Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-19
Nucl.Phys.Proc.Suppl.218:104-109,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
6 pages, 3 figures. Talk given at 11th International Workshop on Tau Lepton Physics, Manchester, UK, 13-17 September 2010
Scientific paper
10.1016/j.nuclphysbps.2011.06.01
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. To what extent this issue affects existing analyses and our own work will require further study.
Boito Diogo R.
Cata Oscar
Golterman Maarten
Jamin Matthias
Maltman Kim
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