Joint extraction of m_s and V_us from hadronic τ decays

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• 作者：Kim Maltman ; Carl E. Wolfe
• 刊名：Physics Letters B
• 出版年：2007
• 出版时间：21 June 2007
• 年：2007
• 卷：650
• 期：1
• 页码：27-32
• 全文大小：261 K

文摘

We study the simultaneous determination of m_s and V_us from flavor-breaking hadronic τ decay sum rules using weights designed to bring under better control problems associated with the slow convergence of the relevant D=2 OPE series. Much improved stability and consistency is found as compared to the results of conventional analyses based on the “(k,0) spectral weights”. Results for m_s are in excellent agreement with those of recent strange scalar and strange pseudoscalar sum rule analyses, as well as recent lattice analyses, while those for V_us agree within errors with the output from recent lattice-based Γ[K_μ2]/Γ[π_μ2] and K_ℓ3-based analyses. Very significant error reductions are shown to be expected, especially for V_us, once the improved strange spectral data from the B-factory experiments becomes available.