Augury of darkness: the low-mass dark Z portal

  • Alexandre Alves
  • Giorgio Arcadi
  • Yann Mambrini
  • Stefano Profumo
  • Farinaldo S. QueirozEmail author
Open Access
Regular Article - Theoretical Physics


Dirac fermion dark matter models with heavy Z mediators are subject to stringent constraints from spin-independent direct searches and from LHC bounds, cornering them to live near the Z resonance. Such constraints can be relaxed, however, by turning off the vector coupling to Standard Model fermions, thus weakening direct detection bounds, or by resorting to light Z masses, below the Z pole, to escape heavy resonance searches at the LHC. In this work we investigate both cases, as well as the applicability of our findings to Majorana dark matter. We derive collider bounds for light Z gauge bosons using the CL S method, spin-dependent scattering limits, as well as the spin-independent scattering rate arising from the evolution of couplings between the energy scale of the mediator mass and the nuclear energy scale, and indirect detection limits. We show that such scenarios are still rather constrained by data, and that near resonance they could accommodate the gamma-ray GeV excess in the Galactic center.


Cosmology of Theories beyond the SM Beyond Standard Model 


Open Access

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Copyright information

© The Author(s) 2017

Authors and Affiliations

  • Alexandre Alves
    • 1
  • Giorgio Arcadi
    • 2
  • Yann Mambrini
    • 3
  • Stefano Profumo
    • 4
    • 5
  • Farinaldo S. Queiroz
    • 2
    Email author
  1. 1.Departamento de FísicaUniversidade Federal de São PauloSão PauloBrasil
  2. 2.Max-Planck-Institut fur KernphysikHeidelbergGermany
  3. 3.Laboratoire de Physique Théorique, CNRS — UMR 8627, Université de Paris-Saclay 11Orsay CedexFrance
  4. 4.Department of PhysicsUniversity of California, Santa CruzSanta CruzU.S.A.
  5. 5.Santa Cruz Institute for Particle Physics, Santa CruzSanta CruzU.S.A.

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