# DIS 2015 - XXIII. International Workshop on Deep-Inelastic Scattering and Related Subjects

27 April 2015 to 1 May 2015
US/Central timezone

## NNLL Resummation of Event-Shapes in $e^+e^-$ Annihilation

30 Apr 2015, 12:00
25m
FORUM ()

### FORUM

WG4 QCD and Hadronic Final States

### Speaker

Heather Turmeau Mcaslan (University of Sussex (GB))

### Description

Event shape observables are essential tools for studying the behaviour of high energy QCD. Yet in the region where soft and collinear gluon emission is most dominant, standard perturbation theory is rendered unreliable and the series must be resummed to all orders in the strong coupling. We have recently developed a general method for the resummation of event shapes, in e+e- annihilation, at next-to-next-to-leading logarithmic accuracy. We implement the novel method semi-numerically and reproduce four already-known predictions, as well as producing three new results. We match our findings to fixed-order results, up to NNLO.

### Primary author

Heather Turmeau Mcaslan (University of Sussex (GB))

### Co-authors

Andrea Banfi (University of Sussex) Giulia Zanderighi (CERN) Pier Francesco Monni (University of Oxford (GB))

 Slides