Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling ${\ensuremath{\alpha}}_{S}({m}_{Z})$

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2024
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American Physical Society
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Energy correlators that describe energy-weighted distances between two or three particles in a hadronic jet are measured using an event sample of √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: 𝛼𝑆⁡(𝑚𝑍)=0.122⁢9+0.0040−0.0050, the most precise 𝛼𝑆⁡(𝑚𝑍) value obtained using jet substructure observables.

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CMS Collaboration. (2024). Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling \ensuremathαS(mZ). Physical Review Letters, 133(7), 071903. https://doi.org/10.1103/PhysRevLett.133.071903

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