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. 2025 Jul 25;135(4):041801.
doi: 10.1103/yzvh-v3hm.

Search for Lepton-Flavor-Violating Decay Modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} with Hadronic B Tagging at Belle and Belle II

I AdachiK AdamczykL AggarwalH AhmedH AiharaN AkopovM AlhakamiA AloisioN AlthubitiN Anh KyD M AsnerH AtmacanV AushevM AversanoR AyadV BabuH BaeN K BaghelS BahinipatiP BambadeSw BanerjeeS BansalM BarrettM BartlJ BaudotA BaurA BeaubienF BechererJ BeckerJ V BennettF U BernlochnerV BertacchiM BertemesE BertholetM BessnerS BettariniV BhardwajB BhuyanF BianchiD BiswasA BobrovD BodrovA BolzA BoschettiA BozekM BračkoP BranchiniR A BriereT E BrowderA BudanoS BussinoQ CampagnaM CampajolaL CaoG CasarosaC CecchiJ CerasoliM-C ChangP ChangR CheaibP CheemaB G CheonK ChilikinK ChirapatpimolH-E ChoK ChoS-J ChoS-K ChoiS ChoudhuryJ CochranL CoronaJ X CuiE De La Cruz-BureloS A De La MotteG de MarinoG De NardoG De PietroR de SangroM DestefanisS DeyR DhamijaA Di CantoF Di CapuaJ DingfelderZ DoležalI Domínguez JiménezT V DongX DongM DorigoD DossettS DubeyK DugicG DujanyP EckerP FeichtingerT FerberT FillingerC FinckG FinocchiaroA FodorF FortiB G FulsomA GabrielliE GanievM Garcia-HernandezR GargG GaudinoV GaurA GazA GellrichG GhevondyanD GhoshH GhumaryanG GiakoustidisR GiordanoA GiriP Gironella GironellA GlazovB GobboR GodangO GogotaP GoldenzweigW GradlS GranderathE GrazianiD GreenwaldZ GruberováY GuanK GudkovaI HaideY HanT HaraC HarrisK HayasakaH HayashiiS HazraC HeartyM T HedgesA HeidelbachI Heredia de la CruzM Hernández VillanuevaT HiguchiM HoekM HohmannR HoppeP HorakC-L HsuT HumairT IijimaK InamiG IngugliaN IpsitaA IshikawaR ItohM IwasakiD JacobiW W JacobsD E JaffeE-J JangQ P JiS JiaY JinA JohnsonK K JooH JunkerkalefeldM KaletaA B KaliyarJ KandraK H KangS KangG KaryanT KawasakiF KeilC KetterC KieslingC-H KimD Y KimJ-Y KimK-H KimY-K KimK KinoshitaP KodyšT KogaS KohaniK KojimaA KorobovS KorparE KovalenkoR KowalewskiP KrižanP KrokovnyT KuhrY KuliiD KumarR KumarK KumaraT KunigoA KuzminY-J KwonS LacapraraY-T LaiK LalwaniT LamL LanceriJ S LangeT S LauM LaurenzaR LeboucherF R Le DiberderM J LeeC LemettaisP LeoP M LewisC LiL K LiQ M LiW Z LiY LiY B LiY P LiaoJ LibbyJ LinS LinM H LiuQ Y LiuY LiuZ Q LiuD LiventsevS LongoT LueckT LuoC LyuY MaC MadaanM MaggioraS P MaharanaR MaitiG MancinelliR ManfrediE ManoniM MantovanoS MarcelloC MarinasC MartelliniA MartensA MartiniT MartinovL MassaccesiM MasudaD MatvienkoS K MauryaM MaushartJ A McKennaR MehtaF MeierD MeleshkoM MerolaC MillerM MirraS MitraK MiyabayashiH MiyakeG B MohantyS MondalS MonetaH-G MoserR MussaI NakamuraK R NakamuraM NakaoY NakazawaM NarukiZ NatkaniecA NatochiiM NayakG NazaryanM NeuS NishidaS OgawaH OnoY OnukiF OtaniG PakhlovaE PaoloniS PardiK ParhamH ParkJ ParkK ParkS-H ParkB PaschenA PasseriS PatraT K PedlarI PeruzziR PeschkeR PestotnikM PiccoloL E PiilonenP L M Podesta-LermaT PodobnikS PokharelC PrazS PrellE PrencipeM T PrimI PrudiievH PurwarP RadosG RaeuberS RaizN RaulsK RavindranJ U RehmanM ReifS ReiterM RemnevL ReuterD Ricalde HerrmannI Ripp-BaudotG RizzoS H RobertsonM RoehrkenJ M RoneyA RostomyanN RoutD A SandersS SandilyaL SanteljV SavinovB ScavinoS SchneiderG SchnellC SchwandaY SeinoA SelceK SenyoJ SerranoM E SeviorC SfientiW ShanC SharmaX D ShiT ShillingtonT ShimasakiJ-G ShiuD ShtolA SibidanovF SimonJ B SinghJ SkorupaR J SobieM SobotzikA SofferA SokolovE SolovievaS SpataroB SpruckW SongM StaričP StavroulakisS StefkovaR StroiliJ StrubeY SueM SumihamaK SumisawaW SutcliffeN SuwonjandeeH SvidrasM TakahashiM TakizawaU TamponiK TanidaF TenchiniA ThallerO TittelR TiwaryE TorassaK TrabelsiI TsaklidisI UedaT UglovK UngerY UnnoK UnoS UnoP UrquijoY UshirodaS E VahsenR van TonderK E VarvellM VeronesiA VinokurovaV S VismayaL VitaleV VobbilisettiR VolpeM WakaiS WallnerM-Z WangZ WangA WarburtonM WatanabeS WatanukiC WesselJ WiechczynskiE WonX P XuB D YabsleyS YamadaW YanJ YeltonJ H YinK YoshiharaC Z YuanJ YuanL ZaniF ZengB ZhangJ S ZhouQ D ZhouL ZhuV I ZhukovaR ŽlebčíkBelle and Belle II Collaborations

Search for Lepton-Flavor-Violating Decay Modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} with Hadronic B Tagging at Belle and Belle II

I Adachi et al. Phys Rev Lett. .

Abstract

We present the first search for the lepton-flavor-violating decay modes B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} (ℓ=μ,e) using the 711 and 365 fb^{-1} data samples recorded by the Belle and Belle II detectors, respectively. We use a hadronic B-tagging technique to fully reconstruct a B meson and search for signal decays in the system recoiling against the tagged meson, considering τ decays to either light leptons, one charged hadron, or one charged hadron and a neutral pion. We find no evidence for B^{0}→K_{S}^{0}τ^{±}ℓ^{∓} decays and set 90% confidence level upper limits on the branching fractions in the range of [0.8,3.6]×10^{-5}.

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