6533b854fe1ef96bd12adf5d

RESEARCH PRODUCT

A precise measurement of the Z resonance parameters through its hadronic decays

G. SetteP. SiegristJ-c. MarinSpyros TzamariasH. De BoeckB. Jean-marieM. TyndelP. VazJ. MaillardP. QueruD. BolliniG. LenzenA. A. RademakersV. PerevozchikovS. BiagiH. P. BornerH. FoethUgo GaspariniE. VelaP. NegriJ.h. BibbyCraig ButtarA. De AngelisA. De AngelisD. DelikarisM. De BeerGuido BarbielliniGuido BarbielliniJ. GuyGöran JarlskogJ. P. EngelM. V. Castillo GimenezN. Van EijndhovenV. RuhlmannJ. WernerDaniel BlochY. SacquinAhmimed OuraouG. DamgaardV.m. GolovatyukO. PingotG. W. Van ApeldoornL. BuggeA. Letessier-selvonTim AdyeA. J. Camacho RozasE. CastelliE. CastelliL. VenturaA. SebastiaD. Z. ToetT. BologneseHans MullerW. D. ApelG. EkspongP. N. BogolubovA. CampionE. Dahl-jensenGiovanni DarboV. GracoM. A. HouldenS. O. HolmgrenL. S. VertogradovS. SimonettiR. Zukanovich FunchalMarc WinterD. HussonSandor CzellarT. TodorovL. O. EekR. C. ShellardJosef HrubecI. A. TyapkinT. S. SpassoffH. WahlenTiziano CamporesiG. PolokR. LucockAriel GoobarJ. H. KoehnePatrick JarryG. RinaudoT. BuranC. Vander VeldeA. M. SegarG. CosmeA. BaroncelliNatale DemariaA. SadovskyP. S. IversenF. FontanelliA. MarkouJ. E. AugustinN. G. RedaelliGeorge KalkanisP. B. RentonMaria Elena PolD. C. FriesMarco BozzoJ. SkeensK. H. BecksE. C. KatsoufisE. VallazzaMarta CalviGeoffrey SmithF. AltedC. Astor FerreresW.s.c. WilliamsP. FrenkielP. IoannouG. Hamel De MonchenaultM. E. VeitchF. CouchotM. BonapartC. LambropoulosUgo AmaldiW. De BoerW. KucewiczC. CasoOlga BotnerKrzysztof KorcylF. LedroitG. StavropoulosJosef StraussE. LiebE. ZevgolatakosF. WaldnerF. WaldnerK. D. BrandS. KatsanevasM. PernickaM. BoratavV. ChorowiczC. WalckJ. BjarneW. VenusJ. VelascoJesus MarcoR. StrubJ. E. CampagneLouis LyonsTuure TuuvaG. WormserB. KorzenPieter DavidClara TronconB.d. HyamsM. L. TurluerB. KoeneE. MenichettiA.n. DiddensE. I. RosenbergAriella CattaiS. BraibantH. B. CrawleyR.b. KadyrovStefano RagazziItzhak RoditiGueorgui ChelkovStefaan TavernierA. M. LopezP. LaurikainenM. KoratzinosD. ReidJ. DreesF. HahnE. GrazianiT. KreuzbergerW. Van DoninckK. KurvinenW. KrupinskiR. SekulinPaolo MorettiniJ. G. LokenLeif J. JönssonEvangelos GazisP. BeilliereH. J. HilkeM. MazzucatoA. S. VodopianovW. A. MitaroffDemetrios LoukasM. JonkerLuca TortoraT. A. FilippasM. ReglerV. VrbaM. KopfT. MoaG. MaehlumF. CaoN. CroslandU. TrevisanF. UdoTord EkelofP. SzymanskiH. StaeckN. I. ZiminM. DracosE. K. JohanssonF. RichardC. MatteuzziA. SazonovM. HahnS. AlmehedFrancesca Romana CavalloA. B. FenyukMitchell WayneF. StichelbautP. HerquetR. ContriGianni ZumerleU. Nau-korzenM. TuralaJ.v. AllabyJ.a. VallsR. PainR. Mc KayCesare ChiccoliS. HaiderB. FranekO. BarringC. BosioB. LoerstadMaria Roberta MongeA. ZalewskaH. BurmeisterS. DagoretC. PinoriF. AdamiV. V. LapinR. ZitounJon Christopher WikneManolis DrisKlaus HamacherRobert S. BrownP. RoudeauC. DefoixP. Van DamF. Fulda-quenzerW. T. MeyerG. E. TheodosiouZ. HajdukP. AbreuP. BorgeaudMaciej GórskiK. W. GlitzaJacques LemonneRenato TurchettaD. SaccoC. De La VaissiereR. LlosaR. KeranenMikael BerggrenC. De ClercqWolfgang AdamTiziano RovelliM. CrestiDaniel TreilleS. GawnePhilippe CharpentierE. LillethunM. DavenportMatteo PegoraroJ. M. BrunetP. PoropatP. PoropatM. SchaefferK. SpangL. CerritoG. KantardjianH. MuellerA. HakanssonD. LangerveldA. PasseriV. LepeltierAndre AugustinusG. GaleazziA. FerrerM.d.m. De Fez LasoR. LauhakangasU. Kruener-marquisV. CanaleS. GumenyukR. A. BrennerS. J. AlvsvaagK. MoenigW. DulinskiP. V. ChliapnikovPaolo ChecchiaPawel JalochaBarry KingR. FrühwirthJ. TimmermansPaolo RoncheseC. J. BeestonJ. LindgrenG. VegniN. BrummerH. ForsbachG. ZhangA. P. OstankovPh. GavilletMario SanninoM. A. Lopez AgueraM. SessaM. SessaC. StanescuL. MathisK. DenisenkoE. FokitisW. H. RangeG. D. AlekseevJ. PyyhtiaA. PinsentLuc PapeR. OravaD.yu. BardinR. GokieliP. PriviteraG. BorisovS. SquarciaR. HolmesH. SaarikkoN. YamdagniPiotr ZalewskiB. De LottoB. De LottoB. BouquetMogens DamPaul BaillonAlexander Lincoln ReadM. SzeptyckaM. BaubillierG. CrosettiEvgueni VlasovH. HerrL. G. TkatchevM. Mc CubbinK. HultqvistJ. DolbeauP. KokkiniasM. Fernandez AlonsoP. BambadeG. TristramP.s.l. BoothP. N. RatoffV.a. UvarovTh. D. PapadopoulouV. ObraztsovGuenakh MitselmakherCharles BricmanPaula EerolaA. M. ZaitsevD.n. EdwardsC. KourkoumelisD. VilanovaG. E. KalmusM. P. ClaraH. PalkaG. SkjevlingJ. N. JacksonL. VibertP. BranchiniJ. W. LamsaH. SchneiderS. FerroniK. PakonskiE. TchernyaevF. BianchiKjell FranssonF. BaraoPierre BilloirR. DzhelyadinE. HigonR. SeufertJ. J. HernandezJose M. BenllochA. GrantP. O. HulthM.i. LaaksoF. ScuriF. ScuriHans DijkstraA. M. WetherellJ. Cuevas MaestroL. LanceriL. LanceriP. DelpierreE. DaubieL. Di CiaccioA. FirestoneM. VollmerD. BertrandPaolo GiacomelliG. MyattJ.m. GagoJanet HarrisB. GrosseteteAllan HallgrenGiovanni ValentiR. MoellerRoberto CirioL. K. ResvanisMassimo CacciaVladimir NikolaenkoP. JuillotF. DjamaE. SanchisB. Lund-jensenM. VoutilainenJoao VarelaG. GrosdidierM. CrozonS. UeberschaerA. MaltezosAlessandra RomeroA. RuizClaudia J. StubenrauchEleuterio SpiritiG. MatthiaeR. SosnowskiF. NaraghiE. LillestolB. DalmagneLaurent ChevalierM. NigroMilos LokajicekJ. KestemanK. WoschnaggG. GopalA.k. ToppholJ. E. HooperE. J. SanchezP. SimoneA. PulliaW. KlemptT. HofmoklMarek SzczekowskiE. RossoH. KleinM. S. BilenkyM. J. BatesL.j. CarrollToralf Bernhard SkaaliD. GambaP. WeilhammerI. BelokopytovE. AnassontzisG. VoulgarisF. SimonettoF. VerbeureF. KapustaA. TilquinG. LederB. ÅSmanFernand GrardD. CrennellF. MandlP. BeltranG. SmadjaB. W. HeckI. HerbstV. FalaleevI. LippiE.n. TsyganovJ. H. WickensJose Luis ContrerasJuan FusterD. RadojicicJan RidkyP. LutzPeter M. AllenM. PimentaB. A. KhomenkoN. De GrootA. StocchiFrancesco NavarriaJ. ZúñigaA. KlovningU. MjoernmarkPaolo PasiniJan KrolikowskiW. BartlH. FuerstenauJ. P. LaugierP. KapustaBorge Svane NielsenJ. J. LozanoM. H. GrosKrzysztof DorobaChiara MeroniJan BuytaertD. BenedicPeter Kluit

