HERA Inclusive Neutral and Charged Current Cross Sections and a New PDF Fit, HERAPDF 2.0

TL;DR

This paper presents new combined HERA deep inelastic scattering data and a refined parton distribution function set, HERAPDF 2.0, along with a precise determination of the strong coupling constant at NNLO and NLO.

Contribution

It introduces the HERAPDF 2.0 set based on combined HERA data and provides a new precise measurement of alpha_s at NLO.

Findings

HERAPDF 2.0 improves parton distribution accuracy

Precise alpha_s(M_Z) value of 0.1184±0.0016 at NLO

Enhanced understanding of proton structure at NNLO

Abstract

In this talk, I present the brand new results from the H1 and ZEUS Collaborations on the combination of all previously published inclusive deep inelastic cross sections at HERA for neutral and charged current $e^\pm p$ scattering for zero beam polarisation and the corresponding parton distributions functions, HERAPDF 2.0, at up to next-to-next-to-leading order (NNLO). The results also include a new precise determination at next-to-leading order (NLO) of the strong coupling constant $\alpha_s(M^2_Z)=0.1184\pm 0.0016$ (excluding scale uncertainties) based on a simultaneous fit to the combined inclusive cross section data and jet production data.