Measurement of the e+ e- ---> gamma gamma (gamma) cross-section at the LEP energies

Abreu, P.;Cortina Gil, Eduardo;DELPHI Collaboration;et.al.
(1998) Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 433, n° 3-4, p. 429-440 (1998)

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The total and the differential cross-sections for the reaction e+e−→γγ(γ) have been measured with the DELPHI detector at LEP at centre-of-mass energies from 130 to 183 GeV for an integrated luminosity of 78.19 pb−1. The results agree with the QED predictions. The lower limits (obtained including previously published results at the Z0 energies) on the QED cutoff parameters are Λ+>253 GeV and Λ−>225 GeV and the lower bound on the mass of an excited electron with an effective coupling constant λγ=1 is 231 GeV/c2. All the limits are at the 95% confidence level.
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Abreu, P., Cortina Gil, E., DELPHI Collaboration, & et al. (1998). Measurement of the e+ e- ---> gamma gamma (gamma) cross-section at the LEP energies. Physics Letters. Section B: Nuclear, Elementary Particle and High-Energy Physics, 433(3-4), 429-440. https://doi.org/10.1016/S0370-2693(98)00715-1 (Original work published 1998)