QCD Results from HERA

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 $m_c=1290{(}_{-53}^{+78})\mathrm{MeV}$ and $m_b=4049{(}_{-118}^{+138})\mathrm{MeV}$. 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 ${\alpha }_s(m_Z)=0.1157(6{)}_{\exp }{(}_{-26}^{+31}{)}_{\mathrm{th}}$.

Comments: 4 pages, 6 figures. Proceedings for the 52nd Rencontres de Moriond on QCD and High Energy Interactions