Abstract
General consequences of mass mixing between the ordinary boson and a relatively light boson, the “dark” , arising from a gauge symmetry, associated with a hidden sector such as dark matter, are examined. New effects beyond kinetic mixing are emphasized. mixing introduces a new source of low energy parity violation well explored by possible future atomic parity violation and planned polarized electron scattering experiments. Rare meson decays into (, ) and are found to already place tight constraints on the size of mixing. Those sensitivities can be further improved with future dedicated searches at and factories as well as binned studies of existing data. mixing can also lead to the Higgs decay , followed by and or “missing energy,” providing a potential hidden sector discovery channel at the Large Hadron Collider. An illustrative realization of these effects in a 2 Higgs doublet model is presented.
- Received 30 March 2012
DOI:https://doi.org/10.1103/PhysRevD.85.115019
© 2012 American Physical Society