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

Abstract

The KLOE experiment at the DA$\Phi$NE $\varphi$-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb${}^{-1}$ and extraction of the $\pi \pi$ contribution to $a_{\mu }$ in the mass range $0.35<M_{\pi \pi }^2<0.95$ GeV${}^2$ are presented. The new value of $a_{\mu }^{\pi \pi }$ has smaller (30%) statistical and systematic error and is consistent with the KLOE published value (confirming the current disagreement between the standard model prediction for $a_{\mu }$ and the measured value).

5 pages, proceedings for the CIPANP 2009 conference

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