Abstract
© 2016 World Scientific Publishing Company. In this review, we discuss why, in the determination of αs(mτ2) from hadronic τ decays, two important assumptions made in most of previous analyses, namely the neglect of higher-dimension condensates and of duality violations (DVs), have introduced uncontrolled systematic errors into this determination. Although the use of pinched weights is usually offered as a justification of these assumptions, we explain why it is not possible to simultaneously suppress these two contributions; particularly since the Operator Product Expansion (OPE) is expected to be an asymptotic, rather than a convergent expansion. There is not only experimental and theoretical evidence for DVs but they also affect the extraction of αs(mτ2).
Original language | English |
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Article number | 1630031 |
Journal | Modern Physics Letters A |
Volume | 31 |
Issue number | 30 |
DOIs | |
Publication status | Published - 28 Sep 2016 |
Keywords
- QCD
- α s
- τ decays