Alpha_s(M_Z) from hadronic tau decays

Abstract

We perform an extraction of alpha_s based on sum rules involving isovector hadronic tau decay data. The particular sum rules employed are constructed specifically to suppress contributions associated with poorly known higher dimension condensates, and hence reduce theoretical systematic uncertainties associated with the treatment of such contributions which are shown to be present in earlier related analyses. Running our results from the n_f=3 to n_f=5 regime we find alpha_s(M_Z^2)=0.1187(16), in excellent agreement with the recently updated global fit to electroweak data at the Z scale, 0.1191(27), and other high-scale direct determinations.

30 pages, 3 figures. Published version. Minor rearrangements and subdivision of longer sections into subsections for ease of reading

References in corpus (13)

• Hadronic Z- and tau-Decays in Order alpha_s^4
• A precise determination of alpha_s from LEP thrust data using effective field theory
• An improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi beta decay
• Heavy Quark Masses from Sum Rules in Four-Loop Approximation
• The Determination of alpha_s from Tau Decays Revisited
• First determination of the strong coupling constant using NNLO predictions for hadronic event shapes in e^+e^- annihilations
• Unraveling duality violations in hadronic tau decays
• Q_EC values of the Superallowed beta Emitters 50Mn and 54Co
• Extraction of alpha_s from radiative Upsilon(1S) decays
• Determination of QCD condensates from tau-decay data
• Precision measurements of alphas at HERA
• First Observation of the Decay tau^- -> phi K^- nu_tau
• Determination of the strong coupling constant from the CLEO measurement of the total hadronic cross section in $e^{+}{e}^{-}$ annihilation below 10.56 GeV

Cited by in corpus (10)

• K pi vector form factor, dispersive constraints and tau -> nu_tau K pi decays
• The Realistic Lattice Determination of alpha_s(M_Z) Revisited
• Possible duality violations in tau decay and their impact on the determination of alpha_s
• On the determination of alpha_s from hadronic tau decays with contour-improved, fixed order and renormalon-chain perturbation theory
• Status of the Hadronic tau Decay Determination of |V_{us}|
• Recent theoretical progress in perturbative QCD
• Estimate of the systematic error in tau decay due to duality violations
• Contribution from Duality Violations to the theoretical error on alpha_s
• From hadronic tau decays to the chiral couplings L_10 and C_87
• The determination of alpha_s(M_z) from perturbative analyses of short-distance-sensitive lattice QCD observables revisited