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

Abt, I.; Wing, M.; Foster, B.; Wichmann, K.; Myronenko, V.; Cooper-Sarkar, A. M.

Preprint/Report

PUBDB-2017-10335

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

Abt, I.Extern* ; Cooper-Sarkar, A. M. ; Foster, B.Extern*DESY* ; Myronenko, V.DESY* ; Wichmann, K. (Corresponding author)DESY* ; Wing, M.Extern*

2017

[10.3204/PUBDB-2017-10335]

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2017-10335

Report No.: DESY-17-051; arXiv:1704.03187

Abstract: A phenomenological study of the final combined HERA data on inclusive deep inelastic scattering has been performed. The data are presented and investigated for a kinematic range extending from values of the four-momentum transfer, $Q^2$, above 104 GeV$^2$ down to the lowest values observable at HERA of $Q^2$=0.045 GeV$^2$ and Bjorken x, x$_{Bj}$ = 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 Dokshitzer-Gribov-Lipatov-Altarelli-Parisi formalism from the highest $Q^2$ down to $Q^2$ of a few GeV$^2$. The Regge formalism with the soft Pomeron pole can describe the data up to $Q^2$ ≈ 0.65 GeV$^2$. The complete data set can be described by a new fit using the Abramowicz-Levin-Levy-Maor parametrization. The region between the Regge and the perturbative QCD regimes is of particular interest.

Keyword(s): quantum chromodynamics: perturbation theory ; deep inelastic scattering: inclusive reaction ; factorization: collinear ; parton: density ; DESY HERA Stor ; Regge ; parametrization ; kinematics ; pomeron ; DGLAP equation ; data analysis method ; small-x ; experimental results ; p: structure function ; higher-order: 2