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 are consistent with the trends in the simulation that reveal two key features of the strong interaction: confinement and asymptotic freedom. By comparing the ratio of the measured three- and two-particle energy correlator 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.
Categories: hep-ex