Loop-induced direct detection signatures from CP-violating scalar mediators

Fatih Ertas, Felix Kahlhoefer
2019 Journal of High Energy Physics  
We investigate direct detection signatures of dark matter particles interacting with quarks via a light spin-0 mediator with general CP phases. Since tree-level scattering may be strongly suppressed in the non-relativistic limit, loop contributions play an important role and can lead to observable signals in near-future experiments. We study the phenomenology of different mediator masses and CP phases with an emphasis on scenarios with maximal CP violation and Higgs portal models. Intriguingly,
more » ... dels. Intriguingly, the sum of the rates obtained at tree-and loop-level can give a characteristic recoil spectrum not obtainable from a single type of interaction. We furthermore develop a novel method for decomposing the two-loop contribution to effective interactions between dark matter and gluons into two separate one-loop diagrams, which in our case substantially simplifies the calculation of the important top-quark contribution.
doi:10.1007/jhep06(2019)052 fatcat:7flqcecaa5fdnfpghi45xpng24