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Instanton contributions to the τ decay widths

URN to cite this document:
Balitsky, I. I. ; Beneke, M. ; Braun, Vladimir M.
Date of publication of this fulltext: 12 Apr 2010 12:07


Contrary to some previous claims, we find a sizable instanton contribution to the finite energy sum rule used to extract the value of the strong coupling from the measured τ decay widths. It is of the same order of magnitude as standard nonperturbative corrections induced by vacuum quark and gluon condensates. Our result indicates that there might be no hierarchy of power corrections in finite ...


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