Search

The search for a dark sector mediated by a new gauge boson, the dark photon, is motivated by many astrophysical anomalies and by the g - 2 discrepancy. The KLOE experiment, operating at the e+e- DAϴNE collider in Frascati, searched for a visibly-decaying dark photon by investigating the ϕ-Dalitz decay into the η meson, the dark photon production from continuum, and the Higgsstrahlung process. The KLOE-2 run started in November 2014, after the upgrade of both, DAϴNE and the KLOE apparatus. In particular, two high electron and positron tagger stations were installed in the DAϴNE layout to study ΥΥ interactions at 1 GeV. Progress status of the project is given. [ABSTRACT FROM AUTHOR]

e+e- collider experiments at the intensity frontier are naturally suited to probe the existence of a force beyond the Standard Model between WIMPs, the most viable dark matter candidates. The mediator of this new force, known as dark photon, should be a new vector gauge boson very weakly coupled to the Standard Model photon. No significant signal has been observed so far. I will report on current limits set on the coupling factor ε² between the photon and the dark photon by e+e- collider experiments. [ABSTRACT FROM AUTHOR]