Measurement of Energy Correlators inside Jets and Determination of the Strong Coupling α_s(m_Z)
CMS Collaboration, A. Hayrapetyan, Erdmann, Wolfram, Horisberger, Roland, Aarrestad, Thea K., Androsov, Konstantin, Backhaus, Malte, Calandri, Alessandro, Cazzaniga, Cesare, Datta, Kaustuv, De Cosa, Annapaola, A. Li, M. Dittmar, Donegà, Mauro, Eble, Florian, Galli, Massimiliano, Gedia, Krunal, Glessgen, Franz, Grab, Christophorus, Hits, Dmitry Alexandrovich, Lustermann, Werner, Lyon, Anne-Mazarine, Manzoni, Riccardo Andrea, Marchegiani, Matteo, Marchese, Luigi, Martin Perez, Cristina, Mascellani, Anna, Nessi-Tedaldi, Francesca, Pauss, Felicitas, Perovic, Vasilije, Pigazzini, Simone, Reissel, Christina, Reitenspiess, Thomas, Ristic, Branislav, Riti, Federica, Seidita, Roberto, Steggemann, Jan, Valsecchi, Davide, Wallny, Rainer, B. Clerbaux
Abstract
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: α_S(m_Z) = 0.1229₋₀.₀₀₅₀⁺⁰.⁰⁰⁴⁰, the most precise α_S(m_Z) value obtained using jet substructure observables.