Recent QCD results on HERA data including small-x resummation

by Francesco Giuli (Oxford)

Thursday 5 Jul 2018, 14:00 → 15:00 Europe/Zurich

Other Institutes

Fits to the final combined HERA inclusive cross-section data 
within the conventional DGLAP framework of QCD have shown some tension 
at low x and low Q2. A resolution of this tension incorporating 
ln(1/x)-resummation terms into the HERAPDF fits is investigated using 
the xFitter framework. The kinematic region where this resummation has a 
significant effect is delineated. Such high-energy resymmation not only 
gives a better description of the low-Q2 data, particularly of the 
longitudinal structure function FL, it also results in a gluon PDF which 
is steeply rising at low-x for low scales e.g. Q2 ~ 2.7 GeV2, contrary 
to the FO NLO and NNLO gluon PDF.

Giuli_Bicocca18.pdf