Phys. Rev. D 34, 3286–3303 (1986)Experimental study of the reactions e+e-→e+e- and e+e-→γγ at 29 GeVReceived 12 May 1986; published in the issue dated 1 December 1986 This paper reports measurements of the differential cross sections for the reactions e+e-→e+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. © 1986 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevD.34.3286
DOI:
10.1103/PhysRevD.34.3286
PACS:
13.10.+q, 12.20.Fv
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