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Muon-pair and tau-pair production in two-photon collisions at LEP

Document type: Articulo

Abstract

The QED processes e+e− → e+e−μ+μ− and e+e− → e+e−τ+τ− are studied with the L3 detector at LEP using an untagged data sample collected at centre-of-mass energies 161 GeV ≤ √s 209 GeV. The τ -pairs are observed through the associated decay of one τ into eνν and the other into ππν. The cross sections are measured as a function of √s. For muon pairs, the cross section of the γ γ → μ+μ− process is also measured as a function of the two-photon centre-of-mass energy for 3 GeV ≤ Wγγ 40 GeV. Good agreement is found between these measurements and the O(α4) QED expectations. In addition, limits on the anomalous magnetic and electric dipole moments of the τ lepton are extracted.

General information

Issue date: 8 de abril de 2004
Document language: English
Journal: Physics Letters B; vol. 585, no. 1-2
Origin: Facultad de Ciencias Exactas
ISSN: 0370-2693
Pages: 53-62
xmlui.dri2xhtml.METS-1.0.item-dc-subject: Fotones ; L3 detector ; large electron positron collider
Subjects: Ciencias Exactas ; Física

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Created: 27 de agosto de 2019
Available since: 27 de agosto de 2019
Please, use one of this identificators(URI) for cite o linking this item:
  • http://sedici.unlp.edu.ar/handle/10915/79918
  • https://doi.org/10.1016/j.physletb.2004.02.012

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    Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) Except where otherwise noted, this item's license is described as Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)