Search for the U-boson in the process $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma ,U\to {\mu }^{+}{\mu }^{-}$ with the KLOE detector

Abstract

We present a search for a new light vector boson, carrier of a "dark force" between WIMPs, with the KLOE detector at \DA$\Phi$NE. We analyzed $e^{+}{e}^{-}\to {\mu }^{+}{\mu }^{-}\gamma$ ISR events corresponding to an integrated luminosity of $239$ pb${}^{-1}$ to find evidence for the $e^{+}{e}^{-}\to U\gamma ,U\to {\mu }^{+}{\mu }^{-}$ process. We found no $U$ vector boson signal and set a 90% CL upper limit on the ratio of the U boson and photon coupling constants between 1.6$\times 10^{-5}$ to 8.6$\times 10^{-7}$ in the mass region $520<M_{\mathrm{U}}<980$ MeV. A projection of the KLOE sensitivity for the $\mu \mu \gamma$ and $\pi \pi \gamma$ channels at full statistics and extended muon acceptance is also presented.

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