Measurement of the e(+)e(-)->gamma gamma(gamma) cross section at the LEP energies
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 p...
Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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Format: | Journal article |
Language: | English |
Published: |
1998
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Summary: | 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. © 1998 Published by Elsevier Science B.V. All rights reserved. |
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