MEASUREMENTS OF THE LINESHAPE OF THE Z(0) AND DETERMINATION OF ELECTROWEAK PARAMETERS FROM ITS HADRONIC AND LEPTONIC DECAYS

Authors
ABREU P ADAM W ADYE T AGASI E ALEKSAN R ALEKSEEV GD ALLPORT P ALMEHED S ALMEIDA FML ALVSVAAG SJ AMALDI U ANDREAZZA A ANTILOGUS P APEL WD APSIMON RJ ARNOUD Y ASMAN B AUGUSTIN JE AUGUSTINUS A BAILLON P BAMBADE P BARAO F BARATE R BARBIELLINI G BARDIN DY BARKER GJ BARONCELLI A BARRING O BARRIO JA BARTL W BATES MJ BATTAGLIA M BAUBILLIER M BECKS KH BEGALLI M BEILLIERE P BELOKOPYTOV Y BELTRAN P BENVENUTI AC BERGGREN M BERTRAND D BIANCHI F BIGI M BILENKY MS BILLOIR P BJARNE J BLOCH D BLOCKI J BLYTH S BOCCI V BOGOLUBOV PN BOLOGNESE T BONESINI M BONIVENTO W BOOTH PSL BORISOV G BOSIO C BOSTJANCIC B BOSWORTH S BOTNER O BOUDINOV E BOUQUET B BOURDARIOS C BOWCOCK TJV BOZZO M BRAIBANT S BRANCHINI P BRAND KD BRENNER RA BRIAND H BRICMAN C BRILLAULT L BROWN RCA BRUCKMAN P BRUNET JM BUDZIAK A BUGGE L BURAN T BUYS A BUYTAERT JAMA CACCIA M CALVI M ROZAS AJC CAMPION R CAMPORESI T CANALE V CANKOCAK K CAO F CARENA F CARRILHO P CARROLL L CASES R CASO C GIMENEZ MVC CATTAI A CAVALLO FR CERRITO L CHABAUD V CHAN A CHARPENTIER P CHAUVEAU J CHECCHIA P CHELKOV GA CHEVALIER L CHLIAPNIKOV P CHOROWICZ V CHRIN JTM CINDRO V COLLINS P CONTRERAS JL CONTRI R CORTINA E COSME G COUCHOT F CRAWLEY HB CRENNELL D CROSETTI G MAESTRO JC CZELLAR S DAHLJENSEN E DAHM J DALMAGNE B DAM M DAMGAARD G DAUBIE E DAUM A DAUNCEY PD DAVENPORT M DAVIES J DASILVA W DEFOIX C DELPIERRE P DEMARIA N DEANGELIS A DEBOECK H DEBOER W DEBRABANDERE S DECLERCQ C LASO MDMD DELAVAISSIERE C DELOTTO B DEMIN A DEPAULA L DIJKSTRA H DICIACCIO L DJAMA F DOLBEAU J DONSZELMANN M DOROBA K DRACOS M DREES J DRIS M DUFOUR Y DUPONT F EDSALL D EEK LO EHRET R EKELOF T EKSPONG G PEISERT AE ELSING M ENGEL JP ERSHAIDAT N SANTO ME FALALEEV V FASSOULIOTIS D FEINDT M FERRER A FILIPPAS TA FIRESTONE A FOETH H FOKITIS E FONTANELLI F FORBES KAJ FORMENTI F FOUSSET JL FRANCON S FRANEK B FRENKIEL P FRIES DC FRODESEN AG FRUHWIRTH R FULDAQUENZER F FURSTENAU H FUSTER J GAMBA D GANDELMAN M GARCIA C GARCIA J GASPAR C GASPARINI U GAVILLET P GAZIS EN GERBER JP GIACOMELLI P GILLESPIE D GOKIELI R GOLOB B GOLOVATYUK VM CADENAS JJGY GOPAL G GORN L GORSKI M GRACCO V GRARD F GRAZIANI E GROSDIDIER G GROSSETETE B GUNNARSSON P GUY J HAEDINGER U HAHN F HAHN M HAHN S HAIDER S HAJDUK Z HAKANSSON A HALLGREN A HAMACHER K DEMONCHENAULT GH HAO W HARRIS FJ HEDBERG V HENRIQUES R HERNANDEZ JJ HERNANDO JA HERQUET P HERR H HESSING TL HIGGINS CO HIGON E HILKE HJ HILL TS HODGSON SD HOFMOKL T HOLMGREN SO HOLT PJ HOLTHUIZEN D HONORE PF HOULDEN M HRUBEC J HUET K HULTQVIST K IOANNOU P IVERSEN PS JACKSON JN JACOBSSON R JALOCHA P JARLSKOG G JARRY P JEANMARIE B JOHANSSON EK JONKER M JONSSON L JUILLOT P KAISER M KALKANIS G KALMUS G KAPUSTA F KARLSSON M KARVELAS E KATSANEVAS S KATSOUFIS EC KERANEN R KHOMENKO BA KHOVANSKI NN KING B KJAER NJ KLEIN H KLOVNING A KLUIT P KOCHMEHRIN A KOEHNE JH KOENE B KOKKINIAS P KORATZINOS M KORYTOV AV KOSTIOUKHINE V KOURKOUMELIS C KOUZNETSOV O KRAMER PH KRAMMER M KREUTER C KROLIKOWSKI J KRONKVIST I KUCEWICZ W KULKA K KURVINEN K LACASTA C LAMBROPOULOS C LAMSA JW LANCERI L LANGEFELD P LAPIN V LAST I LAUGIER JP LAUHAKANGAS R LEDER G LEDROIT F LEITNER R LEMOIGNE Y LEMONNE J LENZEN G LEPELTIER V LEVY JM LIEB E LINDNER R LIPNIACKA A LIPPI I LOERSTAD B LOKAJICEK M LOKEN JG LOPEZFERNANDEZ A AGUERA MAL LOS M LOUKAS D LOZANO JJ LUTZ P LYONS L MAEHLUM G MAILLARD J MAIO A MALTEZOS A MANDL F MARCO J MARECHAL B MARGONI M MARIN JC MARIOTTI C MARKOU A MARON T MARTI S MARTINEZRIVERO C MARTINEZVIDAL F MATORRAS F MATTEUZZI C MATTHIAE G MAZZUCATO M MCCUBBIN M MCKAY R MCNULTY R MEDBO J MERONI C MEYER WT MICHELOTTO M MIGLIORE E MIKULEC I MIRABITO L MITAROFF WA MITSELMAKHER GV MJOERNMARK U MOA T MOELLER R MOENIG K MONGE MR MORETTINI P MUELLER H MURRAY WJ MURYN B MYATT G NARAGHI F NAVARRIA FL NEGRI P NEMECEK S NEUMANN W NEUMEISTER N NICOLAIDOU R NIELSEN BS NIKOLAENKO V NILSEN PES NISS P NOMEROTSKI A OBRAZTSOV V OLSHEVSKI AG ORAVA R OSTANKOV A OSTERBERG K OURAOU A PAGANINI P PAGANONI M PAIN R PALKA H PAPADOPOULOU TD PAPE L PARODI F PASSERI A PEGORARO M PENNANEN J PERALTA L PERNEGGER H PERNICKA M PERROTTA A PETRIDOU C PETROLINI A PIANA G PIERRE F PIMENTA M PLASZCZYNSKI S PODOBRIN O POL ME POLOK G POROPAT P POZDNIAKOV V PREST M PRIVITERA P PULLIA A RADOJICIC D RAGAZZI S RAHMANI H RAMES J RATOFF PN READ AL REALE M REBECCHI P REDAELLI NG REGLER M REID D RENTON PB RESVANIS LK RICHARD F RICHARDSON J RIDKY J RINAUDO G ROMERO A RONCAGLIOLO I RONCHESE P ROSENBERG EI ROSSO E ROUDEAU P ROVELLI T RUCKSTUHL W RUHLMANNKLEIDER V RUIZ A RYBICKI K SAARIKKO H SACQUIN Y SAJOT G SALT J SANCHEZ J SANNINO M SCHAEL S SCHNEIDER H SCHYNS MAE SCIOLLA G SCURI F SEGAR AM SEITZ A SEKULIN R SESSA M SEUFERT R SHELLARD RC SICCAMA I SIEGRIST P SIMONETTI S SIMONETTO F SISAKIAN AN SKJEVLING G SMADJA G SMIRNOV N SMIRNOVA O SMITH GR SOSNOWSKI R SOUZASANTOS D SPASSOV T SPIRITI E SQUARCIA S STAECK H STANESCU C STAPNES S STAVROPOULOS G STICHELBAUT F STOCCHI A STRAUSS J STRAVER J STRUB R STUGU B SZCZEKOWSKI M SZEPTYCKA M SZYMANSKI P TABARELLI T TCHIKILEV O THEODOSIOU GE THOME Z TILQUIN A TIMMERMANS J TIMOFEEV VG TKATCHEV LG TODOROV T TOET DZ TOMARADZE A TOME B TORASSA E TORTORA L TREILLE D TRISCHUK W TRISTRAM G TRONCON C TSIROU A TSYGANOV EN TURALA M
