SEMINAR - Issues in alphas determinations from tau decays

Friday November 23rd 2012, 2:30 pm - Seminar room

Speaker: Diogo Boito (Technische Universität München)

Abstract: We will discuss recent developments in the QCD description of hadronic tau decays with emphasis in the perturbative contribution. Various moments of the hadronic spectral functions have been employed in the determination of the strong coupling alpha_s from tau decays.We will analyse the behaviour of their perturbative series under different assumptions for the large-order corrections and for the renormalization group improvement of the series.

Some moments commonly employed in alpha_s analyses from tau decays should be avoided because of their perturbative instability. In the non-perturbative sector, contributions from violations of quark-hadron duality have recently been incorporated in a quantitative way in an alpha_s extraction. We will discuss why they are needed in a realistic determination of the strong coupling from tau decay data. Finally, we will argue that some of the recent analyses do not employ an optimal strategy for an alpha_s determination.



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