Speaker
Gerald Eigen
(University of Bergen (NO))
Description
We report on a search for single-photon events in 53 fb$^{-1}$ of data collected with the BABAR detector. We look for events consistent with production of a dark photon ($A^\prime$) through the process $e^+e^- \to \gamma A^\prime$, $A^\prime \to$ invisible. Such particles are motivated by theories applying a $U(1)$ gauge symmetry to dark matter. We find no evidence for this process and set limits on the $A^\prime$-photon coupling for a dark photon mass below 8 GeV. These results greatly improve upon previous bounds, and exclude the range of values suggested by the dark-photon interpretation of the muon $(g-2)$ anomaly
Primary authors
Fabio Anulli
(Sapienza Universita e INFN, Roma I (IT))
Gerald Eigen
(University of Bergen (NO))