subject

Nuclear and High Energy PhysicsParticle physics[PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex]pragmatismtruthElectron–positron annihilationHadronfictionpossible worlds01 natural sciencesResonance (particle physics)webStandard ModelRDFNuclear physicsCross section (physics)semantic webesthetics0103 physical sciencesmemetic[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]010306 general physicsNuclear Experimentmetalanguagemodal logicPhysicsInternet010308 nuclear & particles physicstrust3. Good healthMassless particlePhysique des particules élémentairesHigh Energy Physics::ExperimentFísica nuclearNeutrinoBeam (structure)Particle Physics - Experiment

description

A measurement of the cross section for e+e-→ hadrons using 11 000 hadronic decays of the Z boson at ten different center-of-mass energies is presented. A three-parameter fit gives the following values for the Z mass MZ, the total width ΓZ, the product of the electronic and hadronic partial widths ΓeΓh, and the unfolded pole cross section σ0: MZ = 91.171 ± 0.030 (stat.) ± 0.030 (beam) GeV, ΓZ = 2.511 ± 0.065 GeV, ΓeΓh = 0.148 ± 0.006 (stat.) ± 0.004 (syst.) GeV2, σ0 = 41.6 ± 0.7 (stat.) ± 1.1 (syst.) nb, Good agreement with the predictions of the standard model is observed. From a two-parameter fit the number of massless neutrino generations is found to be Nv = 2.91 ± 0.26. Thus the hypothesis of a fourth neutrino with mass less than 40 GeV is excluded with 95% confidence level. Combining the cross section measurements with the ratio Γl/Γh reported in another DELPHI paper [Phys. Lett. B 241 (1990) 425], the hadronic, leptonic and invisible widths are found to be Γh = 1741 ± 61 MeV, Γl = 85.1 ± 2.9 MeV, Γh/Γl = 20.45 ± 0.98, Γinv = 515 ± 54 MeV, in good agreement with the standard model.

yearjournalcountryeditionlanguage
1990-01-01
10.1016/0370-2693(90)91668-2http://hdl.handle.net/10550/53858