Proton structure functions at NLO in the dipole picture with massive quarks

Abstract

We predict heavy quark production cross sections in Deep Inelastic Scattering at high energy by applying the Color Glass Condensate effective theory. We demonstrate that when the calculation is performed consistently at next-to-leading order accuracy with massive quarks it becomes possible, for the first time in the dipole picture with perturbatively calculated center-of-mass energy evolution, to simultaneously describe both light and heavy quark production data at small xBj. We furthermore show how the heavy quark cross section data provides additional strong constraints on the extracted non-perturbative initial condition for the small-xBj evolution equations.

Diffractive scattering at next-to-leading order in the dipole picture

“…The center-of-mass energy dependence of the dipole amplitude satisfies the Balitsky-Kovchegov equation [6,7]. The non-perturbative initial condition for it is typically obtained by fitting the HERA structure function data [8], and excellent descriptions of these measurements have been obtained both at leading [9,10] and next-to-leading order accuracy [11,12].…”