# QCD Results from HERA

## TL;DR

This paper presents new QCD measurements from HERA, including heavy quark masses, prompt photon production, and jet cross sections, with comparisons to advanced theoretical predictions and a precise determination of the strong coupling constant.

## Contribution

It provides the first NNLO predictions for jet cross sections and a new precise measurement of the strong coupling constant from HERA data.

## Key findings

- Heavy quark masses: m_c=1290 MeV, m_b=4049 MeV
- First NNLO comparison for jet production
- Alpha_s(m_Z)=0.1157 with uncertainties

## Abstract

New results on the measurements of the hadronic final state in neutral-current deep-inelastic scattering at HERA are presented. A combination of reduced charm and beauty cross sections is presented and the masses of the heavy quarks are determined to $m_c=1290\,(^{+78}_{-53})\,{\rm MeV}$ and $m_b=4049\,(^{+138}_{-118})\,{\rm MeV}$. The measurement of the production of prompt photons accompanied by a jet provides a precise test of QCD predictions. Measurements of jet production cross sections are presented and compared for the first time to next-to-next-to-leading order predictions (NNLO). The strong coupling constant is determined from inclusive jet and dijet production cross sections using NNLO predictions to $\alpha_s(m_Z)=0.1157\,(6)_{\rm exp}\,(^{+31}_{-26})_{\rm th}$.