Speaker
Description
On behalf of the H1 and ZEUS Collaborations.
Eur. Phys. J. C82 (2022) 243
The HERAPDF2.0 ensemble of parton distribution functions (PDFs) was introduced in2015. The final stage is presented, a next-to-next-to-leading-order (NNLO) analysis of theHERA data on inclusive deep inelasticepscattering together with jet data as published bythe H1 and ZEUS collaborations. A perturbative QCD fit, simultaneously ofαs(M2Z) andand the PDFs, was performed with the resultαs(M2Z)=0.1156±0.0011 (exp)+0.0001−0.0002(model+parameterisation)±0.0029 (scale). The PDF sets of HERAPDF2.0Jets NNLO were de-termined with separate fits using two fixed values ofαs(M2Z),αs(M2Z)=0.1155 and 0.118,since the latter value was already chosen for the published HERAPDF2.0 NNLO analysisbased on HERA inclusive DIS data only. The different sets of PDFs are presented, evalu-ated and compared. The consistency of the PDFs determined with and without the jet datademonstrates the consistency of HERA inclusive and jet-production cross-section data. Theinclusion of the jet data reduced the uncertainty on the gluon PDF. Predictions based on thePDFs of HERAPDF2.0Jets NNLO give an excellent description of the jet-production dataused as input.
