Speaker
Description
In recent articles, the discussion on the treatment of Power Corrections in the three-jet limit, along with its influence on precision $\alpha_s$ determinations from fits to event shape experimental data, has attracted a lot of attention. On the basis of a factorization formula for the $e^+e-$ thrust distribution, derived within soft-collinear effective theory, we discuss the treatment of Power Corrections in the tail region of the spectrum and the problems connected to it. In addition, we review past studies on the strong coupling determination from event shapes carried out by some of us, and provide updated results produced with a new numerical code which incorporates recent theoretical developments. Furthermore, we show the mild effect caused by the tau-dependent power correction recently advocated for in the literature.
