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Measurements of the lineshape of the Z0 and determination of electroweak parameters from its hadronic and leptonic decays

  • P. Abreu
  • , W. Adam
  • , T. Adye
  • , E. Agasi
  • , R. Aleksan
  • , G. D. Alekseev
  • , P. Allport
  • , S. Almehed
  • , F. M.L. Almeida Junior
  • , S. J. Alvsvaag
  • , U. Amaldi
  • , A. Andreazza
  • , P. Antilogus
  • , W. D. Apel
  • , R. J. Apsimon
  • , Y. Arnoud
  • , B. Åsman
  • , J. E. Augustin
  • , A. Augustinus
  • , P. Baillon
  • P. Bambade, F. Barao, R. Barate, G. Barbiellini, D. Y. bardin, G. J. Barker, A. Baroncelli, O. Barring, J. A. Barrio, W. Bartl, M. J. Bates, M. Battaglia, M. Baubillier, K. H. Becks, M. Begalli, P. Beilliere, Yu Belokopytov, P. Beltran, A. C. Benvenuti, M. Berggren, D. Bertrand, F. Bianchi, M. Bigi, M. S. 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. Bruckman, J. M. Brunet, A. Budziak, L. Bugge, T. Buran, A. Buys, J. A.M.A. 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, R. Cases, C. Caso, M. V. Castillo Gimenez, A. Cattai, F. R. Cavallo, L. Cerrito, V. Chabaud, A. Chan, Ph Charpentier, J. Chauveau, P. Checchia, G. A. Chelkov, L. Chevalier, P. 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. Crennell, G. Crosetti, J. Cuevas Maestro, S. Czellar, E. Dahl-Jensen, J. Dahm, B. Dalmagne, M. Dam, G. Damgaard, E. Daubie, A. Daum, P. D. Dauncey, M. Davenport, J. Davies, W. Da Silva, C. Defoix, P. Delpierre, N. Demaria, A. De Angelis, H. De Boeck, W. De Boer, S. De Brabandere, C. De Clercq, M. D.M. De Fez Laso, C. De La Vaissiere, B. De Lotto, A. De Min, L. De Paula, H. Dijkstra, L. Di Ciaccio, F. Djama, J. Dolbeau, M. Donszelmann, K. Doroba, M. Dracos, J. Drees, M. Dris, Y. Dufour, F. Dupont, D. Edsall, L. O. Eek, R. Ehret, T. Ekelof, G. Ekspong, A. Elliot Peisert, M. Elsing, J. P. Engel, N. Ershaidat, M. Espirito Santo, V. Falaleev, D. Fassouliotis, M. Feindt, A. Ferrer, T. A. Filippas, A. Firestone, H. Foeth, E. Fokitis, F. Fontanelli, K. A.J. Forbes, F. Formenti, J. L. Fousset, S. Francon, B. Franek, P. Frenkiel, D. C. Fries, A. G. Frodesen, R. Fruhwirth, F. Fulda-Quenzer, H. Furstenau, J. Fuster, D. Gamba, M. Gandelman, C. Garcia, J. Garcia, C. Gaspar, U. Gasparini, Ph Gavillet, E. N. Gazis, J. P. Gerber, P. Giacomelli, D. Gillespie, R. Gokieli, B. Golob, V. M. Golovatyuk, J. J. Gomez Y Cadenas, G. Gopal, L. Gorn, M. Gorski, V. Gracco, F. Grard, E. Graziani, G. Grosdidier, B. Grossetete, 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. Henriques, J. J. Hernandez, J. A. Hernando, P. Herquet, H. Herr, T. L. Hessing, C. O. Higgins, E. Higon, H. J. Hilke, T. S. Hill, S. D. Hodgson, T. Hofmokl, S. O. Holmgren, P. J. Holt, D. Holthuizen, P. F. Honore, M. Houlden, J. 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. Jonsson, P. Juillot, M. Kaiser, G. Kalkanis, G. Kalmus, F. Kapusta, M. Karlsson, E. Karvelas, S. Katsanevas, E. C. Katsoufis, R. Keranen, B. A. Khomenko, N. N. Khovanski, B. King, N. J. Kjaer, H. Klein, A. Klovning, P. Kluit, A. Koch-Mehrin, J. H. Koehne, B. Koene, P. Kokkinias, M. Koratzinos, A. V. Korytov, V. Kostioukhine, C. Kourkoumelis, O. Kouznetsov, P. H. Kramer, M. Krammer, C. Kreuter, J. Krolikowski, I. Kronkvist, W. Kucewicz, K. Kulka, K. Kurvinen, C. Lacasta, C. Lambropoulos, J. W. Lamsa, L. Lanceri, P. Langefeld, V. Lapin, I. Last, J. P. Laugier, R. Lauhakangas, G. Leder, F. Ledroit, R. Leitner, Y. Lemoigne, J. Lemonne, G. Lenzen, V. Lepeltier, J. M. Levy, E. Lieb, R. Lindner, A. Lipniacka, I. Lippi, B. Loerstad, M. Lokajicek, J. G. Loken, A. Lopez-Fernandez, M. A. Lopez Aguera, M. Los, D. Loukas, J. J. Lozano, P. Lutz, L. Lyons, G. Maehlum, J. Maillard, A. Maio, A. Maltezos, F. Mandl, J. Marco, B. Marechal, M. Margoni, J. C. Marin, C. Mariotti, A. Markou, T. Maron, S. Marti, C. Martinez-Rivero, F. Martinez-Vidal, F. Matorras, C. Matteuzzi, G. Matthiae, M. Mazzucato, M. Mc Cubbin, R. Mc Kay, R. Mc Nulty, J. Medbo, C. Meroni, W. T. Meyer, M. Michelotto, E. Migliore, I. Mikulec, L. Mirabito, W. A. Mitaroff, G. V. Mitselmakher, U. Mjoernmark, T. Moa, R. Moeller, K. Moenig, M. R. Monge, P. Morettini, H. Mueller, W. J. Murray, B. Muryn, G. Myatt, F. Naraghi, F. L. Navarria, P. Negri, S. Nemecek, W. Neumann, N. Neumeister, R. Nicolaidou, B. S. Nielsen, V. Nikolaenko, P. E.S. Nilsen, P. Niss, A. Nomerotski, V. Obraztsov, A. G. Olshevski, R. Orava, A. Ostankov, K. Osterberg, A. Ouraou, P. Paganini, M. Paganoni, R. Pain, H. Palka, Th D. Papadopoulou, L. Pape, F. Parodi, A. Passeri, M. Pegoraro, J. Pennanen, L. Peralta, H. Pernegger, M. 