Zhou,Q. D. Zhou,X. Y. Zhou,V. I. Zhukova

arxiv（2024）

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摘要

We report a measurement of decay-time dependent charge-parity (CP) asymmetries in B^0 → K^0_S K^0_S K^0_S decays. We use 387 × 10^6 BB̅ pairs collected at the Υ(4S) resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the CP-violating parameters S and C from a fit to the distribution of the decay-time difference between the two B mesons. The resulting confidence region is consistent with previous measurements in B^0 → K^0_S K^0_S K^0_S and B^0 → (cc̅)K^0 decays, and with predictions based on the standard model.

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