Citation
P. Abreu et al., MEASUREMENTS OF THE LINESHAPE OF THE Z(0) AND DETERMINATION OF ELECTROWEAK PARAMETERS FROM ITS HADRONIC AND LEPTONIC DECAYS, Nuclear physics. B, 417(1-2), 1994, pp. 3-57
Citations number
35
Categorie Soggetti
Physics, Nuclear
Journal title
Nuclear physics. B → ACNP
ISSN journal
05503213
Volume
417
Issue
1-2
Year of publication
1994
Pages
3 - 57
Database
ISI
SICI code
0550-3213(1994)417:1-2<3:MOTLOT>2.0.ZU;2-4
Abstract
During the LEP running periods in 1990 and 1991 DELPHI has accumulated approximately 450000 Z0 decays into hadrons and charged leptons. The increased event statistics coupled with improved analysis techniques a nd improved knowledge of the LEP beam energies permit significantly be tter measurements of the mass and width of the Z0 resonance. Model ind ependent fits to the cross sections and leptonic forward-backward asym metries yield the following Z0 parameters: the mass and total width M( Z) = 91.187 +/- 0.009 GeV, GAMMA(Z) = 2.486 +/- 0.012 GeV, the hadroni c and leptonic partial widths GAMMA(had) = 1.725 +/- 0.012GeV, GAMMA(l ) = 83.01 +/- 0.52 MeV, the invisible width GAMMA(inv) = 512 +/- 10 Me V, the ratio of hadronic to leptonic partial widths R(l) = 20.78 +/- 0 .15, and the Born level hadronic peak cross section sigma0 = 40.90 +/- 0.28 nb. Using these results and the value of alpha(s) determined fro m DELPHI data, the number of light neutrino species is determined to b e 3.08 +/- 0.05. The individual leptonic widths are found to be: GAMMA (e) = 82.93 +/- 0.70 MeV, GAMMA(mu) = 83.20 +/- 1.11 MeV and GAMMA(tau ) = 82.89 +/- 1.31 MeV. Using the measured leptonic forward-backward a symmetries and assuming lepton universality, the squared vector and ax ial-vector couplings of the Z0 to charged leptons are found to be g(V) l2 = (1.47 +/- 0.51) x 10(-3) and g(A)l2 = 0.2483 +/- 0.0016. A full S tandard Model fit to the data yields a value of the top mass m(t) = 11 5(-82)+52 (expt.)-24(+23) (Higgs) GeV, corresponding to a value of the weak mixing angle sin2 theta(eff)lept = 0.2339 +/- 0.0015(expt.)-0.00 04(+0.0001) (Higgs). Values are obtained for the variables S and T, or epsilon1 and epsilon3 which parameterize electroweak loop effects.