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| Home > Publications database > Study of HERA $\mathrm{ep}$ data at low $\mathrm{Q^2}$ and low $\mathrm{x_{Bj}}$ and the need for higher-twist corrections to standard perturbative QCD fits |
| Report/Journal Article | PUBDB-2016-04400 |
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2016
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevD.94.034032
Report No.: DESY-16-064; arXiv:1604.02299
Abstract: A detailed comparison of HERA data at low Bjorken-x and low four-momentum-transfer squared, Q$^2$, with predictions based on lnQ$^2$ evolution (DGLAP) in perturbative quantum chromodynamics suggests inadequacies of this framework. The standard DGLAP evolution was augmented by including an additional higher-twist term in the description of the longitudinal structure function, F$_L$. This additional term, F$_L$A$_L^{HT}$/Q$^2$, improves the description of the reduced cross sections significantly. The resulting predictions for F$_L$ suggest that further corrections are required for Q$^2$ less than about 2 GeV$^2$.
Keyword(s): DESY HERA Stor ; electron p: scattering ; DGLAP equation ; quantum chromodynamics: perturbation theory ; quantum chromodynamics: small-x ; momentum transfer: low ; structure function: longitudinal
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Preprint/Internal Report
Study of HERA $ep$ Data at Low $Q^2$ and Low $x_{Bj}$ and the Need for Higher-Twist Corrections to Standard pQCD Evolution
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