Determination of the $e^+ e^- \to \gamma \gamma(\gamma)$ cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV - Archive ouverte HAL Access content directly
Journal Articles Physics Letters B Year : 2000

Determination of the $e^+ e^- \to \gamma \gamma(\gamma)$ cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV

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P. Abreu
  • Function : Author
W. Adam
  • Function : Author
T. Adye
  • Function : Author
P. Adzic
  • Function : Author
Z. Albrecht
  • Function : Author
T. Alderweireld
  • Function : Author
G D. Alekseev
  • Function : Author
R. Alemany
  • Function : Author
T. Allmendinger
  • Function : Author
P P. Allport
  • Function : Author
S. Almehed
  • Function : Author
U. Amaldi
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N. Amapane
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S. Amato
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E G. Anassontzis
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P. Andersson
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A. Andreazza
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S. Andringa
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P. Antilogus
W D. Apel
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B. Asman
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A. Augustinus
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P. Baillon
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A. Ballestrero
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Abstract

A test of the QED process \eeintogg(\fot) is reported. The data analysed were collected with the DELPHI detector in 1998 and 1999 at the highest ener\-gies achieved at LEP, reaching 202 GeV in the centre-of-mass. The total integrated luminosity amounts to 375.7 pb$^{-1}$. The differential and total cross-sections for the process $e^+e^- \to \gamma \gamma$ were measured, and found to be in agreement with the QED prediction. 95\% Confidence Level (C.L.) lower limits on the QED cut-off parameters of $\rm \Lambda_+ $ 330 GeV and $\rm \Lambda_{-}>$ 320 GeV were derived. A 95\% C.L. lower bound on the mass of an excited electron of 311 $\rm GeV/c^2$ (for $\lambda_{\gamma}$ =1) was obtained. s-channel virtual graviton exchange was searched for, resulting in 95\% C.L. lower limits on the string mass scale, $\rm M_S$: $\rm M_S 713 \, GeV/c^2$ ( $\lambda=1$) and $\rm M_S 691 \,GeV/c^2$ ($\lambda = -1$).
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in2p3-00006140 , version 1 (27-10-2000)

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P. Abreu, W. Adam, T. Adye, P. Adzic, Z. Albrecht, et al.. Determination of the $e^+ e^- \to \gamma \gamma(\gamma)$ cross-section at centre-of-mass energies ranging from 189 GeV to 202 GeV. Physics Letters B, 2000, 491, pp.67-80. ⟨10.1016/S0370-2693(00)01013-3⟩. ⟨in2p3-00006140⟩
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