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

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett.B 433 (1998) 429-440, 1998.
Inspire Record 472952 DOI 10.17182/hepdata.49434

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 Z 0 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 λ γ =1 is 231 GeV/ c 2 . All the limits are at the 95% confidence level.

5 data tables
Table 1

The cross section of the previously published data (sqrt(s)=91.25 GeV, see PL 327B, 386) is given at the mean of the CM energies weighted by the luminosityat each point.

Table 2

Statistical errors only. Additional overall systematic uncertainty is givenabove.

Table 3

Statistical errors only. Additional overall systematic uncertainty is givenabove.

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