  Energy correlators that describe energy-weighted distances between two or
three particles in a jet are measured using an event sample of $\sqrt{s}$ = 13
TeV proton-proton collisions collected by the CMS experiment and corresponding
to an integrated luminosity of 36.3 fb$^{-1}$. The measured distributions
reveal two key features of the strong interaction: confinement and asymptotic
freedom. By comparing the ratio of the two measured distributions with
theoretical calculations that resum collinear emissions at approximate
next-to-next-to-leading logarithmic accuracy matched to a next-to-leading order
calculation, the strong coupling is determined at the Z boson mass:
$\alpha_\mathrm{S}(m_\mathrm{Z})$ = 0.1229$^{+0.0040}_{-0.0050}$, the most
precise $\alpha_\mathrm{S}(m_\mathrm{Z})$ value obtained using jet substructure
observables.
