  Numerous experiments currently underway offer the potential to indirectly
probe new charged particles with masses at the weak scale. For example, the
tentative excess in Higgs diphoton decay and the tentative gamma-ray line in
Fermi-LAT data have recently attracted attention as possible one-loop
signatures of new charged particles. We explore the interplay between such
signals, dark matter direct detection through Higgs exchange, and measurements
of the electron EDM, by studying the size of these effects in several models.
We compute one-loop effects to explore the relationship among couplings probed
by different experiments. In particular, models in which dark matter and the
Higgs both interact with charged particles at a detectable level typically
induce, at loop level, couplings between dark matter and the Higgs that are
around the level of current direct detection sensitivity. Intriguingly,
one-loop Higgs diphoton decay and DM annihilation into two photons, two-loop
EDMs, and loop-induced direct detection rates are all coming within range of
existing experiments for approximately the same range of charged particle
masses, offering the prospect of an exciting coincidence of signals at
collider, astrophysical, underground and atomic physics measurements.
