α_s from the (revised) ALEPH data for τ decay

2014/10/30 by Diogo Boito, Maarten Golterman, Boito, Diogo +7
Computer Science · Physics and Astronomy · #Computational Physics and Python Applications #FOS: Physical sciences #High Energy Physics - Lattice (hep-lat) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Nuclear Theory (nucl-th) #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions

paper · pdf · doi:10.48550/arxiv.1410.8415

openalex publication_date 2014/10/30 · openalex created_date 2020/10/08 · openalex updated_date 2026/07/28

Abstract

We present a new analysis of α_s from hadronic τ decays based on the recently revised ALEPH data. The analysis is based on a strategy which we previously applied to the OPAL data. We critically compare our strategy to the one traditionally used and comment on the main differences. Our analysis yields the values α_s(m_τ²)=0.296± 0.010 using fixed-order perturbation theory, and α_s(m_τ²)=0.310± 0.014 using contour-improved perturbation theory. Averaging these values with our previously obtained values from the OPAL data, we find α_s(m_τ²)=0.303± 0.009, respectively, α_s(m_τ²)=0.319± 0.012, as the most reliable results for α_s from τ decays currently available.

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