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Measurements of cross sections and forward-backward asymmetries at the Z resonance and determination of electroweak parameters

  • M. Acciarri
  • , P. Achard
  • , O. Adriani
  • , M. Aguilar-Benitez
  • , J. Alcaraz
  • , G. Alemanni
  • , J. Allaby
  • , A. Aloisio
  • , M. G. Alviggi
  • , G. Ambrosi
  • , H. Anderhub
  • , V. P. Andreev
  • , T. Angelescu
  • , F. Anselmo
  • , A. Arefiev
  • , T. Azemoon
  • , T. Aziz
  • , P. Bagnaia
  • , L. Baksay
  • , A. Balandras
  • R. C. Ball, S. Banerjee, S. W. Banerjee, A. Barczyk, R. Barillère, L. Barone, P. Bartalini, M. Basile, R. Battiston, A. Bay, F. Becattini, U. Becker, F. Behner, L. Bellucci, J. Berdugo, P. Berges, B. Bertucci, B. L. Betev, S. Bhattacharya, M. Biasini, A. Biland, J. J. Blaising, S. C. Blyth, G. J. Bobbink, A. Böhm, L. Boldizsar, B. Borgia, D. Bourilkov, M. Bourquin, S. Braccini, J. G. Branson, V. Brigljevic, F. Brochu, I. C. Brock, A. Buffini, A. Buijs, J. D. Burger, W. J. Burger, A. Button, X. D. Cai, M. Campanelli, M. Capell, G. Cara Romeo, G. Carlino, A. M. Cartacci, J. Casaus, G. Castellini, F. Cavallari, N. Cavallo, C. Cecchi, M. Cerrada, F. Cesaroni, M. Chamizo, Y. H. Chang, U. K. Chaturvedi, M. Chemarin, A. Chen, G. Chen, G. M. Chen, H. F. Chen, H. S. Chen, G. Chiefari, L. Cifarelli, F. Cindolo, C. Civinini, I. Clare, R. Clare, G. Coignet, A. P. Colijn, N. Colino, S. Costantini, F. Cotorobai, B. Cozzoni, B. de la Cruz, A. Csilling, S. Cucciarelli, T. S. Dai, J. A. van Dalen, R. D'Alessandro, R. de Asmundis, P. Déglon, A. Degré, K. Deiters, D. della Volpe, P. Denes, F. DeNotaristefani, A. De Salvo, M. Diemoz, D. van Dierendonck, F. Di Lodovico, C. Dionisi, M. Dittmar, A. Dominguez, A. Doria, M. T. Dova, D. Duchesneau, D. Dufournaud, P. Duinker, I. Duran, S. Dutta, H. El Mamouni, A. Engler, F. J. Eppling, F. C. Erné, P. Extermann, M. Fabre, R. Faccini, M. A. Falagan, S. Falciano, A. Favara, J. Fay, O. Fedin, M. Felcini, T. Ferguson, F. Ferroni, H. Fesefeldt, E. Fiandrini, J. H. Field, F. Filthaut, P. H. Fisher, I. Fisk, G. Forconi, L. Fredj, K. Freudenreich, C. Furetta, Y. Galaktionov, S. N. Ganguli, P. Garcia-Abia, M. Gataullin, S. S. Gau, S. Gentile, N. Gheordanescu, S. Giagu, Z. F. Gong, G. Grenier, O. Grimm, M. W. Gruenewald, M. Guida, R. van Gulik, V. K. Gupta, A. Gurtu, L. J. Gutay, D. Haas, A. Hasan, D. Hatzifotiadou, T. Hebbeker, A. Hervé, P. Hidas, J. Hirschfelder, H. Hofer, G. Holzner, H. Hoorani, S. R. Hou, I. Iashvili, V. Innocente, B. N. Jin, L. W. Jones, P. de Jong, I. Josa-Mutuberría, R. A. Khan, M. Kaur, M. N. Kienzle-Focacci, D. Kim, J. K. Kim, J. Kirkby, D. Kiss, W. Kittel, A. Klimentov, A. C. König, E. Koffeman, A. Kopp, V. Koutsenko, M. Kräber, R. W. Kraemer, W. Krenz, A. Krüger, H. Kuijten, A. Kunin, P. Ladron de Guevara, I. Laktineh, G. Landi, K. Lassila-Perini, M. Lebeau, A. Lebedev, P. Lebrun, P. Lecomte, P. Lecoq, P. Le Coultre, H. J. Lee, J. M. Le Goff, R. Leiste, E. Leonardi, P. Levtchenko, C. Li, S. Likhoded, C. H. Lin, W. T. Lin, F. L. Linde, L. Lista, Z. A. Liu, W. Lohmann, E. Longo, Y. S. Lu, W. Lu, K. Lübelsmeyer, C. Luci, D. Luckey, L. Lugnier, L. Luminari, W. Lustermann, W. G. Ma, M. Maity, L. Malgeri, A. Malinin, C. Maña, D. Mangeol, P. Marchesini, G. Marian, J. P. Martin, F. Marzano, G. G.G. Massaro, K. Mazumdar, R. R. McNeil, S. Mele, L. Merola, M. Merk, M. Meschini, W. J. Metzger, M. von der