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T: Fachverband Teilchenphysik

T 12: QCD (Theorie) 2

T 12.1: Vortrag

Dienstag, 10. März 2009, 16:45–17:00, M109

NNNLL Order Determination of alpha_s from Global Fits to e+ e- Thrust Data — •Vicent Mateu¹, Riccardo Abbate², Michael Fickinger³, Andre Hoang¹, and Iain Stewart² — ¹MPI Munich — ²MIT — ³University of Arizona

We present a global analysis of the thrust distribution in e+ e- to jets. The theory divides itself into three regions: peak region, tail region, and far tail region. Using the soft-collinear efective theory we present a formalism that allows us to consistently and simultaneously treat all three regions. We include the 3-loop fixed order results, a resummation with NNNLL accuracy, and non-perturbative corrections. Our global fit to the data incorporates a complete basis to model the soft function, and a non-perturbative running gap to ensure stability of this model to perturbative corrections; features that go beyond the capabilities of current Monte Carlo generators.