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Published August 29, 1988 | Published
Journal Article Open

Precision Measurement of R=σ_L/σ_T and F_2 in Deep-Inelastic Electron Scattering


We report new results on a precision measurement of the ratio R=σ_L/σ_T and the structure function F_2 for deep-inelastic electron-nucleon scattering in the kinematic range 0.2≤x≤0.5 and 1≤Q^2≤10 (GeV/c)^2. Our results show, for the first time, a clear falloff of R with increasing Q^2. Our R and F_2 results are in good agreement with QCD predictions only when corrections for target-mass effects are included.

Additional Information

© 1988 The American Physical Society. Received 20 May 1988; published in the issue dated 29 August 1988. We acknowledge the support of Dr. 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-AC02-76ER13065, No. DE-AC02-76ER02853, and No. DE-AC03-76SF00S 15, and National Science Foundation Grants No. PHY84-10549 and No. PHY85-05682.

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