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. 2002 Nov 11;89(20):201802.
doi: 10.1103/PhysRevLett.89.201802. Epub 2002 Oct 29.

Measurement of the CP asymmetry amplitude sin2beta with B0 mesons

B Aubert  1 D BoutignyJ-M GaillardA HicheurY KaryotakisJ P LeesP RobbeV TisserandA ZghicheA PalanoA PompiliJ C ChenN D QiG RongP WangY S ZhuG EigenI OfteB StuguG S AbramsA W BorglandA B BreonD N BrownJ Button-ShaferR N CahnE CharlesM S GillA V GritsanY GroysmanR G JacobsenR W KadelJ KadykL T KerthYu G KolomenskyJ F KralC LeClercM E LeviG LynchL M MirP J OddoneT J OrimotoM PripsteinN A RoeA RomosanM T RonanV G ShelkovA V TelnovW A WenzelT J HarrisonC M HawkesD J KnowlesS W O'NealeR C PennyA T WatsonN K WatsonT DeppermannK GoetzenH KochB LewandowskiK PetersH SchmueckerM SteinkeN R BarlowW BhimjiJ T BoydN ChevalierP J ClarkW N CottinghamC MackayF F WilsonK AbeC HeartyT S MattisonJ A McKennaD ThiessenS JollyA K McKemeyV E BlinovA D BukinA R BuzykaevV B GolubevV N IvanchenkoA A KorolE A KravchenkoA P OnuchinS I SerednyakovYu I SkovpenA N YushkovD BestM ChaoD KirkbyA J LankfordM MandelkernS McMahonD P StokerC BuchananS ChunH K HadavandE J HillD B MacFarlaneH PaarS PrellSh RahatlouG RavenU SchwankeV SharmaJ W BerryhillC CampagnariB DahmesP A HartN KuznetsovaS L LevyO LongA LuM A MazurJ D RichmanW VerkerkeJ BeringerA M EisnerM GrotheC A HeuschW S LockmanT PulliamT SchalkR E SchmitzB A SchummA SeidenM TurriW WalkowiakD C WilliamsM G WilsonE ChenG P Dubois-FelsmannA DvoretskiiD G HitlinF C PorterA RydA SamuelS YangS JayatillekeG MancinelliB T MeadowsM D SokoloffT BarillariP BloomW T FordU NauenbergA OlivasP RankinJ RoyJ G SmithW C van HoekL ZhangJ L HartonT HuM KrishnamurthyA SofferW H TokiR J WilsonJ ZhangD AltenburgT BrandtJ BroseT ColbergM DickoppR S DubitzkyA HaukeE MalyR Müller-PfefferkornS OttoK R SchubertR SchwierzB SpaanL WildenD BernardG R BonneaudF BrochardJ Cohen-TanugiS FerragS T'JampensCh ThiebauxG VasileiadisM VerderiA AnjomshoaaR BernetA KhanD LavinF MuheimS PlayferJ E SwainJ TinslayM FalboC BoreanC BozziL PiemonteseA SartiE TreadwellF AnulliR Baldini-FerroliA CalcaterraR de SangroD FalciaiG FinocchiaroP PatteriI M PeruzziM PiccoloA ZalloS BagnascoA BuzzoR 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DittongoL LanceriP PoropatL VitaleG VuagninR S PanviniSw BanerjeeC M BrownD FortinP D JacksonR KowalewskiJ M RoneyH R BandS DasuM DattaA M EichenbaumH HuJ R JohnsonR LiuF Di LodovicoA MohapatraY PanR PrepostI J ScottS J SekulaJ H von Wimmersperg-ToellerJ WuS L WuZ YuH NealBABAR Collaboration
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Free article

Measurement of the CP asymmetry amplitude sin2beta with B0 mesons

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

Abstract

We present results on time-dependent CP asymmetries in neutral B decays to several CP eigenstates. The measurements use a data sample of about 88 x 10(6) Upsilon(4S)-->B(-)B decays collected between 1999 and 2002 with the BABAR detector at the PEP-II asymmetric-energy B factory at SLAC. We study events in which one neutral B meson is fully reconstructed in a final state containing a charmonium meson and the other B meson is determined to be either a B(0) or B(-0) from its decay products. The amplitude of the CP asymmetry, which in the standard model is proportional to sin2beta, is derived from the decay-time distributions in such events. We measure sin2beta=0.741+/-0.067(stat)+/-0.034(syst) and |lambda|=0.948+/-0.051(stat)+/-0.030(syst). The magnitude of lambda is consistent with unity, in agreement with the standard model expectation of no direct CP violation in these modes.

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