Measurements of R=sigmaL/sigmaT for 0.03<x<0.1 and Fit to World Data
E143 collaboration
Abstract
Measurements were made at SLAC of the cross section for scattering 29 GeV electrons from carbon at a laboratory angle of 4.5 degrees, corresponding to 0.03<x<0.1 and 1.3<Q2<2.7 GeV2. Values of R=sigmaL/sigmaT were extracted in this kinematic range by comparing these data to cross sections measured at a higher beam energy by the NMC collaboration. The results are in reasonable agreement with pQCD calculations and with extrapolations of the R1990 parameterization of previous data. A new fit is made including these data and other recent results.
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