  The Impact-Parameter dependent Color Glass Condensate (b-CGC) dipole model is
based on the Balitsky-Kovchegov non-linear evolution equation and improves the
Iancu-Itakura-Munier dipole model by incorporating the impact-parameter
dependence of the saturation scale. Here we confront the model to the recently
released high precision combined HERA data and obtain its parameters. The b-CGC
results are then compared to data at small-x for the structure function, the
longitudinal structure function, the charm structure function, exclusive vector
meson (J/\psi, \phi, \rho) production and Deeply Virtual Compton Scattering
(DVCS). We also compare our results with the Impact-Parameter dependent
Saturation model (IP-Sat). We show that most features of inclusive DIS and
exclusive diffractive data, including the Q^2, W, |t| and x dependence are
correctly reproduced in both models. Nevertheless, the b-CGC and the IP-Sat
models give different predictions beyond the current HERA kinematics, namely
for the structure functions at very low x and high virtualities Q^2, and for
the exclusive diffractive vector meson and DVCS production at high t. This can
be traced back to the different power-law behavior of the saturation scale in
x, and to a different impact-parameter b dependence of the saturation scale in
these models. Nevertheless, both models give approximately similar saturation
scale Q_S<1 GeV for the proton in HERA kinematics, and also both models lead to
the same conclusion that the typical impact-parameter probed in the total
\gamma^{*}p cross-section is about b\approx 2\div 3 GeV^{-1}. Our results
provide a benchmark for further investigation of QCD at small-x in heavy ion
collisions at RHIC and the LHC and also at future experiments such as an
Electron-Ion Collider and the LHeC.
