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Published June 20, 1988 | Published
Journal Article Open

Measurement of the Difference in R=σ_L/σ_T and of σ^A/σ^D in Deep-Inelastic e-D, e-Fe, and e-Au Scattering


We measured the differences in R=σ_L/σ_T and the cross-section ratio σA/σD in deep-inelastic electron scattering from D, Fe, and Au nuclei in the kinematic range 0.2≤x≤0.5 and 1≤Q^2≤5 (Gev/c)^2. Our results for R^A-R^D are consistent with zero for all x and Q^2, indicating that possible contributions to R from nuclear higher-twist effects and spin-0 constituents in nuclei are not different from those in nucleons. The European Muon Collaboration effect is reconfirmed, and the low-x data from all recent experiments, at all Q^2, are now in agreement.

Additional Information

© 1988 The American Physical Society. Received 2 February 1988; published in the issue dated 20 June 1988. We acknowledge the support of Professor B. Richter and the SLAC staff, which was crucial for the success of this experiment. This research was supported by Department of Energy Contracts No. DE-AC02-76ERI3065, No. DE-AC02-76ER02853, No. DE-AC03-96SF00515, and No. W-7405-ENG-48, and National Science Foundation Contracts No. PHY84-l0549 and No. PHY85-05682.

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