Search for Invisible Decays of a Dark Photon Produced in e
Phys Rev Lett
; 119(13): 131804, 2017 Sep 29.
Article
in En
| MEDLINE
| ID: mdl-29341718
ABSTRACT
We search for single-photon events in 53 fb^{-1} of e^{+}e^{-} collision data collected with the BABAR detector at the PEP-II B-Factory. We look for events with a single high-energy photon and a large missing momentum and energy, consistent with production of a spin-1 particle A^{'} through the process e^{+}e^{-}âγA^{'}; A^{'}âinvisible. Such particles, referred to as "dark photons," are motivated by theories applying a U(1) gauge symmetry to dark matter. We find no evidence for such processes and set 90% confidence level upper limits on the coupling strength of A^{'} to e^{+}e^{-} in the mass range m_{A^{'}}≤8 GeV. In particular, our limits exclude the values of the A^{'} coupling suggested by the dark-photon interpretation of the muon (g-2)_{µ} anomaly, as well as a broad range of parameters for the dark-sector models.
Full text:
1
Database:
MEDLINE
Type of study:
Prognostic_studies
Language:
En
Year:
2017
Type:
Article