Assessing the sensitivity of energy-energy correlations in e+e− annihilation to TMD dynamics
Alejandro Bris, Ignazio Scimemi, Alexey Vladimirov
Abstract
A bstract We critically examine the back-to-back limit of the energy-energy correlation (EEC) in e + e − annihilation as a potential source of information on the Collins-Soper kernel and the strong coupling constant. The analysis is performed within the framework of transverse momentum dependent (TMD) factorization at next-to-next-to-next-to-next-to-leading logarithmic (N 4 LL) accuracy, using a global fit to all available experimental data. Contrary to previous claims, we demonstrate that the current data do not provide meaningful constraints on either the Collins-Soper kernel or α s .
Topics & Concepts
PhysicsAnnihilationFactorizationSensitivity (control systems)LogarithmLimit (mathematics)Statistical physicsKernel (algebra)Coupling (piping)Momentum (technical analysis)Quantum electrodynamicsDynamics (music)Measure (data warehouse)Particle physicsStatistical fluctuationsTransverse planeCurrent (fluid)Coupling constantCorrelationSimple (philosophy)Nuclear physicsScalingAdvanced Chemical Physics StudiesQuantum Chromodynamics and Particle InteractionsAtomic and Molecular Physics