Fits to the final combined HERA deep-inelastic scattering cross-section data within the conventional DGLAP framework of QCD have shown some tension at low and low . A resolution of this tension incorporating -resummation terms into the HERAPDF fits is investigated using the xFitter program. The kinematic region where this resummation is important is delineated. Such high-energy resummation not only gives a better description of the data, particularly of the longitudinal structure function , it also results in a gluon PDF which is steeply rising at low for low scales, , contrary to the fixed-order NLO and NNLO gluon PDF.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6191127 | PMC |
| http://dx.doi.org/10.1140/epjc/s10052-018-6090-8 | DOI Listing |
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