HERA data and collinearly-improved BK dynamics

Abstract

Within the framework of the dipole factorisation, we use a recent collinearly-improved version of the Balitsky-Kovchegov equation to fit the HERA data for inclusive deep inelastic scattering at small Bjorken $x$. The equation includes an all-order resummation of double and single transverse logarithms and running coupling corrections. Compared to similar equations previously proposed in the literature, this work makes a direct use of Bjorken $x$ as the rapidity scale for the evolution variable. We obtain excellent fits for reasonable values for the four fit parameters. We find that the fit quality improves when including resummation effects and a physically-motivated initial condition. In particular, the resummation of the DGLAP-like single transverse logarithms has a sizeable impact and allows one to extend the fit up to relatively large photon virtuality $Q^2$.

16 pages, 4 figures, 2 tables

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• Sub-femtometer scale color charge fluctuations in a proton made of three quarks and a gluon
• A novel formulation of the unintegrated gluon distribution for DIS
• Forward dijets in proton-nucleus collisions at next-to-leading order: the real corrections
• Proton structure functions at NLO in the dipole picture with massive quarks
• Photonuclear $J/\psi$ production at the LHC: proton-based versus nuclear dipole scattering amplitudes
• Diffractive deep inelastic scattering at NLO in the dipole picture: the $q\bar{q}g$ contribution
• Selected topics in diffraction with protons and nuclei: past, present, and future
• Dihadron production in DIS at NLO: the real corrections
• Gluon-mediated inclusive Deep Inelastic Scattering from Regge to Bjorken kinematics
• Inferring the initial condition for the Balitsky-Kovchegov equation
• Saturation effects in SIDIS at very forward rapidities
• Diffractive deeply inelastic scattering in future electron-ion colliders
• Prospects for quarkonium studies at the high-luminosity LHC
• Extended collinearly-improved Balitsky-Kovchegov evolution equation in target rapidity
• Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
• Momentum transfer squared dependence of exclusive quarkonia photoproduction in UPCs
• Solutions to the Balitsky-Kovchegov equation including the dipole orientation
• NLO JIMWLK evolution with massive quarks
• Analytic solution of Balitsky-Kovchegov equation with running coupling constant using homogeneous balance method
• Exclusive quarkonium photoproduction: predictions with the Balitsky-Kovchegov equation including the full impact-parameter dependence
• QCD traveling waves phenomenology revisited
• Complete calculation of exclusive heavy vector meson production at next-to-leading order in the dipole picture
• Solution to the Sudakov suppressed Balitsky-Kovchegov equation and its application to the HERA data
• A parton shower generator based on the GLR equation
• Determination of the initial condition for the Balitsky-Kovchegov equation with transformers
• Improving the solver for the Balitsky-Kovchegov evolution equation with Automatic Differentiation
• Asymptotic factorization of n-particle SU(N) form factors
• Reconstruction of the Dipole Amplitude in the Dipole Picture as a mathematical Inverse Problem
• Collinear resummations for the non-linear evolution in QCD at high energy
• Exclusive production of light vector mesons at next-to-leading order in the dipole picture