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. 2023 Sep 15;131(11):111803.
doi: 10.1103/PhysRevLett.131.111803.

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

I AdachiK AdamczykL AggarwalH AhmedH AiharaN AkopovA AloisioN Anh KyD M AsnerH AtmacanT AushevV AushevM AversanoV BabuH BaeS BahinipatiP BambadeSw BanerjeeM BarrettJ BaudotM BauerA BaurA BeaubienJ BeckerP K BeheraJ V BennettV BertacchiM BertemesE BertholetM BessnerS BettariniB BhuyanF BianchiT BilkaD BiswasD BodrovA BondarJ BorahA BozekM BračkoP BranchiniR A BriereT E BrowderA BudanoS BussinoM CampajolaL CaoG CasarosaC CecchiJ CerasoliP ChangR CheaibP CheemaV ChekelianC ChenB G CheonK ChilikinK ChirapatpimolH-E ChoK ChoS-J ChoS-K ChoiS ChoudhuryJ CochranL CoronaL M CremaldiS DasF DattolaE De La Cruz-BureloS A De La MotteG de MarinoM De NuccioG De PietroR de SangroM DestefanisA De Yta-HernandezR DhamijaA Di CantoF Di CapuaJ DingfelderZ DoležalI Domínguez JiménezT V DongM DorigoK DortS DreyerS DubeyG DujanyP EckerM EliachevitchP FeichtingerT FerberD FerlewiczT FillingerC FinckG FinocchiaroA FodorF FortiB G FulsomA GabrielliE GanievM Garcia-HernandezR GargA GarmashG GaudinoV GaurA GazA GellrichD GhoshG GiakoustidisR GiordanoA GiriA GlazovB GobboR GodangP GoldenzweigW GradlT GrammaticoS GranderathE GrazianiD GreenwaldZ GruberováT GuY GuanK GudkovaS HalderY HanK HaraT HaraK HayasakaH HayashiiS HazraC HeartyM T HedgesI Heredia de la CruzM Hernández VillanuevaA HershenhornT HiguchiE C HillM HoekM HohmannC-L HsuT HumairT IijimaK InamiN IpsitaA IshikawaS ItoR ItohM IwasakiP JacksonW W JacobsE-J JangQ P JiS JiaY JinA JohnsonK K JooH JunkerkalefeldM KaletaA B KaliyarJ KandraK H KangS KangS KarG KaryanT KawasakiF KeilC KetterC KieslingC-H KimD Y KimK-H KimY-K KimH KindoP KodyšT KogaS KohaniK KojimaA KorobovS KorparE KovalenkoR KowalewskiT M G KraetzschmarP KrižanP KrokovnyT KuhrJ KumarM KumarK KumaraT KunigoA KuzminY-J KwonS LacapraraY-T LaiT LamJ S LangeM LaurenzaR LeboucherF R Le DiberderP LeitlD LevitC LiL K LiJ LibbyQ Y LiuZ Q LiuD LiventsevS LongoT LueckT LuoC LyuY MaM MaggioraS P MaharanaR MaitiS MaityG MancinelliR ManfrediE ManoniM MantovanoD MarcantonioS MarcelloC MarinasL MartelC MartelliniT MartinovL MassaccesiM MasudaT MatsudaK MatsuokaD MatvienkoS K MauryaJ A McKennaR MehtaF MeierM MerolaF MetznerM MilesiC MillerM MirraK MiyabayashiR MizukG B MohantyN Molina-GonzalezS MondalS MonetaH-G MoserM MrvarR MussaI NakamuraY NakazawaA Narimani CharanM NarukiA NatochiiL NayakM NayakG NazaryanN K NisarS NishidaH OnoY OnukiP OskinP PakhlovG PakhlovaA PaladinoE PaoloniS PardiK ParhamH ParkS-H ParkA PasseriS PatraS PaulT K PedlarR PeschkeR PestotnikF PhamM PiccoloL E PiilonenP L M Podesta-LermaT PodobnikS PokharelC PrazS PrellE PrencipeM T PrimH PurwarN RadP RadosG RaeuberS RaizM ReifS ReiterM RemnevI Ripp-BaudotG RizzoS H RobertsonM RoehrkenJ M RoneyA RostomyanN RoutG RussoD SahooS SandilyaA SangalL SanteljY SatoV SavinovB ScavinoC SchmittC SchwandaA J SchwartzY SeinoA SelceK SenyoJ SerranoM E SeviorC SfientiW ShanC SharmaX D ShiT ShillingtonJ-G ShiuD ShtolA SibidanovF SimonJ B SinghJ SkorupaR J SobieM SobotzikA SofferA SokolovE SolovievaS SpataroB SpruckM StaričP StavroulakisS StefkovaZ S StottlerR StroiliM SumihamaK SumisawaW SutcliffeH SvidrasM TakahashiM TakizawaU TamponiS TanakaK TanidaF TenchiniA ThallerO TittelR TiwaryD TonelliE TorassaK TrabelsiI TsaklidisM UchidaI UedaT UglovK UngerY UnnoK UnoS UnoP UrquijoY UshirodaS E VahsenR van TonderG S VarnerK E VarvellA VinokurovaV S VismayaL VitaleB WachM WakaiH M WakelingS WallnerE WangM-Z WangZ WangA WarburtonM WatanabeS WatanukiM WelschC WesselE WonX P XuB D YabsleyS YamadaW YanS B YangJ H YinK YoshiharaC Z YuanY YusaL ZaniY ZhangV ZhilichQ D ZhouV I ZhukovaBelle II Collaboration

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

I Adachi et al. Phys Rev Lett. .

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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