Skip to main content

Research Repository

Advanced Search

B anomalies and dark matter: a complex connection

Cerdeño, D.G.; Cheek, A.; Martín-Ramiro, P.; Moreno, J.M.

B anomalies and dark matter: a complex connection Thumbnail


D.G. Cerdeño

A. Cheek

P. Martín-Ramiro

J.M. Moreno


We study an extension of the Standard Model that addresses the hints of lepton flavour universality violation observed in B→K(∗)l+l− decays at LHCb, while providing a viable candidate for dark matter. The model incorporates two new scalar fields and a Majorana fermion that induce one-loop contributions to B meson decays. We show that agreement with observational data requires the new couplings to be complex and that the Majorana fermion can reproduce the observed dark matter relic density. This combination of cosmological and flavour constraints sets an upper limit on the dark matter and mediator masses. We have studied LHC dijet and dilepton searches, finding that they rule out large regions of parameter space by setting lower bounds on the dark matter and mediator masses. In particular, dilepton bounds are much more constraining in a future high-luminosity phase. Finally, we have computed the scattering cross section of dark matter off nuclei and compared it to the sensitivity of current and future direct detection experiments, showing that parts of the parameter space could be accessible in the future to multi-ton experiments. Future collider and direct DM searches complement each other to probe large areas of the parameter space of this model.


Cerdeño, D., Cheek, A., Martín-Ramiro, P., & Moreno, J. (2019). B anomalies and dark matter: a complex connection. The European Physical Journal C, 79(6), Article 517.

Journal Article Type Article
Acceptance Date May 22, 2019
Online Publication Date Jun 17, 2019
Publication Date Jun 30, 2019
Deposit Date Jul 3, 2019
Publicly Available Date Jul 3, 2019
Journal European Physical Journal C: Particles and Fields
Print ISSN 1434-6044
Electronic ISSN 1434-6052
Publisher SpringerOpen
Peer Reviewed Peer Reviewed
Volume 79
Issue 6
Article Number 517


Published Journal Article (2.9 Mb)

Publisher Licence URL

Copyright Statement
© The Author(s) 2019. This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (, which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made.

You might also like

Downloadable Citations