Determination of the strong coupling and its running from measurements of inclusive jet production

TL;DR

This paper precisely measures the strong coupling constant $oldsymbol{oldsymbol{oldsymbol{ ext{α}}}_ ext{S}}$ at various energies using CMS jet data and HERA deep-inelastic scattering, confirming its energy dependence within the Standard Model.

Contribution

It provides a high-precision determination of $oldsymbol{ ext{α}}_ ext{S}$ at the Z boson mass and explores its running over a wide energy range using combined collider data.

Findings

$oldsymbol{ ext{α}}_ ext{S}(m_ ext{Z})$ = 0.1176 with uncertainties

Confirmed the running of $ ext{α}_ ext{S}$ between 100 and 1600 GeV

Enhanced precision in $ ext{α}_ ext{S}$ measurements at high energies

Abstract

The value of the strong coupling $\alpha_\mathrm{S}$ is determined in a comprehensive analysis at next-to-next-to-leading order accuracy in quantum chromodynamics. The analysis uses double-differential cross section measurements from the CMS Collaboration at the CERN LHC of inclusive jet production in proton-proton collisions at centre-of-mass energies of 2.76, 7, 8, and 13 TeV, combined with inclusive deep-inelastic data from HERA. The value $\alpha_\mathrm{S}(m_\mathrm{Z})$ = 0.1176$\,^{+0.0014}_{-0.0016}$ is obtained at the scale of the Z boson mass. By using the measurements in different intervals of jet transverse momentum, the running of $\alpha_\mathrm{S}$ is probed for energies between 100 and 1600 GeV.