Mey, A. Mihul, H. Milcent, G. Mirabelli, J. Mnich, G. B. Mohanty, P. Molnar, B. Monteleoni, T. Moulik, G. S. Muanza, F. Muheim, A. J.M. Muijs, M. Musy, M. Napolitano, F. Nessi-Tedaldi, H. Newman, T. Niessen, A. Nisati, H. Nowak, G. Organtini, A. Oulianov, C. Palomares, D. Pandoulas, S. Paoletti, A. Paoloni, P. Paolucci, R. Paramatti, H. K. Park, I. H. Park, G. Pascale, G. Passaleva, S. Patricelli, T. Paul, M. Pauluzzi, C. Paus, F. Pauss, D. Peach, M. Pedace, S. Pensotti, D. Perret-Gallix, B. Petersen, D. Piccolo, F. Pierella, M. Pieri, P. A. Piroué, E. Pistolesi, V. Plyaskin, M. Pohl, V. Pojidaev, H. Postema, J. Pothier, N. Produit, D. O. Prokofiev, D. Prokofiev, J. Quartieri, G. Rahal-Callot, M. A. Rahaman, P. Raics, N. Raja, R. Ramelli, P. G. Rancoita, A. Raspereza, G. Raven, M. Rescigno, S. Reucroft, T. van Rhee, S. Riemann, K. Riles, A. Robohm, J. Rodin, B. P. Roe, L. Romero, A. Rosca, S. Rosier-Lees, S. Roth, J. A. Rubio, D. Ruschmeier, H. Rykaczewski, S. Saremi, S. Sarkar, J. Salicio, E. Sanchez, M. P. Sanders, M. E. Sarakinos, C. Schäfer, V. Schegelsky, S. Schmidt-Kaerst, D. Schmitz, H. Schopper, D. J. Schotanus, G. Schwering, C. Sciacca, D. Sciarrino, A. Seganti, L. Servoli, S. Shevchenko, N. Shivarov, V. Shoutko, E. Shumilov, A. Shvorob, T. Siedenburg, D. Son, B. Smith, P. Spillantini, M. Steuer, D. P. Stickland, A. Stone, H. Stone, B. Stoyanov, A. Straessner, K. Sudhakar, G. Sultanov, L. Z. Sun, H. Suter, J. D. Swain, Z. Szillasi, T. Sztaricskai, X. W. Tang, L. Tauscher, L. Taylor, B. Tellili, C. Timmermans, S. C.C. Ting, S. M. Ting, S. C. Tonwar, J. Tóth, C. Tully, K. L. Tung, J. Ulbricht, U. Uwer, E. Valente, G. Vesztergombi, I. Vetlitsky, D. Vicinanza, G. Viertel, S. Villa, M. Vivargent, S. Vlachos, I. Vodopianov, H. Vogel, H. Vogt, I. Vorobiev, A. A. Vorobyov, A. Vorvolakos, M. Wadhwa, W. Wallraff, M. Wang, X. L. Wang, Z. M. Wang, A. Weber, M. Weber, P. Wienemann, H. Wilkens, S. X. Wu, S. Wynhoff, L. Xia, Z. Z. Xu, B. Z. Yang, C. G. Yang, H. J. Yang, M. Yang, J. B. Ye, S. C. Yeh, J. M. You, A. Zalite, Y. Zalite, Z. P. Zhang, G. Y. Zhu, R. Y. Zhu, A. Zichichi, G. Zilizi, M. Zoller
  • National Institute for Nuclear Physics
  • University of Geneva
  • CIEMAT
  • University of Lausanne
  • CERN
  • Swiss Federal Institute of Technology Zurich
  • Louisiana State University
  • Nuclear Physics Institute
  • Institute of Atomic Physics and University of Bucharest
  • Alikhanov Institute for Theoretical and Experimental Physics
  • University of Michigan, Ann Arbor
  • Tata Institute of Fundamental Research
  • University of Rome La Sapienza
  • University of Alabama
  • IN2P3-CNRS
  • Paul Scherrer Institute
  • University of Perugia
  • Massachusetts Institute of Technology
  • Carnegie Mellon University
  • University of Amsterdam
  • RWTH Aachen University
  • Hungarian Academy of Sciences
  • University of California at San Diego
  • Utrecht University
  • University of Basilicata
  • University of Salento
  • National Central University
  • ICSC - World Laboratory
  • Universite Claude Bernard Lyon 1
  • CAS - Institute of High Energy Physics
  • University of Science and Technology of China
  • University of Salerno
  • University of Basel
  • Radboud University Nijmegen
  • Princeton University
  • University of Santiago de Compostela
  • California Institute of Technology
  • Northeastern University
  • Humboldt University of Berlin
  • Purdue University
  • University of Cyprus
  • Kyungpook National University
  • German Electron Synchrotron
  • University of Debrecen
  • University of Helsinki
  • University of Hamburg
  • Bulgarian Academy of Sciences
  • National Tsing Hua University

