Measurements of the Lineshape of the $Z^{0}$ and Determination of Electroweak Parameters from its Hadronic and Leptonic Decays

6533b7d5fe1ef96bd12652cf

RESEARCH PRODUCT

Measurements of the Lineshape of the $Z^{0}$ and Determination of Electroweak Parameters from its Hadronic and Leptonic Decays

P Abreu W Adam T Adye E Agasi Roy Aleksan G D Alekseev A Algeri P P Allport S Almehed F D'almeida S J Alvsvaag Ugo Amaldi A Andreazza P Antilogus W D Apel R J Apsimon Y Arnoud B ÅSman J E Augustin A Augustinus Paul Baillon P Bambade F Barão R Barate Guido Barbiellini Dimitri Yuri Bardin G J Barker A Baroncelli O Bärring J A Barrio Walter Bartl M J Bates Marco Battaglia M Baubillier K H Becks M Begalli P Beillière Yu A Belokopytov P Beltran Alberto C Benvenuti M Berggren D Bertrand F Bianchi M Bigi S M Bilenky P Billoir J Bjarne D Bloch J Blocki S Blyth V Bocci P N Bogolubov T Bolognese M Bonesini W Bonivento P S L Booth G Borisov C Bosio B Bostjancic S Bosworth O Botner E Boudinov B Bouquet C Bourdarios T J V Bowcock M Bozzo S Braibant P Branchini K D Brand R A Brenner H Briand C Bricman L Brillault R C A Brown P Brückman J M Brunet A P Budziak L Bugge T Buran A Buys J Buytaert M Caccia M Calvi A J Camacho-rozas R Campion T Camporesi V Canale K Cankocak F Cao F Carena P Carrilho L Carroll Carlo Caso M V Castillo-gimenez A Cattai F R Cavallo L Cerrito V Chabaud A Chan P Charpentier J Chauveau P Checchia G A Chelkov L Chevalier P V Chliapnikov V Chorowicz J T M Chrin V Cindro P Collins J L Contreras R Contri E Cortina G Cosme F Couchot H B Crawley D J Crennell G Crosetti J Cuevas-maestro S Czellar Erik Dahl-jensen J Dahm B D'almagne M Dam G Damgaard Evelyne Daubie A Daum P D Dauncey Martyn Davenport J Davies W Da Silva C Defoix P A Delpierre N Demaria A De Angelis H De Boeck Wim De Boer S De Brabandere C De Clercq M D M De Fez Laso C De La Vaissière B De Lotto A De Min L S De Paula H Dijkstra Lucia Di Ciaccio F Djama J Dolbeau M Dönszelmann K Doroba M Dracos J Drees M Dris Y Dufour F Dupont D M Edsall L O Eek R Ehret T J C Ekelöf Gösta Ekspong A Elliot-peisert M Elsing J P Engel N Ershaidat M C Espirito-santo V P Falaleev D Fassouliotis Michael Feindt A Ferrer A Filippas-tassos A Firestone H Föth E Fokitis F Fontanelli K A J Forbes J L Fousset S Francon B J Franek P Frenkiel D E C Fries A G Frodesen R Frühwirth F Fulda-quenzer H Fürstenau J A Fuster D Gamba M Gandelman C García J García C Gaspar U Gasparini P Gavillet E N Gazis J P Gerber P Giacomelli D Gillespie R Gokieli B Golob V M Golovatyuk J J Gómez-cadenas Gian P Gopal L Gorn M Górski Valerio Gracco F Grard E Graziani G Grosdidier B Grossetête P Gunnarsson J Guy U Haedinger F Hahn M Hahn S Hahn S Haider Z Hajduk A Hakansson A Hallgren K Hamacher G Hamel De Monchenault W Hao F J Harris V Hedberg R P Henriques J J Hernández J A Hernando P Herquet H Herr T L Hessing I Hietanen C O Higgins E Higón Hans Jürgen Hilke T S Hill S D Hodgson T Hofmokl S O Holmgren P J Holt D J Holthuizen P F Honoré M A Houlden Josef Hrubec K Huet K Hultqvist P Ioannou P S Iversen J N Jackson R Jacobsson P Jalocha G Jarlskog P Jarry B Jean-marie E K Johansson M Jonker L B Jönsson P Juillot G Kalkanis George Ernest Kalmus F Kapusta M Karlsson E Karvelas S Katsanevas E C Katsoufis R Keränen B A Khomenko N N Khovanskii B J King N J Kjaer H Klein A Klovning P M Kluit A Koch-mehrin J H Köhne B Köne P Kokkinias M Koratzinos A V Korytov V Kostyukhin C Kourkoumelis O Kuznetsov P H Kramer Manfred Krammer C Kreuter J Królikowski I J Kronkvist W Kucewicz K Kulka K L Kurvinen C Lacasta C Lambropoulos J Lamsa L Lanceri P Langefeld V Lapin I Last J P Laugier R Lauhakangas Gerhard Leder F Ledroit R Leitner Y Lemoigne J Lemonne Georg Lenzen V Lepeltier J M Lévy E H Lieb J Lindgren R Lindner A Lipniacka I Lippi B Lörstad M Lokajícek J G Loken A López-fernandez M A López-aguera M E Los D Loukas J Lozano-bahilo P Lutz L Lyons G Maehlum J Maillard A Maio A Maltezos F Mandl J Marco B Maréchal M Margoni J C Marin C Mariotti A Markou T Maron S Martí C Martínez-rivero F Martínez-vidal F Matorras C Matteuzzi Giorgio Matthiae M Mazzucato M L Mccubbin R Mckay R Mcnulty J Medbo C Meroni W T Meyer M Michelotto I Mikulec L Mirabito Winfried A Mitaroff G Mitselmakher U Mjörnmark T Moa R Møller K Mönig M R Monge P Morettini H Müller W J Murray B Muryn Gerald Myatt F Naraghi Francesco Luigi Navarria P Negri S Némécek W Neumann N Neumeister R Nicolaidou B S Nielsen V Nikolaenko P E S Nilsen P Niss A Nomerotski V F Obraztsov A G Olshevskii Risto Orava A P Ostankov K ÖSterberg A Ouraou P Paganini M Paganoni R Pain H Palka T D Papadopoulou L Pape F Parodi A Passeri M Pegoraro J Pennanen L Peralta H Pernegger Manfred Pernicka A Perrotta C Petridou A Petrolini G Piana F Pierre M Pimenta S Plaszczynski O Podobrin M E Pol G Polok P Poropat V Pozdnyakov M Prest P Privitera Antonio Pullia D Radojicic S Ragazzi H Rahmani J Rames P N Ratoff A L Read M Reale P Rebecchi N G Redaelli Meinhard Regler D Reid P B Renton L K Resvanis F Richard M Richardson J Rídky G Rinaudo A Romero I Roncagliolo P Ronchese C Rönnqvist E I Rosenberg E Rosso Patrick Roudeau T Rovelli W Rückstuhl V Ruhlmann-kleider A Ruiz K Rybicki H Saarikko Yu Sacquin G Sajot J Salt J Sánchez M Sannino S Schael H Schneider M A E Schyns G Sciolla F Scuri A M Segar A Seitz R L Sekulin M I Sessa R Seufert R C Shellard I Siccama P Siegrist S Simonetti F Simonetto A N Sissakian G Skjevling G Smadja N Smirnov O G Smirnova G R Smith R Sosnowski D Souza-santos Tz Spassoff E Spiriti S Squarcia H Stäck C Stanescu Steinar Stapnes G D Stavropoulos F Stichelbaut A Stocchi J Strauss J Straver R Strub B Stugu M Szczekowski M Szeptycka P Szymanski T Tabarelli De Fatis O G Chikilev G E Theodosiou Z D Thomé A Tilquin J Timmermans V G Timofeev L G Tkatchev T Todorov D Z Toet O Toker A G Tomaradze B Tomé E Torassa L Tortora D Treille W Trischuk G Tristram C Troncon A L Tsirou E N Tsyganov Michal Turala M L Turluer T Tuuva I A Tyapkin M Tyndel S Tzamarias B ÜBerschär S ÜBerschär O Ullaland V Uvarov G Valenti E Vallazza J A Valls Ferrer C Van Der Velde G W Van Apeldoorn P Van Dam M Van Der Heijden W K Van Doninck J Van Eldik P Vaz G Vegni L Ventura W A Venus F Verbeure M Verlato L S Vertogradov D Vilanova P Vincent L Vitale E Vlasov A S Vodopyanov M Vollmer M Voutilainen V Vrba H Wahlen C Walck F Waldner A Wehr M Weierstall Peter Weilhammer Alan M Wetherell J H Wickens M Wielers G R Wilkinson W S C Williams M Winter G Wormser K Woschnagg A Zaitsev A Zalewska-bak L Zanini D Zavrtanik E Zevgolatakos N I Zimin M Zito D Zontar R Zuberi G Zumerle J Zúñiga

