Engineering topics
Publications and source records attributed to Peris, Santiago.
We present a brief summary of our recent determination of αs from e + e - → hadrons, in the region 3 ≤ s ≤ 4 GeV 2 , with s the square of the center-of-mass energy.
We review how the current precision attained in the extraction of $α_s(m_τ)$ from hadronic $τ$ decays requires the inclusion of Duality Violations (DVs) in the analysis, even though these decays are largely dominated by perturbation theory. A weighted average using the OPAL and ALEPH experimental data yields $αs(m_Z) =$ 0.1165$±$0.0012 and $αs(m_Z) =$ 0.1185$±$0.0015 in fixed-orderand contour-improved perturbation theory, respectively.