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

Understand

Dark Matter and Dark Energy are two of the most fundamental open questions in physics today.

• The existence of a light dark-force mediator has been hypothesized as a possible explanation for several unexplained physical phenomena.
• A new search for this mediator, the dark photon $U$, is underway using data collected with the KLOE detector at DA$\Phi$NE.
• We describe the strategy we will use in our search for a resonant peak in the electron-positron invariant mass spectrum from the process $e^+e^- \to U \gamma$ with $U \to e^+e^-$.