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. Pozdniakov, M. Prest, P. Privitera, A. Pullia, D. Radojicic, S. Ragazzi, H. Rahmani, J. Rames, P. N. Ratoff, A. L. Read, M. Reale, P. Rebecchi, N. G. Redaelli, M. Regler, D. Reid, P. B. Renton, L. K. Resvanis, F. Richard, J. Richardson, J. Ridky, G. Rinaudo, A. Romero, I. Roncagliolo, P. Ronchese, E. I. Rosenberg, E. Rosso, P. Roudeau, T. Rovelli, W. Ruckstuhl, V. Ruhlmann-Kleider, A. Ruiz, K. Rybicki, H. Saarikko, Y. Sacquin, G. Sajot, J. Salt, J. Sanchez, M. Sannino, S. Schael, H. Schneider, M. A.E. Schyns, G. Sciolla, F. Scuri, A. M. Segar, A. Seitz, R. Sekulin, M. Sessa, R. Seufert, R. C. Shellard, I. Siccama, P. Siegrist, S. Simonetti, F. Simonetto, A. N. Sisakian, G. Skjevling, G. Smadja, N. Smirnov, O. Smirnova, G. R. Smith, R. Sosnowski, D. Souza-Santos, T. Spassov, E. Spiriti, S. Squarcia, H. Staeck, C. Stanescu, S. Stapnes, G. Stavropoulos, F. Stichelbaut, A. Stocchi, J. Strauss, J. Straver, R. Strub, B. Stugu, M. Szczekowski, M. Szeptycka, P. Szymanski, T. Tabarelli, O. Tchikilev, G. E. Theodosiou, Z. Thome, A. Tilquin, J. Timmermans, V. G. Timofeev, L. G. Tkatchev, T. Todorov, D. Z. Toet, A. Tomaradze, B. Tome, E. Torassa, L. Tortora, D. Treille, W. Trischuk, G. Tristram, C. Troncon, A. Tsirou, E. N. Tsyganov, M. Turala, M. L. Turluer, T. Tuuva, I. A. Tyapkin, M. Tyndel, S. Tzamarias, B. Ueberschaer, S. Ueberschaer, O. Ullaland, V. Uvarov, G. Valenti, E. Vallazza, J. A. Valls Ferrer, C. Vander 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. 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, P. Weilhammer, A. M. Wetherell, J. H. Wickens, M. Wielers, G. R. Wilkinson, W. S.C. Williams, M. Winter, G. Wormser, K. Woschnagg, A. Zaitsev, A. Zalewska, L. Zanini, D. Zavrtanik, E. Zevgolatakos, N. I. Zimin, M. Zito, D. Zontar, R. Zuberi, G. Zumerle
  • Faculdade de Ciências, Universidade de Lisboa
  • European Organization for Nuclear Research
  • CCLRC Rutherford Appleton Laboratory
  • Science Park 105
  • Institut Pierre Simon Laplace, CNRS and CEA
  • Joint Institute for Nuclear Research, Dubna
  • University of Liverpool
  • Lund University
  • Instituto de Biofisica da UFRJ
  • University of Bergen
  • University of Milano
  • IGFL, Université de Lyon, Université Lyon 1
  • Universität Karlsruhe/Forschungszentrum Karlsruhe
  • Stockholm University
  • Université Paris-Saclay
  • Université Paris-Sud
  • University of Trieste
  • and Physics University of Udine
  • University of Oxford
  • Sezione di Roma
  • Complutense University
  • Institut für Hochenergiephysik
  • University of Helsinki
  • Universités Paris VI and VII
  • Bergische Universität Gesamthochschule Wuppertal
  • Pontifícia Universidade Católica do Rio de Janeiro
  • Kurchatov Institute
  • Institute of Nuclear Physics Demokritos
  • University of Bologna
  • University of Antwerp
  • Inter-University Institute for High Energies ULB-VUB
  • Université de Mons
  • University of Turin
  • Centre de Recherches Nucléaires
  • University of Warsaw
  • University of Ljubljana
  • Uppsala University
  • University of Genoa
  • University of Padova
  • Institute for Nuclear Physics
  • University of Oslo
  • CSIC-Univ. Cantabria
  • University of Rome “Tor Vergata”
  • CSIC-UV - Instituto de Física Corpuscular (IFIC)
  • Ames Laboratory
  • University of Oviedo
  • Niels Bohr Institutet
  • Aix Marseille Université
  • National Technical University of Athens
  • Centro Brasileiro de Pesquisas Fisicas
  • University of Athens
  • Charles University
  • Institute of Physics of the Czech Academy of Sciences
  • Lancaster University

