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Nguyen, G. Bencivenni, G. De Robertis, G. Fanizzi, G. Felici, G. Giardina, G. Mandaglio, G. Morello, G. Venanzoni, I. Balwierz-Pytko, I. Prado Longhi, I. Sarra, J. Lee-Franzini, J. Zdebik (KLOE-2 Collaboration), K. Kacprzak, L. Caldeira Balkest\\r{a}hl, L. Heijkenskjold, L. Tortora, M. Martemianov, M. Martini, M. Mascolo, M. Schioppa, M. Silarski, M. Wolke, O. Erriquez, P. Branchini, P. Ciambrone, P. De Simone, P. Franzini, P. Gauzzi, P. Moskal, P. Santangelo, R. Di Salvo, R. Messi, S. Fiore, S. Giovannella, S. Loffredo, S. Miscetti, T. Johansson, V. De Leo, V. Patera, W. Krzemien, W. Wislicki","submitted_at":"2014-04-30T16:00:07Z","abstract_excerpt":"We have searched for a light vector boson $U$, the possible carrier of a \"dark force\", with the KLOE detector at the DA$\\Phi$NE \\epm\\ collider, motivated by astrophysical evidence for the presence of dark matter in the universe. Using \\epm\\ collisions collected with an integrated luminosity of $239.3$~pb$^{-1}$, we look for a dimuon mass peak in the reaction \\epm\\to$\\mu^+ \\mu^-$\\gam, corresponding to the decay $U\\to\\mu^+\\mu^-$. We find no evidence for a $U$ vector boson signal. 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