The ratio of sigmaL/sigmaT in DIS at low x
Abstract
Assuming helicity independence for q-qbar scattering in the color-dipole picture, or, equivalently proportionality of sea quark and gluon distributions, we find R(W2,Q2) = 0.5 (approximately) at large Q2, where R(W2,Q2) denotes the ratio of the longitudinal and transverse photoabsorption cross sections. The forthcoming direct measurements of R(W2,Q2) allow one to test the underlying hypotheses.
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