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. 2025 Jan 10;134(1):011802.
doi: 10.1103/PhysRevLett.134.011802.

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

I AdachiL AggarwalH AhmedH AiharaN AkopovA AloisioN Anh KyD M AsnerH AtmacanT AushevV AushevM AversanoR AyadV BabuH BaeS BahinipatiP BambadeSw BanerjeeS BansalM BarrettJ BaudotA BaurA BeaubienF BechererJ BeckerJ V BennettF U BernlochnerV BertacchiM BertemesE BertholetM BessnerS BettariniB BhuyanF BianchiL BierwirthT BilkaS BilokinD BiswasD BodrovA BolzA BondarJ BorahA BoschettiA BozekM BračkoP BranchiniR A BriereT E BrowderA BudanoS BussinoM CampajolaL CaoG CasarosaC CecchiJ CerasoliM-C ChangP ChangR CheaibP CheemaC ChenB G CheonK ChilikinK ChirapatpimolH-E ChoK ChoS-J ChoS-K ChoiS ChoudhuryJ CochranL CoronaJ X CuiS DasF DattolaE De La Cruz-BureloS A De La MotteG De NardoM De NuccioG De PietroR de SangroM DestefanisS DeyR DhamijaA Di CantoF Di CapuaJ DingfelderZ DoležalI Domínguez JiménezT V DongM DorigoD DornerK DortD DossettS DreyerS DubeyK DugicG DujanyP EckerM EliachevitchP FeichtingerT FerberD FerlewiczT FillingerC FinckG FinocchiaroA FodorF FortiA FreyB G FulsomA GabrielliE GanievM Garcia-HernandezR GargG GaudinoV GaurA GazA GellrichG GhevondyanD GhoshH GhumaryanG GiakoustidisR GiordanoA GiriA GlazovB GobboR GodangO GogotaP GoldenzweigW GradlT GrammaticoE GrazianiD GreenwaldZ GruberováT GuY GuanK GudkovaS HalderY HanK HaraT HaraK HayasakaH HayashiiS HazraC HeartyM T HedgesA HeidelbachI Heredia de la CruzM Hernández VillanuevaT HiguchiM HoekM HohmannP HorakC-L HsuT HumairT IijimaK InamiN IpsitaA IshikawaR ItohM IwasakiP JacksonW W JacobsD E JaffeE-J JangQ P JiS JiaY JinK K JooH JunkerkalefeldM KaletaD KalitaA B KaliyarJ KandraK H KangS KangG KaryanT KawasakiF KeilC KieslingC-H KimD Y KimK-H KimY-K KimH KindoK KinoshitaP KodyšT KogaS KohaniK KojimaA KorobovS KorparE KovalenkoR KowalewskiT M G KraetzschmarP KrižanP KrokovnyT KuhrY KuliiJ KumarM KumarK KumaraT KunigoA KuzminY-J KwonS LacapraraY-T LaiT LamL LanceriJ S LangeM LaurenzaR LeboucherF R Le DiberderM J LeeP LeoD LevitC LiL K LiS X LiY LiY B LiJ LibbyY-R LinM H LiuQ Y LiuZ Q LiuD LiventsevS LongoT LueckT LuoC LyuY MaM MaggioraS P MaharanaR MaitiS MaityG MancinelliR ManfrediE ManoniM MantovanoD MarcantonioS MarcelloC MarinasL MartelC MartelliniA MartiniT MartinovL MassaccesiM MasudaK MatsuokaD MatvienkoS K MauryaJ A McKennaR MehtaF MeierM MerolaF MetznerC MillerM MirraS MitraK MiyabayashiH MiyakeR MizukG B MohantyN Molina-GonzalezS MondalS MonetaH-G MoserM MrvarR MussaI NakamuraK R NakamuraM NakaoH NakazawaY NakazawaA Narimani CharanM NarukiD NarwalZ NatkaniecA NatochiiL NayakM NayakG NazaryanM NeuC NiebuhrS NishidaS OgawaY OnishchukH OnoY OnukiP OskinF OtaniP PakhlovG PakhlovaA PantaS PardiK ParhamH ParkS-H ParkB PaschenA PasseriS PatraS PaulT K PedlarR PeschkeR PestotnikM PiccoloL E PiilonenG Pinna AngioniP L M Podesta-LermaT PodobnikS PokharelC PrazS PrellE PrencipeM T PrimI PrudiievH PurwarP RadosG RaeuberS RaizN RaulsK RavindranM ReifS ReiterM RemnevI Ripp-BaudotG RizzoS H RobertsonM RoehrkenJ M RoneyA RostomyanN RoutG RussoD A SandersS SandilyaA SangalL SanteljY SatoV SavinovB ScavinoC SchmittC SchwandaA J SchwartzM SchwickardiY SeinoA SelceK SenyoJ SerranoM E SeviorC SfientiW ShanX D ShiT ShillingtonT ShimasakiJ-G ShiuD ShtolB ShwartzA SibidanovF SimonJ B SinghJ SkorupaR J SobieM SobotzikA SofferA SokolovE SolovievaS SpataroB SpruckM StaričP StavroulakisS StefkovaR StroiliM SumihamaK SumisawaW SutcliffeH SvidrasM TakahashiM TakizawaU TamponiS TanakaK TanidaF TenchiniA ThallerO TittelR TiwaryD TonelliE TorassaK TrabelsiI TsaklidisM UchidaI UedaY UematsuT UglovK UngerY UnnoK UnoS UnoP UrquijoY UshirodaS E VahsenR van TonderK E VarvellM VeronesiA VinokurovaV S VismayaL VitaleV VobbilisettiR VolpeB WachM WakaiS WallnerE WangM-Z WangX L WangZ WangA WarburtonM WatanabeS WatanukiC WesselE WonY XieX P XuB D YabsleyS YamadaS B YangJ YeltonJ H YinK YoshiharaC Z YuanY YusaL ZaniF ZengB ZhangY ZhangV ZhilichQ D ZhouX Y ZhouV I ZhukovaR ŽlebčíkBelle II Collaboration

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

I Adachi et al. Phys Rev Lett. .

Abstract

We report measurements of time-dependent CP asymmetries in B^{0}→K_{S}^{0}π^{0}γ decays based on a data sample of (388±6)×10^{6} BB[over ¯] events collected at the ϒ(4S) resonance with the Belle II detector. The Belle II experiment operates at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. We measure decay-time distributions to determine CP -violating parameters S and C. We determine these parameters for two ranges of K_{S}^{0}π^{0} invariant mass: m(K_{S}^{0}π^{0})∈(0.8,1.0) GeV/c^{2}, which is dominated by B^{0}→K^{*0}(→K_{S}^{0}π^{0})γ decays, and a complementary region m(K_{S}^{0}π^{0})∈(0.6,0.8)∪(1.0,1.8) GeV/c^{2}. Our results have improved precision as compared to previous measurements and are consistent with theory predictions.

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