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Article
Report number hep-ex/9803020 ; CERN-EP-98-033 ; CERN-EP-98-033
Title An upper limit on the anomalous magnetic moment of the τ lepton
Author(s) OPAL Collaboration  Pokaż wszystkich 340 autorów
Affiliation (School of Physics and Astronomy, Univ. Birmingham) ; (Dipartimento di Fisica dell' Univ. di Bologna and INFN, Bologna) ; (Physikalisches Institut, Univ. Bonn) ; (Department of Physics, Univ. California, Riverside) ; (Cavendish Laboratory, Cambridge) ; (Ottawa-Carleton Institute for Physics, Univ. Carleton, Carleton) ; (Centre for Research in Particle Physics, Univ. Carleton, Carleton) ; (CERN) ; (Enrico Fermi Institute, Chicago) ; (Fakultät für Physik, Albert Ludwigs Univ., Freiburg) ; (Physikalisches Inst., Univ. Heidelberg, Heidelberg) ; (Department of Physics, Indiana Univ., Blooming) ; (Queen Mary and Westfield College, Univ. of London, London) ; (Technische Hochschule Aachen, III Physikalisches Inst., Aachen) ; (Univ. College London, London) ; (Department of Physics, Schuster Laboratory, Manchester) ; (Department of Physics, Univ. Maryland, College Park) ; (Lab. de Physique Nucl., Univ. Montreal, Montreal) ; (Department of Physics, Univ. Oregon, Eugene) ; (Rutherford Appleton Lab., Chilton, Didcot) ; (Department of Physics, Technion-Israel Inst. of Technology, Haifa) ; (Department of Physics and Astronomy, Tel Aviv Univ., Tel Aviv) ; (Int. Centre for Elementary Part. Phys. and Depart. of Phys., Univ. Tokyo, Tokyo) ; (Kobe University, Kobe) ; (Brunel University, Uxbridge) ; (Particle Physics Depart., Weizmann Institute of Science, Rehovot) ; (Univ. Hamburg/DESY, II Institut für Experimental Physik, Hamburg) ; (Univ. Victoria, Department of Physics, Victoria) ; (Univ. British Columbia, Department of Physics, Vancouver) ; (Univ. Alberta, Department of Physics, Edmonton) ; (Duke Univ., Dept of Physics, Durham) ; (Research Inst. for Particle and Nuclear Physics, Budapest) ; (Inst. of Nuclear Research, Debrecen) ; (Ludwigs-Maximilians-Univ., München)
Publication 1998
Imprint 2 Mar 1998
Number of pages 19
Note 20 pages, LaTeX, uses a4p.sty, 4 eps figures included, submitted to Phys. Lett. B Report-no: CERN-EP/98-03
In: Phys. Lett. B 431 (1998) 188
DOI 10.1016/S0370-2693(98)00520-6
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract Using radiative Z^0 -> \tau^+ \tau^- \gamma events collected with the OPAL detector at LEP at \sqrt{s}= M_Z during 1990-95, a direct study of the electromagnetic current at the \tau\gamma vertex has been performed in terms of the anomalous magnetic form factor F_2 of the \tau lepton. The analysis is based on a data sample of 1429 e^+ e^- -> \tau^+ \tau^- \gamma events which are examined for a deviation from the expectation with F_2 = 0. From the non-observation of anomalous \tau^+ \tau^- \gamma production a limit of -0.068 < F_2 < 0.065 is obtained. This can also be interpreted as a limit on the electric dipole form factor F_3 as -3.8 x 10^-16 e-cm < eF_3 < 3.6 x 10^-16 e-cm. The above ranges are valid at the 95% confidence level.
Copyright/License Elsevier Science B.V.

Corresponding record in: Inspire
Email contact: rickv@hpopi1.cern.ch


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