Joint INFN-UNIMI-UNIMIB Pheno Seminars
Recent QCD results on HERA data including small-x resummation
by
→
Europe/Zurich
Other Institutes
Other Institutes
Milan Bicocca University Physics Department
Piazza della Scienza 3
U2 room 5017
Description
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.