Comparison of electron-proton and positron-proton elastic scattering at four-momentum transfers up to 5.0 (GeV/c)^2

Creators: Mar, Jerry; Barish, Barry C.; Pine, Jerome; Coward, David H.; DeStaebler, H.; Litt, J.; Minten, A.; Taylor, Richard E.; Breidenbach, M.

Abstract

Measurements of the ratio (R) of positron-proton and electron-proton elastic-scattering cross sections have been made, with the square of the four-momentum transfer (q^2) equal to 0.20, 0.69, 0.73, 1.54, 2.44, 3.27, 3.79, and 5.00 (GeV/c)^2. The measurements, after radiative corrections, are consistent with R=1, with standard errors ranging from ±0.016 to ±0.123. The results give limits for the size of the two-photon effects.

Additional Information

©1968 The American Physical Society. Received 31 May 1968. We want to thank R.A. Early, H.W. Kendall, P.N. Kirk, S.C. Loken, and L.W. Mo; and also E. Taylor and other members of the spectrometer group, for their contributions to the experiment. We are especially grateful to the operating staff of the SLAC accelerator, particularly to Roger Miller, for providing the positron beam.

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