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The HERAPDF2.0 ensemble of parton distribution functions (PDFs) wasintroduced in 2015. The final stage is presented, anext-to-next-to-leading-order (NNLO) analysis of the HERA data on inclusivedeep inelastic $ep$ scattering together with jet data as published by the H1and ZEUS collaborations. A perturbative QCD fit, simultaneously of$\alpha_s(M_Z^2)$ and and the PDFs, was performed with the result$\alpha_s(M_Z^2) = 0.1156 \pm 0.0011~{\rm (exp)}~ ^{+0.0001}_{-0.0002}~ {\rm(model}$ ${\rm +~parameterisation)}~ \pm 0.0029~{\rm (scale)}$. The PDF sets ofHERAPDF2.0Jets NNLO were determined with separate fits using two fixed valuesof $\alpha_s(M_Z^2)$, $\alpha_s(M_Z^2)=0.1155$ and $0.118$, since the lattervalue was already chosen for the published HERAPDF2.0 NNLO analysis based onHERA inclusive DIS data only. The different sets of PDFs are presented,evaluated and compared. The consistency of the PDFs determined with and withoutthe jet data demonstrates the consistency of HERA inclusive and jet-productioncross-section data. The inclusion of the jet data reduced the uncertainty onthe gluon PDF. Predictions based on the PDFs of HERAPDF2.0Jets NNLO give anexcellent description of the jet-production data used as input.

Impact of jet-production data on the next-to-next-to-leading-order determination of HERAPDF2.0 parton distributions