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2008

Unraveling duality violations in hadronic tau decays

Cata, Oscar, Golterman, Maarten, Peris, Santi

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There are some indications from recent determinations of the strong coupling constant alpha_s and the gluon condensate that the Operator Product Expansion may not be accurate enough to describe non-perturbative effects in hadronic tau decays.

This breakdown of the Operator Product Expansion is usually referred to as being due to ``Duality Violations.'' With the help of a physically motivated model, we investigate these duality violations.
Based on this model, we argue how they may introduce a non-negligible systematic error in the current analysis, which employs finite-energy sum rules with pinched weights.
In particular, this systematic effect might affect the precision determination of alpha_s from tau decays.

Unraveling duality violations in hadronic tau decays · Around

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