Abstract: We study a simplified model of top-flavoured dark matter in the framework of Dark Minimal Flavour Violation. In this setup the coupling of the dark matter flavour triplet to right-handed up-type quarks constitutes the only new source of flavour and CP violation. The parameter space of the model is restricted by LHC searches with missing energy final states, by neutral D meson mixing data, by the observed dark matter relic abundance, and by the absence of signal in direct detection experiments. We consider all of these constraints in turn, studying their implications for the allowed parameter space. Imposing the mass limits and coupling benchmarks from collider searches, we then conduct a combined analysis of all the other constraints, revealing their non-trivial interplay. Especially interesting is the combination of direct detection and relic abundance constraints, having a severe impact on the structure of the dark matter coupling matrix. We point out that future bounds from upcoming direct detection experiments, such as XENON1T, XENONnT, LUX-ZEPLIN, and DARWIN, will exclude a large part of the parameter space and push the DM mass to higher values.
Abstract: We investigate the phenomenology of a simplified model of
flavoured Dark Matter (DM), with a dark fermionic flavour triplet coupling to the left-handed SU(2)L quark doublets via a scalar
mediator. The DM-quark coupling matrix is assumed to constitute the only new source of flavour and CP violation, following the
hypothesis of Dark Minimal Flavour Violation. We analyse the constraints from LHC searches, from meson mixing data in the K, D, and
Bd,s meson systems, from thermal DM freeze-out, and from direct detection experiments. Our combined analysis shows that while the
experimental constraints are similar to the DMFV models with DM coupling to right-handed quarks, the multitude of couplings between DM
and the SM quark sector resulting from the SU(2)L structure implies a richer phenomenology and significantly alters the resulting
impact on the viable parameter space.
