The total and the differential cross-sections for the reaction e(+)e(-) --> gamma gamma(gamma) 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 Lambda(+) > 253 GeV and Lambda(-) > 225 GeV and the lower bound on the mass of an excited electron with an effective coupling constant lambda(gamma) = 1 is 231 GeV/c(2). All the Limits are at the 95% confidence level. (C) 1998 Published by Elsevier Science B.V. All rights reserved.

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

BIANCHI, Fabrizio;MIGLIORE, Ernesto;ROMERO, Alessandra;
1998-01-01

Abstract

The total and the differential cross-sections for the reaction e(+)e(-) --> gamma gamma(gamma) 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 Lambda(+) > 253 GeV and Lambda(-) > 225 GeV and the lower bound on the mass of an excited electron with an effective coupling constant lambda(gamma) = 1 is 231 GeV/c(2). All the Limits are at the 95% confidence level. (C) 1998 Published by Elsevier Science B.V. All rights reserved.
1998
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P. Abreu;W. Adam;T. Adye;P. Adzic;G. D. Alekseev;R. Alemany;P. P. Allport;S. Almehed;U. Amaldi;S. Amato;P. Andersson;A. Andreazza;P. Anti...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/103920
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