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

We report on measurements of hadronic and leptonic cross sections and leptonic forward-backward asymmetries performed with the L3 detector in the years 1993-95. A total luminosity of 103 pb-1 was collected at centre-of-mass energies √s ≈ mz and √s ≈ mz±1.8 GeV which corresponds to 2.5 million hadronic and 245 thousand leptonic events selected. These data lead to a significantly improved determination of Z parameters. From the total cross sections, combined with our measurements in 1990-92, we obtain the final results: mz = 91 189.8 ± 3.1 MeV , Γz = 2 502.4 ± 4.2 MeV , Γhad = 1 751.1 ± 3.8 MeV , Γ = 84.14 ± 0.17 MeV . An invisible width of Γinv = 499.1 ± 2.9 MeV is derived which in the Standard Model yields for the number of light neutrino species Nv = 2.978 ± 0.014. Adding our results on the leptonic forward-backward asymmetries and the tau polarisation, the effective vector and axial-vector coupling constants of the neutral weak current to charged leptons are determined to be ḡV = -0.0397 ± 0.0017 and ḡA = -0.50153 ± 0.00053. Including our measurements of the Z → bb̄ forward-backward and quark charge asymmetries a value for the effective electroweak mixing angle of sin2θ̄w = 0.23093 ± 0.00066 is derived. All these measurements are in good agreement with the Standard Model of electroweak interactions. Using all our measurements of electroweak observables an upper limit on the mass of the Standard Model Higgs boson of mH < 133 GeV is set at 95% confidence level.

Original languageEnglish
Pages (from-to)1-40
Number of pages40
JournalEuropean Physical Journal C
Volume16
Issue number1
DOIs
StatePublished - 2000

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