https://doi.org/10.1140/epjc/s10052-006-0156-8
Regular Article - Experimental Physics
Fermion pair production in e+e- collisions at 189–209 GeV and constraints on physics beyond the standard model
1
Physikalisches Institut, RWTH-Aachen, 52056, Aachen, Germany
2
Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, 74019, Annecy-le-Vieux Cedex, France
3
Institut de Física d’Altes Energies, Universitat Autònoma de Barcelona, 08193, Bellaterra (Barcelona), Spain
4
Dipartimento di Fisica, INFN Sezione di Bari, 70126, Bari, Italy
5
Institute of High Energy Physics, Academia Sinica, Beijing, P.R. China
6
European Laboratory for Particle Physics (CERN), 1211, Geneva 23, Switzerland
7
Laboratoire de Physique Corpusculaire, Université Blaise Pascal, IN2P3-CNRS, Clermont-Ferrand, 63177, Aubière, France
8
Niels Bohr Institute, 2100, Copenhagen, Denmark
9
Nuclear Research Center Demokritos (NRCD), 15310, Attiki, Greece
10
Laboratoire Leprince-Ringuet, Ecole Polytechnique, IN2P3-CNRS, 91128, Palaiseau Cedex, France
11
Dipartimento di Fisica, Università di Firenze, INFN Sezione di Firenze, 50125, Firenze, Italy
12
Laboratori Nazionali dell’INFN (LNF-INFN), 00044, Frascati, Italy
13
Department of Physics and Astronomy, University of Glasgow, Glasgow, G12 8QQ, UK
14
Utah Valley State College, Orem, UT, 84058, USA
15
Kirchhoff-Institut für Physik, Universität Heidelberg, 69120, Heidelberg, Germany
16
Department of Physics, Imperial College, London, SW7 2BZ, UK
17
Institut für Experimentalphysik, Universität Innsbruck, 6020, Innsbruck, Austria
18
Department of Physics, University of Lancaster, Lancaster, LA1 4YB, UK
19
Institut de Physique Nucléaire, Département de Physique, Université Catholique de Louvain, 1348, Louvain-la-Neuve, Belgium
20
Institut für Physik, Universität Mainz, 55099, Mainz, Germany
21
Centre de Physique des Particules de Marseille, Univ Méditerranée, IN2P3-CNRS, 13288, Marseille, France
22
Dipartimento di Fisica, Università di Milano e INFN Sezione di Milano, 20133, Milano, Italy
23
Werner-Heisenberg-Institut, Max-Planck-Institut für Physik, 80805, München, Germany
24
Laboratoire de l’Accélérateur Linéaire, Université de Paris-Sud, IN2P3-CNRS, 91898, Orsay Cedex, France
25
Dipartimento di Fisica, Università, INFN Sezione di Pisa, e Scuola Normale Superiore, 56010, Pisa, Italy
26
Department of Physics, Royal Holloway and Bedford New College, University of London, Egham, Surrey, TW20 OEX, UK
27
Particle Physics Dept., Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 OQX, UK
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CEA, DAPNIA/Service de Physique des Particules, CE-Saclay, 91191, Gif-sur-Yvette Cedex, France
29
Institute for Particle Physics, University of California at Santa Cruz, Santa Cruz, CA, 95064, USA
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Department of Physics, University of Sheffield, Sheffield, S3 7RH, UK
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Fachbereich Physik, Universität Siegen, 57068, Siegen, Germany
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Dipartimento di Fisica, Università di Trieste e INFN Sezione di Trieste, 34127, Trieste, Italy
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Experimental Elementary Particle Physics, University of Washington, Seattle, WA, 98195, USA
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Department of Physics, University of Wisconsin, Madison, WI, 53706, USA
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Institute for Particle Physics, ETH Hönggerberg, 8093, Zürich, Switzerland
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CERN, 1211, Geneva 23, Switzerland
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Fermilab, PO Box 500, MS 352, Batavia, IL, 60510, USA
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Dipartimento di Fisica di Catania and INFN Sezione di Catania, 95129, Catania, Italy
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Department of Physics, University of Florida, Gainesville, FL, 32611-8440, USA
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IFSI sezione di Torino, INAF, Torino, Italy
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Groupe d’Astroparticules de Montpellier, Université de Montpellier II, 34095, Montpellier, France
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Departement de Physique Corpusculaire, Université de Genève, 1211, Genève 4, Switzerland
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Department of Physics, Tsinghua University, Beijing, P.R. China
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Universitat de Barcelona, 08208, Barcelona, Spain
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SAP AG, 69185, Walldorf, Germany
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Groupe d’ Astroparticules de Montpellier, Université de Montpellier II, 34095, Montpellier, France
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BNP Paribas, 60325, Frankfurt am Main, Germany
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Institut Inter-universitaire des hautes Energies (IIHE), Université Libre de Bruxelles, CP 230, 1050, Bruxelles, Belgium
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Dipartimento di Fisica e Tecnologie Relative, Università di Palermo, Palermo, Italy
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SLAC, Stanford, CA, 94309, USA
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CERN, 1211, Geneva 23, Switzerland
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Liverpool University, Liverpool, L69 7ZE, UK
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Institut für Experimentelle Kernphysik, Universität Karlsruhe, Karlsruhe, Germany
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Henryk Niewodnicznski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland
* e-mail: Roberto.Tenchini@cern.ch
Received:
9
June
2006
Revised:
11
September
2006
Published online:
2
December
2006
Cross sections, angular distributions and forward-backward asymmetries are presented, of two-fermion events produced in e+e- collisions at centre-of-mass energies from 189 to 209 GeV at LEP, measured with the ALEPH detector. Results for e+e-, μ+μ-, τ+τ-, qq̄, bb̄ and cc̄ production are in agreement with the standard model predictions. Constraints are set on scenarios of new physics such as four-fermion contact interactions, leptoquarks, Z′ bosons, TeV-scale quantum gravity and R-parity violating squarks and sneutrinos.
© Springer-Verlag Berlin Heidelberg, 2007