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

GASPARINI, UGO;MARGONI, MARTINO;RONCHESE, PAOLO;SIMONETTO, FRANCO;ZUMERLE, GIANNI
1998

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.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/2500193
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 15
  • ???jsp.display-item.citation.isi??? 18
social impact