V_us From Hadronic Tau Decays

Abstract

We study extractions of |V_us| based on finite energy sum rule (FESR) analyses of hadronic tau decay data. We show (i) that the ``(0,0) spectral weight'' implementation (proposed previously in the literature as a favorable version of this analysis) suffers from significant convergence problems, but (ii) that alternate implementations exist which bring these problems under control. Results based on present spectral data are shown to be in agreement with those of other approaches, though with, at present, somewhat larger experimental errors. Sub-1% determinations of |V_us| are also shown to be expected from these alternate analyses once tau data from the B factories becomes available.

4 pages, prepared for the proceedings of the 9th Conference on the Intersections of Particle and Nuclear Physics (CIPANP06), Westin Rio Mar Resort, Puerto Rico, May 30-June 3, 2006

References in corpus (40)

• The four-loop beta-function in Quantum Chromodynamics
• The Four-Loop QCD Beta-Function and Anomalous Dimensions
• The ratios of the light quark masses
• Measurement of the neutron lifetime using a gravitational trap and a low-temperature Fomblin coating
• Measurement of the Strong Coupling Constant and the Vector and Axial-Vector Spectral Functions in Hadronic Tau Decays
• Superallowed nuclear beta decays: A critical survey with tests of CVC and the standard model
• S-wave Kpi scattering in chiral perturbation theory with resonances
• Strangeness-changing scalar form factors
• Is the Unitarity of the quark-mixing-CKM-matrix violated in neutron $\beta$-decay?
• Renormalization group analysis of the tau-lepton decay within QCD
• Precise Determination of |V{us}| from Lattice Calculations of Pseudoscalar Decay Constants
• Radiative corrections to K_{l3} decays
• V_us and m_s from hadronic tau decays
• The K -> pi vector form factor at zero momentum transfer on the lattice
• Study of tau decays involving kaons, spectral functions and determination of the strange quark mass
• Constraints on Hadronic Spectral Functions From Continuous Families of Finite Energy Sum Rules
• New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio
• Decay constants, light quark masses and quark mass bounds from light quark pseudoscalar sum rules
• Measurements of the Absolute Branching Ratios for the Dominant KL Decays, the KL Lifetime, and Vus with the KLOE Detector
• Strange Quark Mass from the Invariant Mass Distribution of Cabibbo-Suppressed Tau Decays
• Perturbative Quark Mass Corrections to the Tau Hadronic Width
• 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
• Measurements of Semileptonic KL Decay Form Factors
• Strange Quark Mass from Tau Lepton Decays with O(alpha_s^3) Accuracy
• A Determination of the CKM Parameter |Vus|
• Mass Corrections to the Tau Decay Rate
• High statistic measurement of the K- -> pi0 e- nu decay form-factors
• Measurement of the Strange Spectral Function in Hadronic tau Decays
• Measurements of KL Branching Fractions and the CP Violation Parameter |eta+-|
• Measurement of the branching ratio of the decay KL -> pi e nu and extraction of the CKM parameter |Vus|
• Branching Fractions of tau Leptons to Three Charged Hadrons
• Measurement of the KL meson lifetime with the KLOE detector
• Problems With Extracting $m_s$ from Flavor Breaking in Hadronic $\tau$ Decays
• Measurement of K^0_e3 form factors
• On the longitudinal contributions to hadronic tau decay
• QCD Predictions for the Tau Hadronic Width: Determination of alpha_s(M_τ^2)
• 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

Cited by in corpus (11)

• The strong coupling and its running to four loops in a minimal MOM scheme
• |V_us| and m_s from hadronic tau decays
• A resolution of the inclusive flavor-breaking $\tau$ $|V_{us}|$ puzzle
• Tau Physics: Theory Overview
• QCD Description of Hadronic Tau Decays
• A Mixed Tau-Electroproduction Sum Rule for V_us
• Status of the Hadronic tau Decay Determination of |V_{us}|
• Joint Extraction of m_s and V_us from Hadronic Tau Decays
• Tau Physics 2006: Summary & Outlook
• TAU2012 Summary
• Recent Progress on Tau Lepton Physics