Orateur
Description
When revisiting studies of effective interactions between fermionic dark matter and photons, we noticed that previous treatments violate gauge invariance, which, as is usual, has huge consequences. In arXiv:2005.12789 we address this and present an update on the collider, direct and indirect experimental constraints for operators of dimension 5 and 6. Unlike previous works, we stress the important effect gauge invariance has on dark matter even when its mass is well below the electroweak scale. This leads to a better picture of what we can reasonably expect from future dark matter searches. One particular insight is that anapole dark matter is unlikely to be seen soon in direct detection experiments because gauge invariance suggests that the constraints coming from the invisible width of the Z-boson are much stronger.
