V_us From Hadronin Tau Decays

Abstract

We study the reliability of extractions of |V_{us}| based on flavor-breaking hadronic tau decay sum rules. The ``(0,0) spectral weight'', proposed previously as a favorable candidate for this extraction, is shown to produce results having poor stability with respect to s_0, the upper limit on the relevant spectral integral, suggesting theoretical errors much larger than previously anticipated. We argue that this instability is due to the poor convergence of the integrated D=2 OPE series. Alternate weight choices designed to bring this convergence under better control are shown to produce significantly improved stability, and determinations of |V_{us}| which are both mutually compatible, and consistent, within errors, with values obtained by other methods.

12 pages

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Cited by in corpus (21)

• The Physics of the B Factories
• Precision Tau Physics
• Flavor Physics in the Quark Sector
• The strong coupling and its running to four loops in a minimal MOM scheme
• Exclusive branching fraction measurements of semileptonic tau decays into three charged hadrons, ${\tau }^{-}\to \varphi {\pi }^{-}{\nu }_{\tau }$ and ${\tau }^{-}\to \varphi K^{-}{\nu }_{\tau }$
• Determination of the Chiral Couplings L_10 and C_87 from Semileptonic Tau Decays
• |V_us| and m_s from hadronic tau decays
• Predicting the tau strange branching ratios and implications for V_{us}
• A resolution of the inclusive flavor-breaking $\tau$ $|V_{us}|$ puzzle
• Tau Physics: Theory Overview
• Precision physics with inclusive QCD processes
• 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}|
• A critical look at V_us determinations from hadronic tau decay data
• Joint Extraction of m_s and V_us from Hadronic Tau Decays
• Tau Physics 2006: Summary & Outlook
• Renormalization group improved $m_s$ and $|V_{us}|$ determination from hadronic $\tau$ decays
• Recent Progress on Tau Lepton Physics
• From hadronic tau decays to the chiral couplings L_10 and C_87
• The Joint Extraction of m_s and V_us From Hadronic Tau Decay Data