The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data

Details The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data

2006-11-13

arxiv.org/abs/hep-ph/0611180v1

Nucl.Phys.Proc.Suppl.169:90-97,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 5 figures, prepared for the Proceedings of the 9th International Workshop on Tau Lepton Physics (Tau'06), Pisa, Italy

Scientific paper

10.1016/j.nuclphysbps.2007.02.05

We discuss the simultaneous determination of m_s and V_us from flavor-breaking hadronic tau decay sum rules, focussing on weight choices designed to better control problems associated with the slow convergence of the relevant integrated D=2 OPE series. The results are found to display improved stability and consistency relative to those of conventional analyses based on the ``(k,0) spectral weights''. The results for m_s agree well with those of recent strange scalar sum rule and strange pseudoscalar sum rule and lattice analyses. Results for V_us agree within errors with those of lattice-input-based K_{ell 3} and Gamma [K_{mu 2}]/\Gamma [pi_{mu 2}] analyses. Very significant error reductions are shown to be expected, especially for V_us, once improved strange spectral data from the B factory experiments becomes available.

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