You can hide but you have to run: direct detection with vector mediators

Francesco d'Eramo , Bradley J. Kavanagh (1) , Paolo Panci (2)

1 LPTHE - Laboratoire de Physique Théorique et Hautes Energies
2 IAP - Institut d'Astrophysique de Paris

We study direct detection in simplified models of Dark Matter (DM) in which interactions with Standard Model (SM) fermions are mediated by a heavy vector boson. We consider fully general, gauge-invariant couplings between the SM, the mediator and both scalar and fermion DM. We account for the evolution of the couplings between the energy scale of the mediator mass and the nuclear energy scale. This running arises from virtual effects of SM particles and its inclusion is not optional. We compare bounds on the mediator mass from direct detection experiments with and without accounting for the running. In some cases the inclusion of these effects changes the bounds by several orders of magnitude, as a consequence of operator mixing which generates new interactions at low energy. We also highlight the importance of these effects when translating LHC limits on the mediator mass into bounds on the direct detection cross section. For an axial-vector mediator, the running can alter the derived bounds on the spin-dependent DM-nucleon cross section by a factor of two or more. Finally, we provide tools to facilitate the inclusion of these effects in future studies: general approximate expressions for the low energy couplings and a public code runDM to evolve the couplings between arbitrary energy scales.

Mots clés: Beyond Standard Model; Renormalization Group; new physics; fermion: dark matter; dark matter: interaction; dark matter: coupling; coupling: energy dependence; dark matter: direct detection; vector boson: mediation; vector boson: exchange; vector boson: heavy; renormalization group; effective field theory; numerical calculations

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]; Astrophysique [astro-ph]; Physique des Hautes Energies - Expérience [hep-ex]

Francesco d'Eramo, Bradley J. Kavanagh, Paolo Panci. You can hide but you have to run: direct detection with vector mediators. Journal of High Energy Physics, 2016, 08, pp.111. ⟨10.1007/JHEP08(2016)111⟩. ⟨hal-01555014⟩