Measurement of electroweak parameters from Z decays into fermion pairs

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RESEARCH PRODUCT

Measurement of electroweak parameters from Z decays into fermion pairs

D Décamp B Deschizeaux C Giy J P Lees M N Minard R Alemany J M Crespo M C Delfino E Fernández V Gaitan L Garrido P Mato R Miquel M L Mir S Orteu A Pacheco J A Perlas E Tubau M G Catanesi D Creanza M De Palma A Farilla Giuseppe Iaselli G Maggi M Maggi S Natali S Nuzzo M Quattromini A Ranieri G Raso F Romano F Ruggieri G Selvaggi L Silvestris P Tempesta G Zito Y Gao H Hu D Huang S Jin J Lin T Ruan T Wang W Wu Y Xie D Xu R Xu J Zhang W Zhao H Albrecht W B Atwood F Bird E Blucher G Bonvicini F Bossi J Bourotte D Brown T H Burnett H Drevermann Friedrich Dydak Roger W Forty C Grab R Hagelberg S Haywood B Jost M Kasemann Gottfried Kellner J Knobloch A Lacourt Ivan Lehraus T Lohse D Lüke A Marchioro M Martínez J May S R Menary Adolf G Minten A Miotto J Nash P Palazzi F Ranjard G Redlinger A E Roth J E Rothberg Herbert Rotscheidt Wolfgang Von Rüden R Saint-denis W D Schlatter M Takashima M Talby Hans Taureg W Tejessy H W Wachsmuth S R Wasserbaech S Wheeler W Wiedenmann W Witzeling J Wotschack Ziad J Ajaltouni Maria Bardadin-otwinowska A Falvard R El-fellous P Gay P Henrard J Jousset B Michel J C Montret D Pallin P Perret J Proriol F Prulhière J D Hansen J R Hansen P H Hansen R Møllerud B S Nilsson G Petersen I Efthymiopoulos Errietta Simopoulou Anna Vayaki J Badier A Blondel G R Bonneaud F Braems J C Brient G Fouque A Gamess R Guirlet A Rosowsky A Rougé M Rumpf R Tanaka H L Videau I Videau D J Candlin G Parrini M Corden C H Georgiopoulos M Ikeda J E Lannutti D A Levinthal Michael E Mermikides L Sawyer G Stimpfl A Antonelli R Baldini G Bencivenni G Bologna P Campana G Capon V Chiarella B D'ettorre-piazzoli G Felici P Laurelli G Mannocchi F Massimo-brancaccio F Murtas G P Murtas G Nicoletti M Pepé-altarelli P Picchi P Zografou B Altoon O Boyle A W Halley I Ten Have J L Hearns J G Lynch W T Morton C Raine J M Scarr K Smith A S Thompson B Brandl O Braun R Geiges C Geweniger P Hanke V Hepp E E Kluge Y Maumary M Panter A Putzer B Rensch A Stahl K Tittel M Wunsch A T Belk R Beuselinck David M Binnie W Cameron M Cattaneo Peter J Dornan S Dugeay A M Greene J F Hassard S J Patton J K Sedgbeer G Taylor I R Tomalin A G Wright P Girtler E Kneringer D Kuhn G Rudolph C K Bowdery T J Brodbeck A J Finch F Foster G Hughes N R Keemer M Nuttall B S Rowlingson Terence Sloan S W Snow T Barczewski L A T Bauerdick K Kleinknecht B Renk S Roehn H G Sander M Schmelling F Steeg J P Albanese Jean-jacques Aubert C Benchouk V Bernard A Bonissent D Courvoisier F Etienne S Papalexiou P Payre B Pietrzyk Z Qian Walter Blum Paolo Walter Cattaneo G D Cowan Bernd Dehning H Dietl M Fernández-bosman M Frank A Jahn E Lange G Lütjens Gerhard Lutz W Männer H G Moser R H Richter A Schwarz Ronald Settles U Stiegler U Stierlin J Thomas V Bertin G De Bouard J Boucrot O Callot X Chen A Cordier M Davier G Ganis J F Grivaz P Heusse P Janot V Journé D W Kim J Lefrançois A M Lutz J J Veillet Z Zhang F Zomer S R Amendolia G Bagliesi G Batignani L Bosisio U Bottigli C Bradaschia M A Ciocci I Ferrante F Fidecaro L Foà E Focardi F Forti A Giassi M A Giorgi F Ligabue A Lusiani E B Mannelli P S Marrocchesi A Messineo Fabrizio Palla G Sanguinetti Jack Steinberger Roberto Tenchini G Tonelli G Triggiani J M Carter M G Green P V March T Medcalf M R Saich J A Strong R M Thomas T Wildish David R Botterill R W Clifft T R Edgecock M Edwards S M Fisher J Harvey T J Jones P R Norton D P Salmon J C Thompson B Bloch-devaux P Colas C Klopfenstein E Lançon E Locci Sotirios S Loucatos L Mirabito E Monnier P Pérez F Perrier J Rander J F Renardy A Roussarie J P Schuller John Gavin Ashman C N Booth F Combley M Dinsdale J Martín D Parker L F Thompson S Brandt H Burkhardt Claus Grupen H Meinhard E Neugebauer U Schäfer H C J Seywerd K Stupperich G Apollinari G Giannini B Gobbo F Liello E Milotti Luigi Rolandi L Bellantoni J F Boudreau D Cinabro J S Conway D F Cowen A J De Weerd Z Feng D P S Ferguson Y S Gao J L Harton J M Hilgart J E Jacobsen R C Jared R P Johnson B W Leclaire Pan Yi Bin T Parker J R Pater Y Saadi V Sharma J A Wear F V Weber Sau Lan Wu G Zobernig

subject

Physics Coupling constant Particle physics Physics and Astronomy (miscellaneous)media_common.quotation_subject Electron–positron annihilation Electroweak interaction Weinberg angle Fermion Asymmetry Nuclear physics High Energy Physics::Experiment Neutrino Nuclear Experiment Engineering (miscellaneous)Particle Physics - Experiment Lepton media_common

description

We report on the properties of theZ resonance from 62 500Z decays into fermion pairs collected with the ALEPH detector at LEP, the Large Electron-Positron storage ring at CERN. We findMZ=(91.193±0.016exp±0.030LEP) GeV, ΓZ=(2497±31) MeV, σhad0=(41.86±0.66)nb, and for the partial widths Γinv=(489±24) MeV, Γhad(1754±27) MeV, Γee=(85.0±1.6)MeV, Γμμ=(80.0±2.5) MeV, and Γττ=(81.3±2.5) MeV, all in good agreement with the Standard Model. Assuming lepton universality and using a lepton sample without distinction of the final state we measure Γu=(84.3±1.3) MeV. The forward-backward asymmetry in leptonic decays is used to determine the vector and axial-vector weak coupling constants of leptors,gv2(MZ2)=(0.12±0.12)×10−2 andgA2(MZ2)=0.2528±0.0040. The number of light neutrino species isNν=2.91±0.13; the electroweak mixing angle is sin2θW(MZ2)=0.2291±0.0040.

year	journal	country	edition	language
1990-01-01

10.1007/bf01572019 http://cds.cern.ch/record/210832