We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at the Z peak with the L3 detector at LEP. The total luminosity of 40.8 pb-1 collected in the years 1990, 1991 and 1992 corresponds to 1.09 . 10(6) hadronic and 0.98 . 10(5) leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M(Z) = 91 195 +/- 9 MeV GAMMA(Z) = 2494 +/- 10 MeV GAMMA(had) = 1748 +/- 10 MeV GAMMA(l) = 83.49 +/- 0.46 MeV, assuming lepton universality. We obtain an invisible width of GAMMA(inv) = 496.5 +/- 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of N(v) = 2.981 +/- 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g(V)-l = -0.0378(+0.0045/-0.0042) g(A)-l = -0.4998 +/- 0.0014 Within the framework of the Standard Model, and including our measurements of the Z --> bbBAR forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin2 theta(W)BAR = 0.2326 +/- 0.0012. We obtain an estimate for the strong coupling constant, alpha(s) = 0.142 +/- 0.013, and for the top-quark mass, m(t) = 158(+32/-40) +/- 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass.

Measurement of Cross-sections and Leptonic Forward-backward Asymmetries At the Z-pole and Determination of Electroweak Parameters / M. ACCIARRI;A. ADAM;O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;J. ALCARAZ;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q. AN;H. ANDERHUB;A. L. ANDERSON;V. P. ANDREEV;T. ANGELESCU;L. ANTONOV;D. ANTREASYAN;G. ALKHAZOV;P. ARCE;A. AREFIEV;T. AZEMOON;T. AZIZ;P. V. K.;P. BAGNAIA;J. A. BAKKEN;L. BAKSAY;R. C. BALL;S. BANERJEE;K. BANICZ;J. BAO;R. BARILLERE;L. BARONE;A. BASCHIROTTO;R. BATTISTON;A. BAY;F. BECATTINI;U. BECKER;F. BEHNER;G. L. BENCZE;J. BERDUGO;P. BERGES;B. BERTUCCI;B. L. BETEV;M. BIASINI;A. BILAND;G. M. BILEI;R. BIZZARRI;J. J. BLAISING;G. J. BOBBINK;R. BOCK;A. BOHM;B. BORGIA;D. BOURILKOV;M. BOURQUIN;D. BOUTIGNY;B. BOUWENS;E. BRAMBILLA;J. G. BRANSON;V. BRIGLJEVIC;I. C. BROCK;M. BROOKS;A. BUJAK;J. D. BURGER;W. J. BURGER;C. BURGOS;J. BUSENITZ;A. BUYTENHUIJS;A. BYKOV;X. D. CAI;M. CAPELL;M. CARIA;G. CARLINO;A. M. CARTACCI;J. CASAUS;R. CASTELLO;N. CAVALLO;M. CERRADA;F. CESARONI;M. CHAMIZO;Y. H. CHANG;U. K. CHATURVEDI;M. CHEMARIN;A. CHEN;C. CHEN;G. CHEN;G. M. CHEN;H. F. CHEN;H. S. CHEN;M. CHEN;G. CHIEFARI;C. Y. CHIEN;M. T. CHOI;S. CHUNG;C. CIVININI;I. CLARE;R. CLARE;T. E. COAN;H. O. COHN;G. COIGNET;N. COLINO;A. CONTIN;S. COSTANTINI;F. COTOROBAI;B. DELACRUZ;X. T. CUI;X. Y. CUI;T. S. DAI;R. DALESSANDRO;R. DEASMUNDIS;A. DEGRE;K. DEITERS;E. DENES;P. DENES;F. DENOTARISTEFANI;D. DIBITONTO;M. DIEMOZ;H. R. DIMITROV;C. DIONISI;M. DITTMAR;L. DJAMBAZOV;M. T. DOVA;E. DRAGO;D. DUCHESNEAU;P. DUINKER;I. DURAN;S. EASO;H. ELMAMOUNI;A. ENGLER;F. J. EPPLING;F. C. ERNE;P. EXTERMANN;R. FABBRETTI;M. FABRE;S. FALCIANO;S. J. FAN;A. FAVARA;J. FAY;M. FELCINI;T. FERGUSON;D. FERNANDEZ;G. FERNANDEZ;F. FERRONI;H. FESEFELDT;E. FIANDRINI;J. H. FIELD;F. FILTHAUT;P. H. FISHER;G. FORCONI;L. FREDJ;K. FREUDENREICHG;W. FRIEBEL;M. FUKUSHIMA;M. GAILLOUD;Y. GALAKTINOV;E. GALLO;S. N. GANGULI;P. GARCIAABIA;S. GENTILE;N. GHEORDANESCU;S. GIAGU;S. GOLDFARB;Z. F. GONG;E. GONZALEZ;A. GOUGAS;D. GOUJON;G. GRATTA;M. W. GRUENEWALD;C. GU;M. GUANZIROLI;J. K. GUO;V. K. GUPTA;A. GURTU;H. R. GUSTAFSON;L. J. GUTAY;K. HANGARTER;A. HASAN;D. HAUSCHILDT;C. F. HE;J. T. HE;T. HEBBEKER;M. HEBERT;A. HERVE;K. HILGERS;H. HOFER;H. HOORANI;S. R. HOU;G. HU;G. Q. HU;B. LLE;M. M. ILYAS;V. INNOCENTE;H. JANSSEN;B. N. JIN;L. W. JONES;I. J. JOSAMUTUBERRIA;A. KASSER;R. A. KHAN;Y. KAMYSHKOV;P. KAPINOS;J. S. KAPUSTINSKY;Y. KARYOTAKIS;M. KAUR;S. KHOKHAR;M. N. KIENZLEFOCACCI;J. K. KIM;S. C. KIM;Y. G. KIM;W. W. KINNISON;A. KIRKBY;D. KIRKBY;S. KIRSCH;W. KITTEL;A. KLIMENTOV;A. C. KONIG;E. KOFFEMAN;O. KORNADT;V. KOUTSENKO;A. KOULBARDIS;R. W. KRAEMER;T. KRAMER;V. R. KRASTEV;W. KRENZ;H. KUIJTEN;K. S. KUMAR;A. KUNIN;P. L. DEGUEVARA;G. LANDI;D. LANSKE;S. LANZANO;A. LEBEDEV;P. LEBRUN;P. LECOMTE;P. LECOQ;P. LECULTRE;D. M. LEE;J. S. LEE;K. Y. LEE;I. LEEDOM;C. LEGGETT;J. M. LEGOFF;R. LEISTE;M. LENTI;E. LEONARDI;P. LEVTCHENKO;C. LI;H. T. LI;P. J. LI;J. Y. LIAO;W. T. LIN;Z. Y. LIN;F. L. LINDE;B. LINDEMANN;L. LISTA;Y. LIU;W. LOHMANN;E. LONGO;W. LU;Y. S. LU;J. M. LUBBERS;K. LUBELSMEYER;C. LUCI;D. LUCKEY;L. LUDOVICI;L. LUMINARI;W. LUSTERMANN;J. M. MA;W. G. MA;M. MACDERMOTT;L. MALGERI;R. MALIK;A. MALININ;C. MANA;M. MAOLINBAY;P. MARCHESINI;F. MARION;A. MARIN;J. P. MARTIN;F. MARZANO;G. G. MASSARO;K. MAZUMDAR;P. MCBRIDE;T. MCMAHON;D. MCNALLY;M. MERK;L. MEROLA;M. MESCHINI;W. J. METZGER;Y. MI;A. MIHUL;G. B. MILLS;Y. MIR;G. MIRABELLI;J. MNICH;M. MOLLER;B. MONTELEONI;R. MORAND;S. MORGANTI;N. E. MOULAI;R. MOUNT;S. MULLER;E. NAGY;M. NAPOLITANO;F. NESSITEDALDI;H. NEWMAN;M. A. NIAZ;A. NIPPE;H. NOAK;G. ORGANTINI;D. PANDOULAS;S. PAOLETTI;P. PAOLUCCI;G. PASCALE;G. PASSALEVA;S. PATRICELLI;T. PAUL;M. PAULUZZI;C. PAUS;F. PAUSS;Y. J. PEI;S. PENSOTTI;D. PERRETGALLIX;J. PERRIER;A. PEVSNER;D. PICCOLO;M. PIERI;J. C. PINTO;P. A. PIROUE;F. PLASIL;V. PLYASKIN;M. POHL;V. POJIDAEV;H. POSTEMA;Z. D. QI;J. M. QIAN;K. N. QURESHI;R. RAGHAVAN;G. RAHALCALLOT;P. G. RANCOITA;M. RATTAGGI;G. RAVEN;P. RAZIS;K. READ;M. REDAELLI;D. 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C. TONWAR;J. TOTH;A. TSAREGORODTSEV;G. TSIPOLITIS;C. TULLY;K. L. TUNG;T. TUUVA;J. ULBRICHT;L. URBAN;U. UWER;E. VALENTE;R. T. VANDEWALLE;I. VETLITSKY;G. VIERTEL;P. VIKAS;U. VIKAS;M. VIVARGENT;H. VOGEL;H. VOGT;I. VOROBIEV;A. A. VOROBYOV;A. A. VOROBYOV;L. VUILLEUMIER;M. WADHWA;W. WALLRAFF;J. C. WANG;C. R. WANG;X. L. WANG;Y. F. WANG;Z. M. WANG;A. WEBER;J. WEBER;R. WEILL;J. WENNINGER;M. WHITE;C. WILLMOTT;F. WITTGENSTEIN;D. WRIGHT;S. X. WU;S. WYNHOFF;B. WYSLOUCH;Y. Y. XIE;J. G. XU;Z. Z. XU;Z. L. XUE;D. S. YAN;B. Z. YANG;C. G. YANG;C. G. YANG;G. YANG;C. H. YE;J. B. YE;Q. YE;S. C. YEH;Z. W. YIN;J. M. YOU;N. YUNUS;M. YZERMAN;C. ZACCARDELLI;P. ZEMP;M. ZENG;Y. ZENG;D. H. ZHANG;Z. P. ZHANG;B. ZHOU;G. J. ZHOU;J. F. ZHOU;R. Y. ZHU;A. ZICHICHI;B. C. C.. - In: ZEITSCHRIFT FÜR PHYSIK. C, PARTICLES AND FIELDS. - ISSN 0170-9739. - STAMPA. - 62:(1994), pp. 551-573.

