Nonperturbative Effects in Energy Correlators: From Characterizing Confinement Transition to Improving α_{s} Extraction

Phys Rev Lett. 2024 Dec 6;133(23):231902. doi: 10.1103/PhysRevLett.133.231902.

Abstract

Energy correlators provide a powerful observable to study fragmentation dynamics in QCD. We demonstrate that the leading nonperturbative corrections for projected N-point energy correlators are described by the same universal parameter for any N, which has already been determined from other event shape fits. Including renormalon-free nonperturbative corrections substantially improves theoretical predictions of energy correlators, notably the transition into the confining region at small angles. Nonperturbative corrections are shown to have a significant impact on α_{s} extractions.