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Duality violations in tau hadronic spectral moments · Around

2010

Duality violations in tau hadronic spectral moments

Boito, D. R., Cata, O., Golterman, M. et al.

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Evidence is presented for the necessity of including duality violations in a consistent description of spectral function moments employed in the precision determination of $\alpha_s$ from $\tau$ decay.

A physically motivated ansatz for duality violations in the spectral functions enables us to perform fits to spectral moments employing both pinched and unpinched weights.
We describe our analysis strategy and provide some preliminary findings.
Final numerical results await completion of an ongoing re-determination of the ALEPH covariance matrices incorporating correlations due to the unfolding procedure which are absent from the currently posted versions.

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