2-7 June 2016
Auditorium Maximum
Europe/Warsaw timezone
14th International Workshop on Meson Production, Properties and Interaction
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Contribution parallel talk

Auditorium Maximum - Medium lecture hall (A)

Search for dark forces with KLOE

Collaboration

KLOE2

Abstract content

During the last years several Dark Sector Models have been proposed in order to address striking astrophysical observations which failed standard intepretations. In the minimal case a new vector particle, the so called dark photon or $U$ boson, is introduced, with small coupling with Standard Model particles. Also, the existence of a dark Higgs boson $h'$ is postulated, in analogy with the Standard Model, to give mass to the $U$ boson through the Spontaneous Symmetry Breaking mechanism.

The experiment KLOE, working on the DAFNE $e^+e^-$ collider in Frascati, searched for the existence of the $U$ boson in a quite complete way, investigating three different processes and six different final states:

  • in dalitz decays of the $\phi$ meson $\phi \to \eta U$, with $U\to e^+e^-$ and $\eta\to \pi^+\pi^-\pi^0$ and $\pi^0\pi^0\pi^0$
  • in $e^+e^- \to U \gamma$ events, with $U$ decaying to electron, muon and pion pairs
  • in the dark Higgsstrahlung process, $e^+e^- \to Uh'$, $U\to \mu^+\mu^-$, $h'$ invisible.

Tight limits on the model parameters have been set at 90% CL. Further improvements are expected in terms of sensitivity and discovery potential with the new KLOE2 detector working on the improved DAFNE $e^+e^-$ collider.