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Deep inelastic scattering (DIS) total cross section data at small-x asmeasured by the HERA experiments is well described by Balitsky-Kovchegov (BK)evolution in the leading order dipole picture. Recently the fullNext-to-Leading Order (NLO) dipole picture total cross sections have becomeavailable for DIS, and a working factorization scheme has been devised whichsubtracts the soft gluon divergence present at NLO. We report our recentlypublished work in which we make the first comparisons of the NLO DIS totalcross sections to HERA data. The non-perturbative initial condition to BKevolution is fixed by fitting the HERA reduced cross section data. As the NLOresults for the DIS total cross section are currently available only in themassless quark limit, we also fit a light-quark-only cross section constructedwith a parametrization of published total and heavy quark data. We find anexcellent description of the HERA data. Since the full NLO BK equation iscomputationally expensive, we use a number of beyond LO prescriptions for theevolution that include most important higher order corrections enhanced bylarge transverse logarithms, including the recent version of the equationformulated in terms of the target momentum fraction.

Dipole model at Next-to-Leading Order meets HERA data