Dark Forces Searches at KLOE-2

TL;DR

The paper reports on dark matter searches at KLOE-2, focusing on the hypothetical U boson in the 50 MeV to 1 GeV mass range, setting upper limits on its coupling to the Standard Model.

Contribution

It presents new experimental limits on the U boson coupling based on KLOE-2 data, covering multiple decay channels and models.

Findings

Upper limits on U boson coupling established

Searches conducted in Dalitz decays and continuum events

Results constrain dark matter interaction models

Abstract

Direct searches of dark matter are performed at accelerator facilities. The existence of a new vector boson has been postulated in different scenarios where in the most basic scheme the coupling to the SM can be achieved via a kinetic mixing term due to the U boson. The KLOE experiment at DA$\phi$NE searched for the U boson both in Dalitz decays of the $\phi$ meson and in continuum events. For all of these searches an upper limit for the U boson coupling $\epsilon^{2}$ has been established in the mass range $50 \, \text{MeV} < m_U < 1000\,\text{MeV}$. A summary of the different models and searches along with results are presented.