Alpha_s Determination from Tau Decays: Theoretical Status
Antonio Pich
TL;DR
This paper updates the theoretical calculation of the tau hadronic width, emphasizing its sensitivity to alpha_s(m_tau^2), and discusses the experimental determination and uncertainties of this strong coupling constant.
Contribution
It provides an updated theoretical analysis including O(alpha_s^4) contributions for precise alpha_s determination from tau decays.
Findings
Updated theoretical description with O(alpha_s^4) terms
High sensitivity of tau width to alpha_s(m_tau^2)
Discussion of experimental uncertainties in alpha_s measurement
Abstract
The total tau hadronic width can be accurately calculated using analyticity and the operator product expansion. The result turns out to be very sensitive to the value of alpha_s(m_tau^2), providing a precise determination of the strong coupling constant. The theoretical description of this observable is updated, including the recently computed O(alpha_s^4) contributions. The experimental determination of alpha_s(m_tau^2) and its actual uncertainties are discussed.
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Taxonomy
TopicsParticle physics theoretical and experimental studies · Quantum Chromodynamics and Particle Interactions · Atomic and Subatomic Physics Research