6533b860fe1ef96bd12c3991

RESEARCH PRODUCT

Correlation measurements in Z→τ+τ− and the τ neutrino helicity

D. BuskulicI. De BonisD. DecampP. GhezC. GoyJ.-p. LeesM.-n. MinardB. PietrzykF. AriztizabalP. ComasJ.m. CrespoM. DelfinoI. EfthymiopoulosE. FernandezM. Fernandez-bosmanV. GaitanLl. GarridoT. MattisonA. PachecoC. PadillaA. PascualD. CreanzaM. De PalmaA. FarillaG. IaselliG. MaggiN. MarinelliS. NataliS. NuzzoA. RanieriG. RasoF. RomanoF. RuggieriG. SelvaggiL. SilvestrisP. TempestaG. ZitoY. ChaiH. HuD. HuangX. HuangJ. LinT. WangY. XieD. XuR. XuJ. ZhangL. ZhangW. ZhaoG. BonviciniJ. BoudreauD. CasperH. DrevermannR.w. FortyG. GanisC. GayM. GironeR. HagelbergJ. HarveyJ. HilgartR. JacobsenB. JostJ. KnoblochI. LehrausM. MaggiC. MarkouM. MartinezP. MatoH. MeinhardA. MintenR. MiquelH.-g. MoserP. PalazziJ.r. PaterJ.a. PerlasP. PerrodoJ.-f. PusztaszeriF. RanjardL. RolandiJ. RothbergT. RuanM. SaichD. SchlatterM. SchmellingF. SefkowW. TejessyI.r. TomalinR. VeenhofH. WachsmuthS. WasserbaechW. WiedenmannT. WildishW. WitzelingJ. WotschackZ. AjaltouniM. Bardadin-otwinowskaA. BarresC. BoyerA. FalvardP. GayC. GuicheneyP. HenrardJ. JoussetB. MichelJ-c. MontretD. PallinP. PerretF. PodlyskiJ. ProriolF. SaadiT. FearnleyJ.b. HansenJ.d. HansenJ.r. HansenP.h. HansenR. MøllerudB.s. NilssonA. KyriakisE. SimopoulouI. SiotisA. VayakiK. ZachariadouJ. BadierA. BlondelG. BonneaudJ.c. BrientP. BourdonG. FouqueS. OrteuA. RougéM. RumpfR. TanakaM. VerderiH. VideauD.j. CandlinM.i. ParsonsE. VeitchE. FocardiL. MonetaG. ParriniM. CordenC. GeorgiopoulosD.e. JaffeD. LevinthalA. AntonelliR. BaldiniG. BencivenniG. BolognaF. BossiP. CampanaG. CaponF. CeruttiV. ChiarellaG. FeliciP. LaurelliG. MannocchiF. MurtasG.p. MurtasL. PassalacquaM. Pepe-altarelliP. ColrainI. Ten HaveJ.g. LynchW. MaitlandW.t. MortonC. RaineP. ReevesJ.m. ScarrK. SmithM.g. SmithA.s. ThompsonR.m. TurnbullB. BrandlO. BraunC. GewenigerP. HankeV. HeppE.e. KlugeY. MaumaryA. PutzerB. RenschA. StahlK. TittelM. WunschR. BeuselinckD.m. BinnieW. CameronM. CattaneoD.j. CollingP.j. DornanJ.f. HassardN.m. LieskeA. MoutoussiJ. NashS. PattonD.g. PayneM.j. PhillipsG. San MartinJ.k. SedgbeerA.g. WrightP. GirtlerD. KuhnG. RudolphR. VoglC.k. BowderyT.j. BrodbeckA.j. FinchF. FosterG. HughesD. JacksonN.r. KeemerM. NuttallA. PatelT. SloanS.w. SnowE.p. WhelanA.m. GreeneK. KleinknechtJ. RaabB. RenkH.