The ratio of sigma_L/sigma_T in DIS at low x

Details The ratio of sigma_L/sigma_T in DIS at low x The ratio of sigma_L/sigma_T in DIS at low x

2007-07-23

arxiv.org/abs/0707.3379v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, 4 figures, contribution to the proceedings of DIS2007

Scientific paper

Assuming helicity independence for q-qbar scattering in the color-dipole picture, or, equivalently proportionality of sea quark and gluon distributions, we find R(W^2,Q^2) = 0.5 (approximately) at large Q^2, where R(W^2,Q^2) denotes the ratio of the longitudinal and transverse photoabsorption cross sections. The forthcoming direct measurements of R(W^2,Q^2) allow one to test the underlying hypotheses.

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