Secluded U(1) below the weak scale

A secluded U(1) sector with weak admixture to photons, $O({10}^{\ensuremath{-}2}\ensuremath{-}{10}^{\ensuremath{-}3})$, and the scale of the breaking below 1 GeV represents a natural yet poorly constrained extension of the standard model. We analyze $g\ensuremath{-}2$ of muons and electrons together with other precision QED data, as well as radiative decays of strange particles to constrain the mass-mixing angle (${m}_{V}\ensuremath{-}\ensuremath{\kappa}$) parameter space. We point out that ${m}_{V}\ensuremath{\simeq}214\text{ }\text{ }\mathrm{MeV}$ and ${\ensuremath{\kappa}}^{2}>3\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}5}$ can be consistent with the hypothesis of the HyperCP Collaboration,…

• GO
  Government of Canada
• IP
  Institut Périmètre de physique théorique
• NS
  Natural Sciences and Engineering Research Council of Canada