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

Abstract

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}]/Γ[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.

arXiv comment8 pages, 5 figures, prepared for the Proceedings of the 9th International Workshop on Tau Lepton Physics (Tau'06), Pisa, Italy

References in corpus (34)

• The Cosmological Parameters 2006
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The four-loop beta-function in Quantum Chromodynamics
• The Four-Loop QCD Beta-Function and Anomalous Dimensions
• Quark Mass Anomalous Dimension to alpha_s**4
• Strong Coupling Constant with Flavour Thresholds at Four Loops in the MS-bar Scheme
• Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications
• Scalar Correlator at O(alpha_s^4), Higgs Decay into b-quarks and Bounds on the Light Quark Masses
• S-wave Kpi scattering in chiral perturbation theory with resonances
• Hadronic Structure in the Decay ${\tau }^{-}\to {\pi }^{-}{\pi }^0{\nu }_{\tau }$
• Scalar K pi form factor and light quark masses
• Determination of m_s and |V_us| from hadronic tau decays
• Study of tau decays involving kaons, spectral functions and determination of the strange quark mass
• Light quark masses from scalar sum rules
• Constraints on Hadronic Spectral Functions From Continuous Families of Finite Energy Sum Rules
• High-precision determination of the light-quark masses from realistic lattice QCD
• Decay constants, light quark masses and quark mass bounds from light quark pseudoscalar sum rules
• Perturbative Quark Mass Corrections to the Tau Hadronic Width
• Strange Quark Mass from the Invariant Mass Distribution of Cabibbo-Suppressed Tau Decays
• The Strange Quark Mass From Flavor Breaking in Hadronic Tau Decays
• Improved Determination of the Electroweak Penguin Contribution to epsilon'/epsilon in the Chiral Limit
• QCD Condensates for the Light Quark V-A Correlator
• Strange Quark Mass from Tau Lepton Decays with O(alpha_s^3) Accuracy
• Mass Corrections to the Tau Decay Rate
• Measurement of the Strange Spectral Function in Hadronic tau Decays
• Determination of the strange quark mass from Cabibbo-suppressed tau decays with resummed perturbation theory in an effective scheme
• Determining the Strange Quark Mass in Cabibbo Suppressed Tau Lepton Decays
• Branching Fractions of tau Leptons to Three Charged Hadrons
• Problems With Extracting $m_s$ from Flavor Breaking in Hadronic $\tau$ Decays
• On the longitudinal contributions to hadronic tau decay
• QCD Predictions for the Tau Hadronic Width: Determination of alpha_s(M_τ^2)
• V_us From Hadronin Tau Decays
• Study of tau Decays to Four-Hadron Final States with Kaons
• The Strange Quark Mass, alpha_s and the Chiral Limit Electroweak Penguin Matrix Elements From Hadronic Tau Decay Data