Update of electroweak parameters fromZ decays

descriptionPublicationkeyboard_double_arrow_right Article 01 Mar 1993 Italy, Italy, France, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy English Publisher:Springer Science and Business Media LLCJournal:Zeitschrift für Physik C Particles and Fields, volume 60, pages 71-81 (issn: 0170-9739, eissn: 1434-6052,

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Authors: Buskulic, D.; Decamp, D.; Goy, C.; Lees, J P.; Minard, M N.; Mours, B.; Alemany, R.; +193 Authors

Buskulic, D.; Decamp, D.; Goy, C.; Lees, J P.; Minard, M N.; Mours, B.; Alemany, R.; Ariztizabal, F.; Comas, P.; Crespo, J M.; Delfino, M.; Fernandez, E.; Fernandez-Bosman, M.; Gaitan, V.; Garrido, L.; Mattison, T.; Pacheco, A.; Padilla, C.; Pascual, A.; Creanza, D.; de Palma, M.; Farilla, A.; Iaselli, G.; Maggi, G.; Maggi, M.; Natali, S.; Nuzzo, S.; Quattromini, M.; Ranieri, A.; Raso, G.; Romano, F.; Ruggieri, F.; Selvaggi, G.; Silvestris, L.; Tempesta, P.; Zito, G.; Chai, Y.; Hu, H.; Huang, D.; Huang, X.; Lin, J.; Wang, T.; Xie, Y.; Xu, D.; Xu, R.; Zhang, J.; Zhang, L.; Zhao, W.; Bauerdick, L a T.; Blucher, E.; Bonvicini, G.; Boudreau, J.; Casper, D.; Drevermann, H.; Forty, R W.; Ganis, G.; Gay, C.; Hagelberg, R.; Harvey, J.; Haywood, S.; Hilgart, J.; Jacobsen, R.; Jost, B.; Knobloch, J.; Lehraus, I.; Lohse, T.; Lusiani, A.; Martinez, M.; Mato, P.; Meinhard, H.; Minten, A.; Miotto, A.; Miquel, R.; Moser, H G.; Palazzi, P.; Perlas, J A.; Pusztaszeri, J F.; Ranjard, F.; Redlinger, G.; Rolandi, L.; Rothberg, J.; Ruan, T.; Saich, M.; Schlatter, D.; Schmelling, M.; Sefkow, F.; Tejessy, W.; Wachsmuth, H.; Wiedenmann, W.; Wildish, T.; Witzeling, W.; Wotschack, J.; Ajaltouni, Ziad; Badaud, F.; Bardadin-Otwinowska, M.; El-Fellous, R.; Falvard, Alain; Gay, Pascal; Guicheney, C.; Henrard, Pierre; Jousset, J.; Michel, B.; Montret, Jean-Claude; Pallin, D.; Perret, Pascal; Pietrzyk, B.; Proriol, Joseph; Prulhiere, F.; Saadi, F.; Fearnley, T.; Hansen, J D.; Hansen, J R.; Hansen, P H.; Mollerud, R.; Nilsson, B S.; Efthymiopoulos, I.; Kyriakis, A.; Simopoulou, E.; Vayaki, A.; Zachariadou, K.; Badier, J.; Blondel, A.; Bonneaud, G.; Brient, J C.; Fouque, G.; Orteu, S.; Rouge, A.; Rumpf, M.; Tanaka, R.; Verderi, M.; Videau, H.; Candlin, D J.; Parsons, M I.; Veitch, E.; Moneta, L.; Parrini, G.; Corden, M.; Georgiopoulos, C.; Ikeda, M.; Lannutti, J.; Levinthal, D.; Mermikides, M.; Sawyer, L.; Wasserbaech, S.; Antonelli, A.; Baldini, R.; Bencivenni, G.; Bologna, G.; Bossi, F.; Campana, P.; Capon, G.; Cerutti, F.; Chiarella, V.; d'Ettorre Piazzoli, B.; Felici, G.; Laurelli, P.; Mannocchi, G.; Murtas, F.; Murtas, G P.; Passalacqua, L.; Pepe-Altarelli, M.; Picchi, P.; Colrain, P.; ten Have, I.; Lynch, J G.; Maitland, W.; Morton, W T.; Raine, C.; Scarr, J M.; Smith, K.; Smith, M G.; Thompson, a S.; Turnbull, R M.; Brandl, B.; Braun, O.; Geweniger, C.; Hanke, P.; Hepp, V.; Kluge, E E.; Maumary, Y.; Putzer, A.; Rensch, B.; Stahl, A.; Tittel, K.; Wunsch, M.; Belk, a T.; Beuselinck, R.; Binnie, D M.; Cameron, W.; Cattaneo, M.; Colling, D J.; Dornan, P J.; Dugeay, S.; Greene, a M.; Hassard, J F.; Lieske, N M.; Nash, J.; Patton, S J.; Payne, D G.; Phillips, M J.;

doi: 10.1007/bf01650432

handle: 11588/509896 , 11368/2563478 , 2434/176246 , 10281/390410 , 11365/36391 , 11568/828612 , 11589/7595 , 11384/4999 , 2158/638307 , 11586/28666

Update of electroweak parameters fromZ decays

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Abstract

Based on 520 000 fermion pairs accumulated during the first three years of data collection by the ALEPH detector at LEP, updated values of the resonance parameters of the Z are determined to be M Z =(91.187±0.009) GeV, Γ Z =(2.501±0.012) GeV, σ{had/0}=(41.60±0.27) nb, and R l=20.78±0.13. The corresponding number of light neutrino species is N ν=2.97±0.05. The forward-backward asymmetry in lepton-pair decays is used to determine the ratio of vector to axial-vector couplings of leptons: g {/V 2}( M {/Z 2})/ g {/A 2}( M {/Z 2})=0.0052±0.0016. Combining this with ALEPH measurements of the b and c quark asymmetries and τ polarization gives sin2θ{/W eff}=0.2326±0.0013. Assuming the minimal Standard Model, and including measurements of M W / M Z from p bar p colliders and neutrino-nucleon scattering, the mass of the top quark isM_{top} = 156 ± begin{array}{*{20}c} {22} \ {25} \ ± begin{array}{*{20}c} {17} \ {22Higgs} \ GeV.

Countries

Italy, Italy, France, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy, Italy

Related Organizations

National Institute for Nuclear Physics
Italy
University of Innsbruck
Austria
University of Pisa
Italy
INFN Sezione di Firenze
Italy
Max Planck Society
Germany

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Keywords

ALEPH Experiment, [PHYS.HEXP] Physics [physics]/High Energy Physics - Experiment [hep-ex], Physics, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex]

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