Abstract
Event shapes are invaluable QCD tools for theoretical calculations and experimental measurements. We revise the definition of these observables in e + e − annihilation and in hadron collisions, and give a review of the state-of-the-art results for their resummation. Then we detail how recent work on the re-summation of event shapes in electron-positron annihilation can provide us with the tools to extend resummation of generic hadronic event shapes to NNLL accuracy. We match our findings to fixed-order results at NNLO accuracy, showing the sizeable effects of resummation in the relevant regions of phase space.
Highlights
Event ShapesEvent shapes are measures of the hadronic energy flow in a system of particles
Event shapes are invaluable QCD tools for theoretical calculations and experimental measurements
Using the formalism of CAESAR we have recently developed a resummation method for event shapes in e+e− annihilation at NNLL order
Summary
Event shapes are measures of the hadronic energy flow in a system of particles. These observables are useful for tuning Monte Carlo generators and extraction of the strong coupling αs. Q where the vector n maximised by the sum defines the thrust axis, nT and Q is the total centre of mass energy. Using these hemispheres we can define jet broadening
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