Centro de Excelencia Severo Ochoa
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IFT Seminar Room/Red Room
I will discuss our recent determination of the strong coupling from hadronic tau decays, as measured by ALEPH and OPAL. This determination is controversial, because the rather low tau mass makes it necessary to disentangle non-perturbative effects that "contaminate" perturbation theory. In particular, I will consider effects due to the violation of quark-hadron duality.
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