Measurement of CP Violation in B^{0}→K_{S}^{0}π^{0} Decays at Belle II.

I Adachi,K Adamczyk,L Aggarwal,H Ahmed,H Aihara,N Akopov,A Aloisio,N Anh Ky,D M Asner,H Atmacan,T Aushev,V Aushev,M Aversano,V Babu,H Bae,S Bahinipati,P Bambade,Sw Banerjee,M Barrett,J Baudot,M Bauer,A Baur,A Beaubien,J Becker,P K Behera,J V Bennett,V Bertacchi,M Bertemes,E Bertholet,M Bessner,S Bettarini,B Bhuyan,F Bianchi,T Bilka,D Biswas,D Bodrov,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,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 Marino,M De Nuccio,G De Pietro,R de Sangro,M Destefanis,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,S Dreyer,S Dubey,G Dujany,P Ecker,M Eliachevitch,P Feichtinger,T Ferber,D Ferlewicz,T Fillinger,C Finck,G Finocchiaro,A Fodor,F Forti,B G Fulsom,A Gabrielli,E Ganiev,M Garcia-Hernandez,R Garg,A Garmash,G Gaudino,V Gaur,A Gaz,A Gellrich,D Ghosh,G Giakoustidis,R Giordano,A Giri,A Glazov,B Gobbo,R Godang,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,I Heredia de la Cruz,M Hernández Villanueva,A Hershenhorn,T Higuchi,E C Hill,M Hoek,M Hohmann,C-L Hsu,T Humair,T Iijima,K Inami,N Ipsita,A Ishikawa,S Ito,R Itoh,M Iwasaki,P Jackson,W W Jacobs,E-J Jang,Q P Ji,S Jia,Y Jin,A Johnson,K K Joo,H Junkerkalefeld,M Kaleta,A B Kaliyar,J Kandra,K H Kang,S Kang, S Kar,G Karyan,T Kawasaki,F Keil,C Ketter,C Kiesling,C-H Kim,D Y Kim,K-H Kim,Y-K Kim,H Kindo,P Kodyš,T Koga,S Kohani,K Kojima,A Korobov,S Korpar,E Kovalenko,R Kowalewski,T M G Kraetzschmar,P Križan,P Krokovny,T Kuhr,J Kumar,M Kumar,K Kumara,T Kunigo,A Kuzmin,Y-J Kwon,S Lacaprara,Y-T Lai,T Lam,J S Lange,M Laurenza,R Leboucher,F R Le Diberder,P Leitl,D Levit,C Li,L K Li,J Libby, Q Y Liu,Z Q Liu,D Liventsev,S Longo,T Lueck,T Luo,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,T Martinov,L Massaccesi,M Masuda,T Matsuda,K Matsuoka,D Matvienko,S K Maurya,J A McKenna,R Mehta,F Meier,M Merola,F Metzner,M Milesi,C Miller,M Mirra,K Miyabayashi,R Mizuk,G B Mohanty,N Molina-Gonzalez,S Mondal,S Moneta,H-G Moser,M Mrvar,R Mussa,I Nakamura,Y Nakazawa,A Narimani Charan,M Naruki,A Natochii,L Nayak,M Nayak,G Nazaryan,N K Nisar,S Nishida,H Ono,Y Onuki,P Oskin,P Pakhlov,G Pakhlova,A Paladino,E Paoloni,S Pardi,K Parham,H Park,S-H Park,A Passeri,S Patra,S Paul,T K Pedlar,R Peschke,R Pestotnik,F Pham,M Piccolo,L E Piilonen,P L M Podesta-Lerma,T Podobnik,S Pokharel,C Praz,S Prell,E Prencipe,M T Prim,H Purwar,N Rad,P Rados,G Raeuber,S Raiz,M Reif,S Reiter,M Remnev,I Ripp-Baudot,G Rizzo,S H Robertson,M Roehrken,J M Roney,A Rostomyan,N Rout,G Russo,D Sahoo,S Sandilya,A Sangal,L Santelj,Y Sato,V Savinov,B Scavino,C Schmitt,C Schwanda,A J Schwartz,Y Seino,A Selce,K Senyo,J Serrano,M E Sevior,C Sfienti,W Shan,C Sharma,X D Shi,T Shillington,J-G Shiu,D Shtol,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,M Sumihama,K Sumisawa,W Sutcliffe,H Svidras,M Takahashi,M Takizawa,U Tamponi,S Tanaka,K Tanida,F Tenchini,A Thaller,O Tittel,R Tiwary,D Tonelli,E Torassa,K Trabelsi,I Tsaklidis,M Uchida,I Ueda,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,A Vinokurova,V S Vismaya,L Vitale,B Wach,M Wakai,H M Wakeling,S Wallner,E Wang,M-Z Wang,Z Wang,A Warburton,M Watanabe,S Watanuki,M Welsch,C Wessel,E Won,X P Xu,B D Yabsley,S Yamada,W Yan,S B Yang,J H Yin,K Yoshihara,C Z Yuan,Y Yusa,L Zani,Y Zhang,V Zhilich,Q D Zhou,V I Zhukova

Physical review letters（2023）

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Abstract

We report a measurement of the CP-violating parameters C and S in B^{0}→K_{S}^{0}π^{0} decays at Belle II using a sample of 387×10^{6} BB[over ¯] events recorded in e^{+}e^{-} collisions at a center-of-mass energy corresponding to the ϒ(4S) resonance. These parameters are determined by fitting the proper decay-time distribution of a sample of 415 signal events. We obtain C=-0.04_{-0.15}^{+0.14}±0.05 and S=0.75_{-0.23}^{+0.20}±0.04, where the first uncertainties are statistical and the second are systematic.

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Key words

decays,belle ii,cp violation

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