Impact of low-x resummation on QCD analysis of HERA data
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 xFitte...
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Veröffentlicht in: | The European physical journal. C, Particles and fields Particles and fields, 2018-08, Vol.78 (8), p.621-14, Article 621 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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
≃
2.5
GeV
2
, contrary to the fixed-order NLO and NNLO gluon PDF. |
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ISSN: | 1434-6044 1434-6052 |
DOI: | 10.1140/epjc/s10052-018-6090-8 |