Proton structure functions in the dipole picture of BFKL dynamics

The F2, FG, R = FLFT proton structure functions are derived in the QCD dipole picture. Assuming kT and renormalization-group factorization, we relate deep-inelastic proton scattering to deep-inelastic onium scattering. We get a three-parameter fit of the 1994 H1 data in the low-x, moderate Q2 range. The ratios FGF2 and R are predicted without further adjustment. The dipole picture of BFKL dynamics is shown to provide a relevant model for quantitatively describing the proton structure functions at HERA. The predictions for F2 and FG are compatible with the next-to-leading order DGLAP analysis, while R is expected to be significantly lower at very small x.