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. 2023 Jun 9;130(23):231801.
doi: 10.1103/PhysRevLett.130.231801.

Search for an Invisible Z^{'} in a Final State with Two Muons and Missing Energy at Belle II

I AdachiK AdamczykL AggarwalH AhmedH AiharaN AkopovA AloisioN Anh KyD M AsnerT AushevV AushevH BaeS BahinipatiP BambadeSw BanerjeeJ BaudotM BauerA BaurA BeaubienJ BeckerP K BeheraJ V BennettE BernieriF U BernlochnerV BertacchiM BertemesE BertholetM BessnerS BettariniB BhuyanF BianchiT BilkaD BiswasD BodrovA BolzJ BorahA BozekM BračkoP BranchiniT E BrowderA BudanoS BussinoM CampajolaL CaoG CasarosaC CecchiM-C ChangP ChangR CheaibP CheemaV ChekelianC ChenY Q ChenB G CheonK ChilikinK ChirapatpimolH-E ChoK ChoS-J ChoS-K ChoiS ChoudhuryD CinabroL CoronaS CunliffeS DasF DattolaE De La Cruz-BureloS A De La MotteG De NardoM De NuccioG De PietroR de SangroM DestefanisS DeyA De Yta-HernandezR DhamijaA Di CantoF Di CapuaJ DingfelderZ DoležalI Domínguez JiménezT V DongM DorigoK DortD DossettS DreyerS DubeyG DujanyP EckerM EliachevitchD EpifanovP FeichtingerT FerberD FerlewiczT FillingerC FinckG FinocchiaroA FodorF FortiB G FulsomE GanievM Garcia-HernandezV GaurA GazA GellrichG GhevondyanR GiordanoA GiriA GlazovB GobboR GodangP GoldenzweigS GranderathE GrazianiD GreenwaldZ GruberováT GuK GudkovaJ GuilliamsH HaighT HaraK HayasakaH HayashiiS HazraC HeartyI Heredia de la CruzM Hernández VillanuevaA HershenhornT HiguchiE C HillM HohmannC-L HsuT IijimaK InamiG IngugliaN IpsitaA IshikawaS ItoR ItohM IwasakiP JacksonW W JacobsD E JaffeE-J JangQ P JiS JiaY JinK K JooH JunkerkalefeldH KakunoA B KaliyarK H KangS KangR KarlG KaryanC KieslingC-H KimD Y KimK-H KimY-K KimH KindoK KinoshitaP KodyšT KogaS KohaniK KojimaT KonnoA KorobovS KorparE KovalenkoR KowalewskiT M G KraetzschmarP KrižanP KrokovnyT KuhrJ KumarK KumaraT KunigoA KuzminY-J KwonS LacapraraT LamL LanceriJ S LangeM LaurenzaK LautenbachR LeboucherF R Le DiberderP LeitlC LiL K LiJ LibbyK LieretZ LiptakQ Y LiuD LiventsevS LongoA LozarT LueckT LuoC LyuM MaggioraR MaitiS MaityR ManfrediE ManoniS MarcelloC MarinasL MartelA MartiniT MartinovL MassaccesiM MasudaK MatsuokaD MatvienkoS K MauryaJ A McKennaF MeierM MerolaF MetznerM MilesiC MillerK MiyabayashiR MizukG B MohantyN Molina-GonzalezS MonetaH-G MoserM MrvarR MussaI NakamuraK R NakamuraM NakaoH NakayamaY NakazawaA Narimani CharanM NarukiZ NatkaniecA NatochiiL NayakM NayakG NazaryanN K NisarS NishidaS OgawaH OnoY OnukiP OskinP PakhlovG PakhlovaA PaladinoA PantaE PaoloniS PardiK ParhamH ParkS-H ParkB PaschenA PasseriS PatraS PaulT K PedlarI PeruzziR PeschkeR PestotnikM PiccoloL E PiilonenG Pinna AngioniP L M Podesta-LermaT PodobnikS PokharelL PolatC PrazS PrellE PrencipeM T PrimH PurwarN RadP RadosG RaeuberS RaizA Ramirez MoralesM ReifS ReiterM RemnevI Ripp-BaudotG RizzoS H RobertsonD Rodríguez PérezJ M RoneyA RostomyanN RoutG RussoD A SandersS SandilyaA SangalL SanteljY SatoV SavinovB ScavinoJ SchuelerC SchwandaY SeinoA SelceK SenyoJ SerranoM E SeviorC SfientiC P ShenT ShillingtonJ-G ShiuA SibidanovF SimonJ B SinghJ SkorupaR J SobieA SofferA SokolovE SolovievaS SpataroB SpruckM StaričS StefkovaZ S StottlerR StroiliJ StrubeY SueM SumihamaK SumisawaW SutcliffeS Y SuzukiH SvidrasM TakizawaU TamponiK TanidaH TanigawaN TaniguchiF TenchiniA ThallerR TiwaryD TonelliE TorassaN ToutounjiK TrabelsiM UchidaI UedaY UematsuT UglovK UngerY UnnoK UnoS UnoY UshirodaS E VahsenR van TonderK E VarvellA VinokurovaL VitaleV VobbilisettiH M WakelingE WangM-Z WangX L WangA WarburtonM WatanabeS WatanukiM WelschC WesselX P XuB D YabsleyS YamadaW YanS B YangH YeJ H YinY M YookK YoshiharaC Z YuanY YusaL ZaniY ZhangV ZhilichQ D ZhouX Y ZhouV I ZhukovaR ŽlebčíkBelle II Collaboration

Search for an Invisible Z^{'} in a Final State with Two Muons and Missing Energy at Belle II

I Adachi et al. Phys Rev Lett. .

Abstract

The L_{μ}-L_{τ} extension of the standard model predicts the existence of a lepton-flavor-universality-violating Z^{'} boson that couples only to the heavier lepton families. We search for such a Z^{'} through its invisible decay in the process e^{+}e^{-}→μ^{+}μ^{-}Z^{'}. We use a sample of electron-positron collisions at a center-of-mass energy of 10.58 GeV collected by the Belle II experiment in 2019-2020, corresponding to an integrated luminosity of 79.7 fb^{-1}. We find no excess over the expected standard-model background. We set 90%-confidence-level upper limits on the cross section for this process as well as on the coupling of the model, which ranges from 3×10^{-3} at low Z^{'} masses to 1 at Z^{'} masses of 8 GeV/c^{2}.

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