-g. SanderH. SchmidtS.m. WaltherR. WankeB. WolfA. ZimmermannA.m. BencheikhC. BenchoukA. BonissentD. CalvetJ. CarrP. CoyleC. DiaconuJ. DrinkardF. EtienneD. NicodP. PayreL. RoosD. RousseauP. SchwemlingM. TalbyS. AdlungR. AssmannC. BauerW. BlumD. BrownP. CattaneoB. DehningH. DietlF. DydakM. FrankA.w. HalleyK. JakobsJ. LauberG. LütjensG. LutzW. MännerR. RichterJ. SchröderA.s. SchwarzR. SettlesH. SeywerdU. StierlinU. StieglerR. St. DenisG. WolfR. AlemanyJ. BoucrotO. CallotA. CordierM. DavierL. DuflotJ.-f. GrivazPh. HeusseP. JanotD.w. KimfnF. Le DiberderJ. LefrançoisA.-m. LutzM.-h. SchuneJ.-j. VeilletI. VideauZ. ZhangD. AbbaneoG. BagliesiG. BatignaniU. BottigliC. BozziG. CalderiniM. CarpinelliM.a. CiocciV. CiulliR. Dell'orsoI. FerranteF. FidecaroL. FoàF. FortiA. GiassiM.a. GiorgiA. GregorioF. LigabueA. LusianiE.b. MannelliP.s. MarrocchesiA. MessineoF. PallaG. RizzoG. SanguinettiP. SpagnoloJ. SteinbergerR. TenchiniG. TonelliG. TriggianiA. ValassiC. VanniniA. VenturiP.g. VerdiniJ. WalshA.p. BetteridgeY. GaoM.g. GreenD.l. JohnsonP.v. MarchT. MedcalfLl.m. MirI.s. QuaziJ.a. StrongD.r. BotterillR.w. ClifftT.r. EdgecockS. HaywoodP.r. NortonJ.c. ThompsonB. Bloch-devauxP. ColasH. DuarteS. EmeryW. KozaneckiE. LançonM.c. LemaireE. LocciB. MarxP. PerezJ. RanderJ.-f. RenardyA. RosowskyA. RoussarieJ.-p. SchullerJ. SchwindlingD. Si MohandB. VallageR.p. JohnsonA.m. LitkeG. TaylorJ. WearW. BabbageC.n. BoothC. ButtarS. CartwrightF. CombleyI. DawsonL.f. ThompsonE. BarberioA. BöhrerS. BrandtG. CowanC. GrupenG. LuttersF. RiveraU. SchäferL. SmolikL. BosisioR. Della MarinaG. GianniniB. GobboL. PitisF. RagusaL. BellantoniW. ChenJ.s. ConwayZ. FengD.p.s. FergusonY.s. GaoJ. GrahlJ.l. HartonO.j. HayesJ.m. NachtmanY.b. PanY. SaadiM. SchmittI. ScottV. SharmaZ.h. ShiJ.d. TurkA.m. WalshF.v. WeberNull Sau Lan WuX. WuM. ZhengG. Zobernig

subject

PhysicsNuclear and High Energy PhysicsParticle physics010308 nuclear & particles physicsElectron–positron annihilationElementary particle01 natural sciencesHelicityNuclear physicsALEPH Experiment0103 physical sciencesNeutrino010306 general physicsALEPH experiment

description

Using data collected with the ALEPH detector at LEP correlations between the decay products of the τ+ and τ- produced in the decay of the Z have been measured. The measurements performed in the decays τ-->πν and τ-->ϱν place limits on deviations from the Standard Model. These are given by the parameter ζ with ζ = -1 for the Standard Model. The measured values are ζπ = -0.95 +/- 0.11 +/- 0.05 and ζϱ = -1.03 +/- 0.11 +/- 0.05. For models which predict ζπ = ζϱ = ζ - interpreted as the average τ neutrino helicity - the measurement is ζ = -0.99 +/- 0.07 +/- 0.04.

10.1016/0370-2693(94)90345-xhttps://hdl.handle.net/11368/2563421