subject

Nuclear and High Energy Physics Particle physics Electron–positron annihilation LEP-SLC ENERGIES Elementary particle 01 natural sciences 7. Clean energy Partícules (Física nuclear)PHYSICS Nuclear physics BHABHA SCATTERING Particle decay 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]RADIATIVE-CORRECTIONS LEP-SLC ENERGIES; RADIATIVE-CORRECTIONS; BHABHA SCATTERING; MASS CORRECTIONS; PHYSICS 010306 general physics Detectors de radiació DELPHI Bhabha scattering Physics 010308 nuclear & particles physics Physics DELPHI; Z0 resonance; mass corrections; radiative corrections Mathematics::History and Overview High Energy Physics::Phenomenology Electroweak interaction Weinberg angle MASS CORRECTIONS radiative corrections Z0 resonance Higgs boson High Energy Physics::Experiment Particle Physics - Experiment Lepton

description

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 and improved knowledge of the LEP beam energies permit significantly better measurements of the mass and width of the Z0 resonance. Model independent fits to the cross sections and leptonic forward-backward asymmetries 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 hadronic and leptonic partial widths GAMMA(had) = 1.725 +/- 0.012GeV, GAMMA(l) = 83.01 +/- 0.52 MeV, the invisible width GAMMA(inv) = 512 +/- 10 MeV, 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 from DELPHI data, the number of light neutrino species is determined to be 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 asymmetries and assuming lepton universality, the squared vector and axial-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 Standard Model fit to the data yields a value of the top mass m(t) = 115(-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.)-0.0004(+0.0001) (Higgs). Values are obtained for the variables S and T, or epsilon1 and epsilon3 which parameterize electroweak loop effects.

year	journal	country	edition	language
1994-01-01

10.1016/0550-3213(94)90537-1 http://cds.cern.ch/record/258291