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

L3 Collaboration

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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 γγ → 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.

Original languageEnglish
Pages (from-to)53-62
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume585
Issue number1-2
DOIs
Publication statusPublished - Apr 8 2004

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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