Measurement of Cross-sections and Leptonic Forward-backward Asymmetries At the Z-pole and Determination of Electroweak Parameters

ADRIANI, OSCAR;D'ALESSANDRO, RAFFAELLO;M. LENTI;
1994

Abstract

We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at the Z peak with the L3 detector at LEP. The total luminosity of 40.8 pb-1 collected in the years 1990, 1991 and 1992 corresponds to 1.09 . 10(6) hadronic and 0.98 . 10(5) leptonic Z decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of the Z boson: M(Z) = 91 195 +/- 9 MeV GAMMA(Z) = 2494 +/- 10 MeV GAMMA(had) = 1748 +/- 10 MeV GAMMA(l) = 83.49 +/- 0.46 MeV, assuming lepton universality. We obtain an invisible width of GAMMA(inv) = 496.5 +/- 7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species of N(v) = 2.981 +/- 0.050. Using also the three leptonic forward-backward asymmetries and the average tau polarization, we determine the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons to be: g(V)-l = -0.0378(+0.0045/-0.0042) g(A)-l = -0.4998 +/- 0.0014 Within the framework of the Standard Model, and including our measurements of the Z --> bbBAR forward-backward asymmetry and partial decay width, we derive an effective electroweak mixing angle of sin2 theta(W)BAR = 0.2326 +/- 0.0012. We obtain an estimate for the strong coupling constant, alpha(s) = 0.142 +/- 0.013, and for the top-quark mass, m(t) = 158(+32/-40) +/- 19(Higgs) GeV, where the second error arises due to the uncertainty in the Higgs-boson mass.
1994
62
551
573
M. ACCIARRI;A. ADAM;O. ADRIANI;M. AGUILARBENITEZ;S. AHLEN;J. ALCARAZ;A. ALOISIO;G. ALVERSON;M. G. ALVIGGI;G. AMBROSI;Q. AN;H. ANDERHUB;A. ...espandi
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/772802
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