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Experimental study of the reactions e(+)e(-)→e(+)e(-) and e(+)e(-)→γγ at 29 GeV
Baringer, Philip S. Derrick, M. Gan, K. K. Kooijman, P. Loos, J. S. Musgrave, B. Price, L. E. Schlereth, J. Sugano, K. Weiss, J. M.
Baringer, Philip S.
Derrick, M.
Gan, K. K.
Kooijman, P.
Loos, J. S.
Musgrave, B.
Price, L. E.
Schlereth, J.
Sugano, K.
Weiss, J. M.
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Abstract
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 α(3). When the ratio of γ-pair to Bhabha experimental cross sections, integrated over ‖costheta‖<0.55, is divided by the same ratio predicted from α(3) 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.
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This is the publisher's version, also available electronically from http://journals.aps.org/prd/abstract/10.1103/PhysRevD.34.3286.
Date
1986-12-01
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American Physical Society
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Baringer, Philip S. et al. (1986). "Experimental study of the reactions e(+)e(-)→e(+)e(-) and e(+)e(-)→γγ at 29 GeV." Physical Review D, 1986(34):3286. http://dx.doi.org/10.1103/PhysRevD.34.3286