Measurement of electroweak parameters fromZ decays into fermion pairs

ALEPH Collaboration,D. Decamp, B. Deschizeaux,C. Goy,J. -P. Lees,M. -N. Minard, R. Alemany,J. M. Crespo,M. Delfino,E. Fernandez,V. Gaitan, Ll. Garrido,P. Mato,R. Miquel,Ll. M. Mir,S. Orteu,A. Pacheco, J. A. Perlas, E. Tubau,M. G. Catanesi, D. Creanza,M. de Palma,A. Farilla,G. 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, F. Dydak, R. W. Forty,C. Grab, R. Hagelberg, S. Haywood, B. Jost, M. Kasemann, G. Kellner, J. Knobloch, A. Lacourt, I. Lehraus, T. Lohse,D. Lüke,A. Marchioro,M. Martinez,J. May, S. Menary, A. Minten, A. Miotto, J. Nash,P. Palazzi, F. Ranjard, G. Redlinger,A. Roth, J. Rothberg, H. Rotscheidt,W. von Rüden,R. St. Denis, D. Schlatter, M. Takashima,M. Talby,H. Taureg, W. Tejessy,H. Wachsmuth, S. Wasserbaech,S. Wheeler, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. 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, E. Simopoulou, A. Vayaki,J. Badier, A. Blondel, G. Bonneaud, F. Braems, J. C. Brient, G. Fouque, A. Gamess, R. Guirlet, A. Rosowsky, A. Rougé,M. Rumpf, R. Tanaka,H. Videau, I. Videau, D. J. Candlin, G. Parrini,M. Corden, C. Georgiopoulos,M. Ikeda, J. Lannutti, D. Levinthal, M. 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. Pepe-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, D. M. Binnie,W. Cameron,M. Cattaneo,P. 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, T. 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,J-J. Aubert, C. Benchouk,V. Bernard, A. Bonissent, D. Courvoisier, F. Etienne, S. Papalexiou, P. Payre, B. Puietrzyk,Z. Qian, W. Blum, P. Cattaneo,G. Cowan,B. Dehning,H. Dietl, M. Fernandez-Bosman,M. Frank,A. Jahn,E. Lange, G. Lütjens, G. Lutz, W. Männer,H-G. Moser, Y. Pan, R. Richter,A. S. Schwarz,R. 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,Ph. 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,F. Palla,G. Sanguinetti,J. Steinberger, R. 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, D. 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, S. Loucatos, L. Mirabito, E. Monnier, P. Perez,F. Perrier, J. Rander, J. -F. Renardy, A. Roussarie,J. -P. Schuller, J. G. Ashman, C. N. Booth, F. Combley, M. Dinsdale,J. Martin,D. Parker, L. F. Thompson,S. Brandt,H. Burkhardt, C. Grupen, H. Meinhard,E. Neugebauer,U. Schäfer, H. Seywerd, G. Apollinari,G. Giannini,B. Gobbo, F. Liello,E. Milotti,L. Rolandi, L. Bellantoni, J. F. Boudreau, D. Cinabro,J. S. Conway,D. F. Cowen, A. J. DeWeerd, Z. Feng, D. P. S. Ferguson,Y. S. Gao, J. L. Harton, J. Hilgart, J. E. Jacobsen,R. C. Jared,R. P. Johnson, B. W. LeClaire, Y. B. Pan,T. Parker, J. R. Pater,Y. Saadi,V. Sharma, J. A. Wear,F. V. Weber,Sau Lan Wu, G. Zobernig

Zeitschrift für Physik C Particles and Fields（1990）

引用 16|浏览12

暂无评分

摘要

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, Γ Z =(2497±31) MeV, σ had 0 =(41.86±0.66)nb, and for the partial widths Γinv=(489±24) MeV, Γhad(1754±27) MeV, Γ ee =(85.0±1.6)MeV, Γ μμ =(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,g v 2 (M Z 2 )=(0.12±0.12)×10−2 andg A 2 (M Z 2 )=0.2528±0.0040. The number of light neutrino species isNν=2.91±0.13; the electroweak mixing angle is sin2θW(M Z 2 )=0.2291±0.0040.

查看译文

关键词

Weak Coupling, Storage Ring, Partial Width, Light Neutrino, Leptonic Decay

AI 理解论文

溯源树

样例

生成溯源树，研究论文发展脉络

Chat Paper

正在生成论文摘要