Résultats de recherche: Contribution à un journalArticleRevue par des pairs

Résumé

During the LEP running periods in 1990 and 1991 DELPHI has accumulated approximately 450 000 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 MZ = 91.187 ± 0.009 GeV, ΓZ = 2.486 ± 0.012 GeV, the hadronicf and leptonic partials widths Γhad = 1.725 ± 0.012 GeV, Γ = 83.01 ± 0.52 MeV, the invisible width Γinv = 512 ± 10 MeV, the ratio of hadronic to leptonic partial widths R = 20.78 ± 0.15, and the Born level hadronic peak cross section σ0 = 40.90 ± 0.28 nb. Using these results and the value of αs 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: Γe = 82.93 ± 0.70 MeV, Γμ = 83.20 ± 1.11 MeV and Γτ = 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 gVℓ 2 = (1.47 ± 0.51) × 10-3 and gAℓ 2 = 0.2483 ± 0.0016. A full Standard Model fit to the data yields a value of the top mass mt = 115-82 +52 (expt.)-24 +52(Higgs) GeV, corresponding to a value of the weak mixing angle sin2 θeff lept = 0.2339±0.0015 (expt.)-0.0004 +0.0001 (Higgs). Values are obtained for the variables S and T, or ε{lunate}1 and ε{lunate}3 which parameterize electroweak loop effects.

langue originaleAnglais
Pages (de - à)3-57
Nombre de pages55
journalNuclear Physics B
Volume417
Numéro de publication1-2
Les DOIs
étatPublié - 11 avr. 1994
Modification externeOui

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