Experimental study of the reactions e+ee+e and e+e→γγ at 29 GeV

M. Derrick et al.
Phys. Rev. D 34, 3286 – Published 1 December 1986
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Abstract

This paper reports measurements of the differential cross sections for the reactions e+ee+e (Bhabha scattering) and e+e→γγ (γ-pair production). The reactions are studied at a center-of-mass energy of 29 GeV and in the polar-angular region ‖costheta‖<0.55. A direct cross-section comparison between these two reactions provides a sensitive test of the predictions of quantum electrodynamics (QED) to order α3. When the ratio of γ-pair to Bhabha experimental cross sections, integrated over ‖costheta‖<0.55, is divided by the same ratio predicted from α3 QED theory, the result is 1.007±0.009±0.008. The 95%-confidence limits on the QED-cutoff parameters are Λ+>154 GeV and Λ>220 GeV for Bhabha scattering, and Λ+>59 GeV and Λ>59 GeV for γ-pair production.

  • Received 12 May 1986

DOI:https://doi.org/10.1103/PhysRevD.34.3286

©1986 American Physical Society

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Vol. 34, Iss. 11 — 1 December 1986

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