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

  • Francesco D’EramoEmail author
  • Bradley J. Kavanagh
  • Paolo Panci
Open Access
Regular Article - Theoretical Physics

Abstract

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.

Keywords

Beyond Standard Model Renormalization Group 

Notes

Open Access

This article is distributed under the terms of the Creative Commons Attribution License (CC-BY 4.0), which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

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Copyright information

© The Author(s) 2016

Authors and Affiliations

  • Francesco D’Eramo
    • 1
    • 2
    Email author
  • Bradley J. Kavanagh
    • 3
    • 4
  • Paolo Panci
    • 5
  1. 1.Department of PhysicsUniversity of California Santa CruzSanta CruzUSA
  2. 2.Santa Cruz Institute for Particle PhysicsSanta CruzUSA
  3. 3.Laboratoire de Physique Théorique et Hautes Energies, CNRS, UMR 7589ParisFrance
  4. 4.Institut de Physique ThéoriqueUniversité Paris Saclay, CNRS, CEAGif-sur-Yvette CedexFrance
  5. 5.Institut d’Astrophysique de Paris, UMR 7095 CNRSUniversité Pierre et Marie CurieParisFrance

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