Lepton-flavoured scalar dark matter in Dark Minimal Flavour Violation

• Published in: The journal of high energy physics Vol. 2023; no. 5; pp. 106 - 31
• Main Authors: Acaroğlu, Harun, Agrawal, Prateek, Blanke, Monika
• Format: Journal Article
• Language: English
• Published: Berlin/Heidelberg Springer Berlin Heidelberg 15-05-2023; Springer Nature B.V; SpringerOpen
• Subjects: Classical and Quantum Gravitation; Constraint modelling; Couplings; Dark matter; Dark Matter at Colliders; Density; Elementary Particles; Flavor (particle physics); Flavour Symmetries; High energy physics; Lepton Flavour Violation (charged); Leptons; Models for Dark Matter; P waves; Phenomenology; Physics; Physics and Astronomy; Quantum Field Theories; Quantum Field Theory; Quantum Physics; Regular Article - Theoretical Physics; Relativity Theory; Searching; String Theory; Symmetry; Dark Matter at Colliders; Models for Dark Matter; Flavour Symmetries; Lepton Flavour Violation (charged)
• ISSN: 1029-8479; 1029-8479
• DOI: 10.1007/JHEP05(2023)106

A
bstract
We study a simplified model of lepton-flavoured complex scalar dark matter set up in the Dark Minimal Flavour Violation framework. In this model the Standard Model is extended by a scalar dark matter flavour triplet and a charged fermionic mediator, through which dark matter couples to the right-handed charged leptons of the Standard Model. This interaction is parameterized by a new 3 × 3 coupling matrix
λ
. Consistent with the field content of the model, also the Standard Model’s approximate flavour symmetry is extended to include an additional global U(3) associated with the dark matter flavour triplet. In addition to the Standard Model Yukawa couplings, the new coupling matrix
λ
is assumed to constitute the only source that violates this extended symmetry. We analyse the parameter space of this model by investigating constraints from collider searches, lepton flavour violating decays, the observed dark matter relic density, and direct as well as indirect dark matter detection experiments. By performing a combined analysis of all constraints we find that restrictions from lepton flavour violating decays, the observed relic density and dark matter nucleon scattering are dominant. The combination of the latter two renders limits from collider searches irrelevant while indirect detection constraints are weak due to a
p
-wave suppression of the annihilation rate. We conclude that lepton-flavoured scalar dark matter has a rich phenomenology and is a viable dark matter candidate.