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. 2009 Oct 16;103(16):161801.
doi: 10.1103/PhysRevLett.103.161801. Epub 2009 Oct 15.

Evidence for the eta(b)(1S) meson in radiative Upsilon(2S) decay

B Aubert  1 M BonaY KaryotakisJ P LeesV PoireauE PrencipeX PrudentV TisserandJ Garra TicoE GraugesL LopezA PalanoM PappagalloG EigenB StuguL SunM BattagliaD N BrownL T KerthYu G KolomenskyG LynchI L OsipenkovK TackmannT TanabeC M HawkesN SoniA T WatsonH KochT SchroederD J AsgeirssonB G FulsomC HeartyT S MattisonJ A McKennaM BarrettA KhanA Randle-CondeV E BlinovA D BukinA R BuzykaevV P DruzhininV B GolubevA P OnuchinS I SerednyakovYu I SkovpenE P SolodovK Yu TodyshevM BondioliS CurryI EschrichD KirkbyA J LankfordP LundM MandelkernE C MartinD P StokerS AbachiC BuchananH AtmacanJ W GaryF LiuO LongG M VitugZ YasinL ZhangV SharmaC CampagnariT M HongD KovalskyiM A MazurJ D RichmanT W BeckA M EisnerC A HeuschJ KrosebergW S LockmanA J MartinezT SchalkB A SchummA SeidenL O WinstromC H ChengD A DollB EchenardF FangD G HitlinI NarskyT PiatenkoF C PorterR AndreassenG MancinelliB T MeadowsK MishraM D SokoloffP C BloomW T FordA GazJ F HirschauerM NagelU NauenbergJ G SmithS R WagnerR AyadA SofferW H TokiR J WilsonE FeltresiA HaukeH JasperM KarbachJ MerkelA PetzoldB SpaanK WackerM J KobelR NogowskiK R SchubertR SchwierzA VolkD BernardG R BonneaudE LatourM VerderiP J ClarkS PlayferJ E WatsonM AndreottiD BettoniC BozziR CalabreseA CecchiG CibinettoP FranchiniE LuppiM NegriniA PetrellaL PiemonteseV SantoroR Baldini-FerroliA CalcaterraR de SangroG FinocchiaroS PacettiP PatteriI M PeruzziM PiccoloM RamaA ZalloR ContriM Lo VetereM R MongeS PassaggioC PatrignaniE RobuttiS TosiK S ChaisanguanthumM MoriiA AdametzJ MarksS SchenkU UwerF U BernlochnerV KloseH M LackerD J BardP D DaunceyM TibbettsP K BeheraX ChaiM J CharlesU MallikJ CochranH B CrawleyL DongW T MeyerS PrellE I RosenbergA E RubinY Y GaoA V GritsanZ J GuoN ArnaudJ BéquilleuxA D'OrazioM DavierJ Firmino da CostaG GrosdidierF Le DiberderV LepeltierA M LutzS PruvotP RoudeauM H SchuneJ SerranoV SordiniA StocchiG WormserD J LangeD M WrightI BinghamJ P BurkeC A ChavezJ R FryE GabathulerR GametD E HutchcroftD J PayneC TouramanisA J BevanC K ClarkeF Di LodovicoR SaccoM SigamaniG CowanS ParamesvaranA C WrenD N BrownC L DavisA G DenigM FritschW GradlK E AlwynD BaileyR J BarlowG JacksonG D LaffertyT J WestJ I YiJ AndersonC ChenA JawaheryD A RobertsG SimiJ M TuggleC DallapiccolaE SalvatiS SaremiR CowanD DujmicP H FisherS W HendersonG SciollaM SpitznagelF TaylorR K YamamotoM ZhaoP M PatelS H RobertsonA LazzaroV LombardoF PalomboJ M BauerL CremaldiR GodangR KroegerD J SummersH W ZhaoM SimardP TarasH NicholsonG De NardoL ListaD MonorchioG OnoratoC SciaccaG RavenH L SnoekC P JessopK J KnoepfelJ M LoseccoW F WangL A CorwinK HonscheidH KaganR KassJ P MorrisA M RahimiJ J RegensburgerS J SekulaQ K WongN L BlountJ BrauR FreyO IgonkinaJ A KolbM LuR RahmatN B SinevD StromJ StrubeE TorrenceG CastelliN GagliardiM MargoniM MorandinM PosoccoM RotondoF SimonettoR StroiliC VociP Del Amo SanchezE Ben-HaimH BriandJ ChauveauO HamonPh LerusteJ OcarizA PerezJ PrendkiS SittL GladneyM BiasiniE ManoniC AngeliniG BatignaniS BettariniG CalderiniM CarpinelliA CervelliF FortiM A GiorgiA LusianiG MarchioriM MorgantiN NeriE PaoloniG RizzoJ J WalshD Lopes PegnaC LuJ OlsenA J S SmithA V TelnovF AnulliE BaracchiniG CavotoR FacciniF FerrarottoF FerroniM GasperoP D JacksonL Li GioiM A MazzoniS MorgantiG PireddaF RengaC VoenaM EbertT HartmannH SchröderR WaldiT AdyeB FranekE O OlaiyaF F WilsonS EmeryL EsteveG Hamel de MonchenaultW KozaneckiG VasseurCh YècheM ZitoX R ChenH LiuW ParkM V PurohitR M WhiteJ R WilsonM T AllenD AstonR BartoldusJ F BenitezR CenciJ P ColemanM R ConveryJ C DingfelderJ DorfanG P Dubois-FelsmannW DunwoodieR C FieldA M GabareenM T GrahamP GrenierC HastW R InnesJ KaminskiM H KelseyH KimP KimM L KocianD W G S LeithS LiB LindquistS LuitzV LuthH L LynchD B MacfarlaneH MarsiskeR MessnerD R MullerH NealS NelsonC P O'GradyI OfteM PerlB N RatcliffA RoodmanA A SalnikovR H SchindlerJ SchwieningA SnyderD SuM K SullivanK SuzukiS K SwainJ M ThompsonJ Va'vraA P WagnerM WeaverC A WestW J WisniewskiM WittgenD H WrightH W WulsinA K YarrituK YiC C YoungV ZieglerP R BurchatA J EdwardsT S MiyashitaS AhmedM S AlamJ A ErnstB PanM A SaeedS B ZainS M SpanierB J WogslandR EckmannJ L RitchieA M RulandC J SchillingR F SchwittersB W DrummondJ M IzenX C LouF BianchiD GambaM PelliccioniM BombenL BosisioC CartaroG Della RiccaL LanceriL VitaleV AzzoliniN Lopez-MarchF Martinez-VidalD A MilanesA OyangurenJ AlbertSw BanerjeeB BhuyanH H F ChoiK HamanoG J KingR KowalewskiM J LewczukI M NugentJ M RoneyR J SobieT J GershonP F HarrisonJ IlicT E LathamG B MohantyE M T PuccioH R BandX ChenS DasuK T FloodY PanR PrepostC O VuosaloS L WuBABAR Collaboration
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Free article

Evidence for the eta(b)(1S) meson in radiative Upsilon(2S) decay

B Aubert et al. Phys Rev Lett. .
Free article

Abstract

We have performed a search for the eta_{b}(1S) meson in the radiative decay of the Upsilon(2S) resonance using a sample of 91.6x10(6) Upsilon(2S) events recorded with the BABAR detector at the PEP-II B factory at the SLAC National Accelerator Laboratory. We observe a peak in the photon energy spectrum at Egamma=609.3(-4.5)(+4.6)(stat)+/-1.9(syst) MeV, corresponding to an eta(b)(1S) mass of 9394.2(-4.9)(+4.8)(stat)+/-2.0(syst) MeV/c2. The branching fraction for the decay Upsilon(2S)-->gamma(eta)b(1S) is determined to be [3.9+/-1.1(stat)-0.9+1.1(syst)]x10(-4). We find the ratio of branching fractions B[Upsilon(2S)-->gamma(eta)b(1S)]/B[Upsilon(3S)-->gamma(eta)b(1S)]=0.82+/-0.24(stat)(-0.19)(+0.20)(syst).

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