Constraints on the I=1 hadronic tau decay and e^+e^- --> hadrons data sets and implications for (g-2)_mu

Abstract

Sum rule tests are performed on the spectral data for (i) flavor 'ud' vector- current-induced hadronic tau decays and (ii) e^+ e^- hadroproduction, in the region below s~3-4 GeV^2, where discrepancies exist between the isospin- breaking-corrected charged and neutral current I=1 spectral functions. The tau data is found to be compatible with expectations based on high-scale alpha_s(M_Z) determinations, while the electroproduction data displays two problems. The results favor determinations of the leading order hadronic contribution to (g-2)_mu which incorporate hadronic tau decay data over those employing electroproduction data only, and hence a reduced discrepancy between experiment and the Standard Model prediction for (g-2)_mu.

14 pages, 4 figures. Additional information: rationale for weight choices, impact of long-distance EM corrections on tau data, impact on EM spectral integral problems of replacement of 2 pi, 4 pi data by equivalent tau data. Version to appear in Physics Letters B

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Cited by in corpus (11)

• The Physics of Hadronic Tau Decays
• The strong coupling and its running to four loops in a minimal MOM scheme
• The Dipion Mass Spectrum In e+e- Annihilation and tau Decay: A Dynamical (rho0, omega, phi) Mixing Approach
• Electron, muon and tau magnetic moments: a theoretical update
• Models of Isospin Breaking in the Pion Form Factor: Consequences for the Determination of Pi_{ρω}(m_rho^2) and (g-2)_mu/2
• Prospects for e+e- physics at Frascati between the phi and the psi
• A Mixed Tau-Electroproduction Sum Rule for V_us
• Isospin breaking corrections in $2\pi$ production in tau decays and $e^{+}{e}^{-}$ annihilation: consequences for the muon $g-2$ and CVC tests
• Tau data-driven evaluation of the Hadronic Vacuum Polarization
• OPE Constraints and the Leading Order Hadronic Contribution to (g-2)_mu
• Tau Data-Based Evaluations of the hadronic vacuum polarization contribution to the muon $g-2$