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

Autor: xFitter Developers’ team, Hamed Abdolmaleki, Valerio Bertone, Daniel Britzger, Stefano Camarda, Amanda Cooper-Sarkar, Francesco Giuli, Alexander Glazov, Aleksander Kusina, Agnieszka Luszczak, Fred Olness, Andrey Sapronov, Pavel Shvydkin, Katarzyna Wichmann, Oleksandr Zenaiev, Marco Bonvini
Jazyk: angličtina
Rok vydání: 2018
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 78, Iss 8, Pp 1-14 (2018)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-018-6090-8
Popis: Abstract 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 $$Q^2$$ Q2 . A resolution of this tension incorporating $$\ln (1/x)$$ 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 $$F_L$$ FL , it also results in a gluon PDF which is steeply rising at low x for low scales, $$Q^2 \simeq 2.5\,\hbox {GeV}^2$$ Q2≃2.5GeV2 , contrary to the fixed-order NLO and NNLO gluon PDF.
Databáze: Directory of Open Access Journals
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