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Impact of low-x resummation on QCD analysis of HERA data

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arxiv 1802.00064 v2 pith:QVVRBWQS submitted 2018-01-31 hep-ph

Impact of low-x resummation on QCD analysis of HERA data

xFitter Developers' team: Hamed Abdolmaleki , Valerio Bertone , Daniel Britzger , Stefano Camarda , Amanda Cooper-Sarkar , Francesco Giuli , Alexander Glazov , Aleksander Kusina
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Agnieszka Luszczak Fred Olness Andrey Sapronov Pavel Shvydkin Katarzyna Wichmann Oleksandr Zenaiev Marco Bonvini
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keywords resummationdatafitsgluonheratensionanalysisbetter
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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 $x$ and low $Q^2$. A resolution of this tension incorporating $\ln(1/x)$-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 $F_L$, it also results in a gluon PDF which is steeply rising at low $x$ for low scales, $Q^2 \simeq 2.5$ GeV$^2$, contrary to the fixed-order NLO and NNLO gluon PDF.

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