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

TL;DR

This paper presents a precise determination of the strong coupling constant $ ext{s}$ using NNLO QCD analysis of dijet production across a wide energy range, confirming the running of $ ext{s}$ as predicted by QCD.

Contribution

It provides the first determination of $ ext{s}$ up to 7 TeV using LHC data and combines HERA data to probe $ ext{s}$ at smaller scales, extending the precision and scale reach.

Findings

$ ext{s}(m_ ext{Z})=0.1178 \, extpm \, 0.0022$ from LHC data

First $ ext{s}$ determination up to 7 TeV

Results agree with QCD predictions for the running of $ ext{s}$

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.