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arXiv · 1704.03187

Investigation into the limits of perturbation theory at low Q^2 using HERA deep inelastic scattering data

I. Abt·A. M. Cooper-Sarkar·B. Foster·V. Myronenko·K. Wichmann·M. Wing
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Abstract

A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering (DIS) has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 10$^4$ GeV$^2$ down to the lowest values observable at HERA of $Q^2$ = 0.045 GeV$^2$ and Bjorken $x$, $x_{\rm Bj}$ = 6 $\cdot$ 10$^{-7}$. The data are well described by fits based on perturbative quantum chromodynamics (QCD) using collinear factorisation and evolution of the parton densities encompassed in the DGLAP formalism from the highest $Q^2$ down to $Q^2$ of a few GeV$^2$. The Regge formalism can describe the data up to $Q^2 \approx$ 0.65 GeV$^2$. The complete data set can be described by a new fit using the ALLM parameterisation. The region between the Regge and the perturbative QCD regimes is of particular interest.

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I. Abt, A. M. Cooper-Sarkar, B. Foster, V. Myronenko, K. Wichmann, M. Wing. 2017-07-18. Investigation into the limits of perturbation theory at low Q^2 using HERA deep inelastic scattering data. https://doi.org/10.1103/physrevd.96.014001

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