The Color Dipole Picture and the ratio of R(W, Q) = sigma L/sigma T

Abstract

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(W2, Q2) = 0.375 or, equivalently, FL/F2 = 0.27 at x<<0.1 and Q2 sufficiently large, while R(W2, Q2) = 0.5, if this effect is not taken into account. Forthcoming experimental data from HERA will allow to test this prediction.

arXiv comment13 pages, 1 figure

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• Color Dipole Picture of Deep Inelastic Scattering, Revisited
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• The color dipole model bounds with the gluon-gluon recombination correction
• On Ultrahigh-energy Neutrino Scattering
• The color dipole picture of low-x DIS
• Comment on "The New F_L Measurement from HERA and the Dipole Model"
• Physical limits in the Color Dipole Model Bounds
• Color dipole cross section in the DGLAP improved saturation model
• Reduced cross section and gluon distribution in a momentum-space approach
• The Proton Gluon Distribution from the Color Dipole Picture
• First Measurements of FL at Low Bjorken x
• The Color-dipole Picture and FL
• The Ratio of sigma_L(W2, Q2)/sigma_T(W2, Q2) in the Color Dipole Picture
• Investigation of the ratio $\frac{{\sigma }_r}{F_2}(Q^2/s,Q^2)$ in the momentum-space approach