Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling 𝛼𝑆⁡(𝑚𝑍)

Physical Review Letters 2024
Kārlis Dreimanis, Antra Gaile, Guntis Pikurs, Andris Potrebko, Markus Seidel, Viesturs Veckalns, CMS Collaboration

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.

DOI
10.1103/PhysRevLett.133.071903
Hyperlink
https://link.aps.org/doi/10.1103/PhysRevLett.133.071903

The CMS Collaboration, A.Hayrapetyan, K.Dreimanis, A.Gaile, G.Pikurs, A.Potrebko, M.Seidel, V.Veckalns ... [et al.]. Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling 𝛼𝑆⁡(𝑚𝑍). Physical Review Letters, 2024, Vol. 133, No. 7, Article number 071903. ISSN 0031-9007. e-ISSN 1079-7114. Pieejams: doi:10.1103/PhysRevLett.133.071903

Publication language
English (en)