Strongly first order phase transition in the singlet fermionic dark matter model after LUX

Understand

We investigate an extension of the standard model (SM) with a singlet fermionic dark matter (DM) particle which interacts with the SM sector through a real singlet scalar.

• The presence of a new scalar provides the possibility of generating a strongly first order phase transition needed for electroweak baryogenesis.
• Taking into account the latest Higgs search results at the LHC and the upper limits from the DM direct detection experiments especially that from the LUX experiment, and combining the constraints from the LEP experiment and the electroweak precision test, we explore the parameter space of this model which can lead to the strongly first order phase transition.
• Both the tree- and loop-level barriers are included in the calculations.