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. 2023 Sep 22;131(12):121802.
doi: 10.1103/PhysRevLett.131.121802.

Search for a τ^{+}τ^{-} Resonance in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} Events with the Belle II Experiment

I AdachiK AdamczykL AggarwalH AhmedH AiharaN AkopovA AloisioN Anh KyD M AsnerH AtmacanT AushevV AushevM AversanoV BabuH BaeS BahinipatiP BambadeSw BanerjeeS BansalM BarrettJ BaudotM BauerA BaurA BeaubienJ BeckerP K BeheraJ V BennettE BernieriF U BernlochnerV BertacchiM BertemesE BertholetM BessnerS BettariniV BhardwajB BhuyanF BianchiT BilkaS BilokinD BiswasA BobrovD BodrovA BolzJ BorahA BozekM BračkoP BranchiniT E BrowderA BudanoS BussinoM CampajolaL CaoG CasarosaC CecchiJ CerasoliM-C ChangP ChangR CheaibP CheemaV ChekelianY Q ChenB G CheonK ChilikinK ChirapatpimolH-E ChoK ChoS-J ChoS-K ChoiS ChoudhuryD CinabroJ CochranL CoronaL M CremaldiS CunliffeT CzankS DasF DattolaE De La Cruz-BureloS A De La MotteG de MarinoG 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 FortiA FreyB G FulsomA GabrielliE GanievM Garcia-HernandezA GarmashG GaudinoV GaurA GazA GellrichG GhevondyanD GhoshH GhumaryanG GiakoustidisR GiordanoA GiriA GlazovB GobboR GodangO GogotaP GoldenzweigW GradlT GrammaticoS GranderathE GrazianiD GreenwaldZ GruberováT GuY GuanK GudkovaJ GuilliamsS HalderY HanT HaraK HayasakaH HayashiiS HazraC HeartyM T HedgesI Heredia de la CruzM Hernández VillanuevaA HershenhornT HiguchiE C HillH HirataM HoekM HohmannC-L HsuT HumairT IijimaK InamiG IngugliaN IpsitaA IshikawaS ItoR ItohM IwasakiP JacksonW W JacobsD E JaffeE-J JangQ P JiS JiaY JinA JohnsonK K JooH JunkerkalefeldH KakunoM KaletaD KalitaA B KaliyarJ KandraK H KangS KangR KarlG KaryanT KawasakiF KeilC KetterC KieslingC-H KimD Y KimK-H KimY-K KimH KindoP KodyšT KogaS KohaniK KojimaT KonnoA KorobovS KorparE KovalenkoR KowalewskiT M G KraetzschmarP KrižanP KrokovnyT KuhrJ KumarM KumarR KumarK KumaraT KunigoA KuzminY-J KwonS LacapraraY-T LaiT LamL LanceriJ S LangeM LaurenzaK LautenbachR LeboucherF R Le DiberderP LeitlD LevitP M LewisC LiL K LiY B LiJ LibbyK LieretQ Y LiuZ Q LiuD LiventsevS LongoA LozarT LueckC LyuY MaM MaggioraS P MaharanaR MaitiS MaityR ManfrediE ManoniA C MantheiM MantovanoD MarcantonioS MarcelloC MarinasL MartelC MartelliniA MartiniT MartinovL MassaccesiM MasudaT MatsudaK MatsuokaD MatvienkoS K MauryaJ A McKennaR MehtaM MerolaF MetznerM MilesiC MillerM MirraK MiyabayashiH MiyakeR MizukG B MohantyN Molina-GonzalezS MondalS MonetaH-G MoserM MrvarR MussaI NakamuraK R NakamuraM NakaoH NakayamaH NakazawaY NakazawaA Narimani CharanM NarukiD NarwalZ NatkaniecA NatochiiL NayakM NayakG NazaryanC NiebuhrN K NisarS NishidaS OgawaH OnoY OnukiP OskinF OtaniP PakhlovG PakhlovaA PaladinoA PantaE PaoloniS PardiK ParhamJ ParkS-H ParkB PaschenA PasseriS PatraS PaulT K PedlarI PeruzziR PeschkeR PestotnikF PhamM 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 RizzoL B RizzutoS H RobertsonD Rodríguez PérezM RoehrkenJ M RoneyA RostomyanN RoutG RussoD SahooD A SandersS SandilyaA SangalL SanteljY SatoV SavinovB ScavinoM SchnepfJ SchuelerC SchwandaY SeinoA SelceK SenyoJ SerranoM E SeviorC SfientiW ShanC SharmaC P ShenX D ShiT ShillingtonJ-G ShiuD ShtolB ShwartzA SibidanovF SimonJ B SinghJ SkorupaR J SobieM SobotzikA SofferA SokolovE SolovievaS SpataroB SpruckM StaričP StavroulakisS StefkovaZ S StottlerR StroiliJ StrubeY SueM SumihamaK SumisawaW SutcliffeS Y SuzukiH SvidrasM TakahashiM TakizawaU TamponiS TanakaK TanidaH TanigawaF TenchiniA ThallerR TiwaryD TonelliE TorassaN ToutounjiK TrabelsiI TsaklidisM UchidaI UedaY UematsuT UglovK UngerY UnnoK UnoS UnoP UrquijoY UshirodaS E VahsenR van TonderG S VarnerK E VarvellA VinokurovaV S VismayaL VitaleV VobbilisettiR VolpeA VossenB WachM WakaiH M WakelingS WallnerE WangM-Z WangX L WangZ WangA WarburtonM WatanabeS WatanukiM WelschC WesselE WonX P XuB D YabsleyS YamadaW YanS B YangH YeJ YeltonJ H YinY M YookK YoshiharaC Z YuanY YusaL ZaniY ZhaiY ZhangV ZhilichJ S ZhouQ D ZhouX Y ZhouV I ZhukovaR ŽlebčíkBelle II Collaboration

Search for a τ^{+}τ^{-} Resonance in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} Events with the Belle II Experiment

I Adachi et al. Phys Rev Lett. .

Abstract

We report the first search for a nonstandard-model resonance decaying into τ pairs in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} events in the 3.6-10 GeV/c^{2} mass range. We use a 62.8 fb^{-1} sample of e^{+}e^{-} collisions collected at a center-of-mass energy of 10.58 GeV by the Belle II experiment at the SuperKEKB collider. The analysis probes three different models predicting a spin-1 particle coupling only to the heavier lepton families, a Higgs-like spin-0 particle that couples preferentially to charged leptons (leptophilic scalar), and an axionlike particle, respectively. We observe no evidence for a signal and set exclusion limits at 90% confidence level on the product of cross section and branching fraction into τ pairs, ranging from 0.7 to 24 fb, and on the couplings of these processes. We obtain world-leading constraints on the couplings for the leptophilic scalar model for masses above 6.5 GeV/c^{2} and for the axionlike particle model over the entire mass range.

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