Power corrections to alpha_s(M_τ),|V_{us}| and m_s

Abstract

We re-examine recent determinations of power corrections from tau-decay and confront the results with the existing ones from QCD spectral sum rules (QSSR). We conclude that contrary to the QSSR analysis, which lead to <alpha_s G^2>=(6.8+-1.3)10^{-2} GeV^4, tau-decay is not a good place for extracting the gluon condensate due to its extra alpha_s^2 coefficient which suppresses its contribution in this process. Results from e^+e^- sum rules and tau-decay: rho alpha_s<uu>^2= (4.5+-0.3)10^{-4}GeV^6, where rho=3.0+-0.2 confirm the deviation from the vacuum saturation estimate of the four-quark condensate."Non-standard" power corrections (direct instantons, duality violation and tachyonic gluon mass) beyond the SVZ-expansion, partially cancel out in the V+A hadronic tau-decay channel, which gives at order alpha_s^4: alpha_s(M_tau)=0.3249(29)_{ex}(75)_{th} leading to als(M_Z)|_tau=0.1192 (4)_{ex}(9)_{th},in remarkable agreement with (but more accurate than) alpha_s(M_Z)|_Z=0.1191(27)obtained at the same alpha_s^4 order from the Z-width and the global fit of electroweak data. Finally, the role of the tachyonic gluon mass in the determinations of |V_{us}|from tau-decay and of m_s from tau-decay, e^+e^- and (pseudo)scalar channels is emphasized.

Version to appear in PLB

References in corpus (35)

• Hadronic Z- and tau-Decays in Order alpha_s^4
• Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications
• Short-distance tachyonic gluon mass and 1/Q^2 corrections
• Estimates of the higher-order QCD corrections to R(s), R_τ and deep-inelasstic scattering sum rules
• Gluon condensate in charmonium sum rules with 3-loop corrections
• Heavy quarkonia mass-splittings in QCD: test of the $1/m$-expansion and estimates of $<{\alpha }_s{G}^2>$ and ${\alpha }_s$
• Renormalization group analysis of the tau-lepton decay within QCD
• The Determination of alpha_s from Tau Decays Revisited
• The non-perturbative groundstate of Q.C.D and the local composite operator A_mu^2
• V_us and m_s from hadronic tau decays
• QCD tests from $e^+e^- \rar I=1~$ hadrons data and implication on the value of ${\alpha }_s$ from $\tau$-decays
• Experimental Tests of Asymptotic Freedom
• Open Charm and Beauty Chiral Multiplets in QCD
• Hints on the power corrections from current correlators in x-space
• V-A hadronic tau decays : a laboratory for the QCD vacuum
• Unraveling duality violations in hadronic tau decays
• Lambda^2-contribution to the condensate in lattice gauge theory
• Strange-quark mass from combined e+e- and tau-decay data:test of the isospin symmetry and implications on epsilon'/εand m_{u,d}
• c,b quark masses and f_D_(s), f_B_(s) decay constants from pseudoscalar sum rules in full QCD to order alpha_s^2
• Model-independent determination of ${\overline{m}}_s$ from $\tau$-like inclusive decays in $e^{+}{e}^{-}$ and implications for the $\chi SB$-parameters
• Strange quark mass from e+e- revisited and present status of light quark masses
• Perturbative Quark Mass Corrections to the Tau Hadronic Width
• On Non Perturbative Corrections to the Potential for Heavy Quarks
• QCD Analysis of Hadronic $\tau$ Decays Revisited
• Determining the Strange Quark Mass in Cabibbo Suppressed Tau Lepton Decays
• Chiral Condensates, Q_7 and Q_8 Matrix Elements and Large-N_c QCD
• Gluon Condensate and Beyond
• Light Quark Masses 99
• The anomalous dimension of the gluon-ghost mass operator in Yang-Mills theory
• Gluon Condensate from Superconvergent QCD Sum Rule
• Separating perturbative and non-perturbative contributions to the plaquette
• Confinement and short distance physics
• Strange Quark, Tachyonic Gluon Masses and V_{us} from Hadronic Tau Decays
• The QCD analytic running coupling and chiral symmetry breaking
• Joint Extraction of m_s and V_us from Hadronic Tau Decays

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