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

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

2009-12-07

arxiv.org/abs/0912.1248v1

Chin.Phys.C34:698-704,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

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

Scientific paper

10.1088/1674-1137/34/6/015

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 ${\rm Br}(\tau \ra \pi \pi \nu_\tau)$, while the spectum lineshape is in agreement with expectations from $e^+ e^-$ annihilations.

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