Tests of QED at LEP energies using e+e- →γγ(γ) and e+e-→ ℓ+γγ

Acciarri, M. ; Adam, A. ; Adriani, O. ; Aguilar-Benitez, M. ; Gurtu, A. ; et., al (1995) Tests of QED at LEP energies using e+e- →γγ(γ) and e+e-→ ℓ+γγ Physics Letters B, 353 (1). pp. 136-144. ISSN 0370-2693

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Official URL: http://www.sciencedirect.com/science/article/pii/0...

Related URL: http://dx.doi.org/10.1016/0370-2693(95)00527-R


Total and differential cross sections for the process e+e → γγ(γ), and the total cross section for the process e+e → γγγ, are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Λ > 602 GeV, on the mass of an excited electron me* > 146 and on the QED cut-off parameters Λ+ > 149 GeV and Λ_ > 143 GeV. Upper limits are also set o branching fractions of Z decaying into γγ, π° and ηγ of 5.2 × 10−5, 5.2 × 10−5 and 7.6 × 10−5 respectively. The reactions e+e → ℓ+nγ (ℓ = e, μ, τ) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.

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