Abstract
We present a global fit to HERA data on the reduced cross section measured in electron–proton collisions in the region of small Bjorken-x: x≤x0=10−2 and moderate to high values of the virtuality Q2<Qmax2=650 GeV2. The main dynamical ingredients in the fits are two recently proposed improved BK equations for the description of the small-x evolution of the dipole scattering amplitude [1,2]. These two new equations provide an all-order resummation of double collinear logarithms that arise beyond leading logarithmic accuracy. We show that a very good description of data is possible in both cases, provided the parent dipole or smallest dipole prescriptions are employed for the running of the coupling.
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