Flavoured Dark Matter Moving Left

TL;DR

This paper explores a flavoured Dark Matter model with left-handed quark couplings, analyzing constraints from collider, meson mixing, and detection experiments, revealing a richer phenomenology than right-handed models.

Contribution

It introduces a simplified flavoured Dark Matter model with left-handed couplings, expanding the phenomenological implications beyond previous right-handed coupling models.

Findings

Constraints from LHC and meson mixing are similar to right-handed models.

The $SU(2)_L$ structure leads to more complex DM-quark interactions.

The viable parameter space is significantly affected by the new couplings.

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 $B_{d,s}$ 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.