Journal of High Energy Physics

, 2019:138 | Cite as

One-loop contribution to dark-matter-nucleon scattering in the pseudo-scalar dark matter model

  • Duarte Azevedo
  • Mateusz Duch
  • Bohdan Grzadkowski
  • Da Huang
  • Michal Iglicki
  • Rui SantosEmail author
Open Access
Regular Article - Theoretical Physics


Recent dark matter (DM) direct searches place very stringent constraints on the possible DM candidates proposed in extensions of the Standard Model. There are however models where these constraints are avoided. One of the simplest and most striking examples comes from a straightforward Higgs-portal pseudo-scalar DM model featured with a softly broken U(1) symmetry. In this model the tree-level DM-nucleon scattering cross section vanishes in the limit of zero momentum transfer. It has also been argued that the leading-order DM-nucleon cross section appears at the one-loop level. In this work we have calculated the exact cross section in the zero momentum transfer at the leading order i.e., at the one-loop level of perturbative expansion. We have concluded that, in agreement with expectations, the amplitude for the scattering process is UV finite and approaches zero in the limit of vanishing DM masses. Moreover, we made clear that the finite DM velocity correction at tree level is subdominant with respect to the one-loop contribution. Based on the analytic formulae, our numerical studies show that, for a typical choice of model parameters, the DM nuclear recoiling cross section is well below \( \mathcal{O} \)(10−50 cm2), which indicates that the DM direct detection signal in this model naturally avoids present strong experimental limits on the cross section.


Beyond Standard Model Higgs Physics 


Open Access

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Copyright information

© The Author(s) 2019

Authors and Affiliations

  1. 1.Faculty of PhysicsUniversity of WarsawWarsawPoland
  2. 2.Centro de Física Teórica e Computacional, Faculdade de CiênciasUniversidade de LisboaLisboaPortugal

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