Angular distribution of thrust axis with power-suppressed contribution in e+e- annihilation

TL;DR

This paper analyzes the angular distribution of thrust axes in e+e- annihilation, incorporating power-suppressed contributions and non-perturbative effects within the SCET framework, to improve understanding of jet structures and electroweak measurements.

Contribution

It provides a detailed NLL-level calculation of the angular distribution of jets considering power-suppressed terms and non-perturbative corrections in the SCET framework.

Findings

Derived the angular distribution of hadron jets as a function of thrust.

Quantified effects of non-perturbative hadronization corrections.

Discussed implications for electroweak measurements via jet asymmetry.

Abstract

Structure function of e+e- to hadrons cross section proportional to the longitudinal part of the hadron tensor is power suppressed with respect to an event shape variable in the two-jet region. In the SCET framework, we study the event shape distribution for this structure function to NLL level of accuracy. As, a result we obtain the angular distribution of hadron jets as a function of the thrust, in the two jet region. We further examine effects of non-perturbative hadronization corrections by adopting a shape function that reproduce the observed event shape distributions. Impacts of our findings on the electroweak measurements via the jet angular forward-backward asymmetry are discussed.