English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Recent dark matter (DM) direct searches place very stringent constraints onthe possible DM candidates proposed in extensions of the Standard Model. Thereare however models where these constraints are avoided. One of the simplest andmost striking examples comes from a straightforward Higgs portal pseudoscalarDM model featured with a softly broken $U(1)$ symmetry. In this model thetree-level DM-nucleon scattering cross section vanishes in the limit of zeromomentum-transfer. It has also been argued that the leading-order DM-nucleoncross-section appears at the one-loop level. %, which is too small to beconstrained experimentally. In this work we have calculated the exactcross-section in the zero momentum-transfer at the leading-order i.e., at theone-loop level of perturbative expansion. We have concluded that, in agreementwith expectations, the amplitude for the scattering process is UV finite andapproaches zero in the limit of vanishing DM masses. Moreover, we made clearthat the finite DM velocity correction at tree-level is subdominant withrespect to the one-loop contribution. Based on the analytic formulae, ournumerical studies show that, for a typical choice of model parameters, the DMnuclear recoiling cross section is well below ${\cal O}(10^{-50}~{\rm cm}^2)$,which indicates that the DM direct detection signal in this model naturallyavoids the present strong experimental limits on the cross-section.

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