The Ratio of sigma_L(W2, Q2)/sigma_T(W2, Q2) in the Color Dipole Picture

Details The Ratio of sigma_L(W2, Q2)/sigma_T(W2, Q2) in the Color Dipole Picture The Ratio of sigma_L(W2, Q2)/sigma_T(W2, Q2) in the Color Dipole Picture

2008-07-07

arxiv.org/abs/0807.0963v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Talk presented at DIS 2008, 4 pages with 1 figure

Scientific paper

The transverse size of q q-bar fluctuations of the longitudinal photon is reduced relative to the transverse size of q q-bar fluctuations of the transverse photon. This implies R(W^2, Q^2) = 0.375 or, equivalently, F_L(W^2,Q^2)/F_2(W^2,Q^2) = 0.27 for x = Q^2/W^2 << 1 and Q^2 sufficiently large, while R(W^2, Q^2) = 0.5, if this effect is not taken into account. Forthcoming experimental data from HERA will allow to test this prediction.

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