Can VMD improve the estimate of the muon g-2 ?

Abstract

We show that a VMD based theoretical input allows for a significantly improved accuracy for the hadronic vacuum polarization of the photon which contributes to the theoretical estimate of the muon g-2. We also show that the only experimental piece of information in the $\tau$ decay which cannot be accounted for is the accepted value for ${\rm Br}(τ\ra ππν_τ)$, while the spectum lineshape is in agreement with expectations from $e^{+}{e}^{-}$ annihilations.

6 pages, 1 figure Proceedings of the PhiPsi09, Oct. 13-16, 2009, Beijing, China

References in corpus (4)

• Reevaluation of the hadronic contribution to the muon magnetic anomaly using new e+e- -> pi+pi- cross section data from BABAR
• A Global Treatment Of VMD Physics Up To The $\varphi$: I. $e^{+}{e}^{-}$ Annihilations, Anomalies And Vector Meson Partial Widths
• A Global Treatment Of VMD Physics Up To The phi: II. tau Decay and Hadronic Contributions To g-2
• A precise new KLOE measurement of $|F_{\pi }{|}^2$ with ISR events and determination of $\pi \pi$ contribution to $a_{\mu }$ for $0.592<M_{\pi \pi }<0.975$ GeV

Cited by in corpus (3)

• (g-2)_mu and alpha(M_Z^2) re-evaluated using new precise data
• A Global Treatment Of VMD Physics Up To The phi: II. tau Decay and Hadronic Contributions To g-2
• The muon g-2 discrepancy: new physics or a relatively light Higgs?