Precision determination of ${\alpha }_{\text{s}}$ from Dijet Cross Sections in the Multi-TeV Range

Abstract

In this talk we present a determination of the strong coupling constant ${\alpha }_{\text{s}}$ and its energy-scale dependence based on a next-to-next-to-leading order (NNLO) QCD analysis of dijet production. Using the invariant mass of the dijet system to probe ${\alpha }_{\text{s}}$ at different scales, we extract a value of ${\alpha }_{\text{s}}(m_{\text{Z}})=0.1178\pm 0.0022$ from LHC dijet data. The combination of various LHC datasets significantly extends the precision and scale reach of the analysis, enabling the first determination of ${\alpha }_{\text{s}}$ up to 7 TeV. By incorporating dijet cross sections from HERA, we further probe ${\alpha }_{\text{s}}$ at smaller scales, covering a kinematic range of more than three orders of magnitude. Our results are in excellent agreement with QCD predictions based on the renormalization group equation, providing a stringent test of the running of the strong coupling across a wide energy range.

Comments: Contribution to the 2025 QCD session of the 59th Rencontres de Moriond