Probing the Structure of Jets: Factorized and Resummed Angularity Distributions in SCET

2009/05/04 by Christopher Lee, Lee, Christopher, Andrew Hornig +3
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.0905.0168

openalex publication_date 2009/05/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

Using the framework of soft-collinear effective theory (SCET), we factorize and calculate e⁺e^- angularity distributions, including perturbative resummation and the incorporation of a universal model for the nonperturbative soft function. Angularities τ_a are a class of event shapes varying in their sensitivity to the substructure of jets in the final state, controlled by a continuous parameter a<2. We calculate the jet and soft functions in factorized angularity distributions for all a<1 to first order in the strong coupling α_s and resum large logarithms to next-to-leading logarithmic (NLL) accuracy. We employ a universal model for the nonperturbative soft function with a gap parameter which cancels the renormalon ambiguity in the partonic soft function.

Citations

• Hemisphere Soft Function at O(alpha_s²) for Dijet Production in e+e- Annihilation

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