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The strong coupling from tau decays without prejudice
Diogo Boito, Maarten Golterman, Matthias Jamin +4
We review our recent determination of the strong coupling α_s from the OPAL data for non-strange hadronic tau decays. We find that α_s(m^2_τ) =0.325+-0.018 using fixed-order pertur…
Low-energy constants and condensates from the tau hadronic spectral functions
Diogo Boito, Maarten Golterman, Matthias Jamin +2
We use results of fits to the OPAL spectral data, obtained from non-strange hadronic τdecays, to evaluate the difference between the vector and axial current correlators, Π_{V-A}(Q…
Perturbative expansion of tau hadronic spectral function moments and alpha_s extractions
Martin Beneke, Diogo Boito, Matthias Jamin
Various moments of the hadronic spectral functions have been employed in the determination of the strong coupling alpha_s from tau decays. In this work we study the behaviour of th…
An updated determination of α_s from tau decays
Diogo Boito, Maarten Golterman, Matthias Jamin +4
Employing our previous framework to treat non-perturbative effects self-consistently, including duality violations, we update the determination of the strong coupling, α_s, using a…
The scalar gluonium correlator: large-beta_0 and beyond
Matthias Jamin
The investigation of the scalar gluonium correlator is interesting because it carries the quantum numbers of the vacuum and the relevant hadronic current is related to the anomalou…