Dark Matter Blind Spots at One-Loop
Tao Han, Hongkai Liu, Satyanarayan Mukhopadhyay, Xing Wang

TL;DR
This paper investigates how one-loop electroweak corrections can reveal previously hidden dark matter detection signals in models with blind spots, especially in singlet-doublet fermion scenarios, enhancing prospects for future experiments.
Contribution
It provides the first detailed calculation of one-loop corrections to dark matter scattering in blind spot models, showing how these corrections can make detection feasible.
Findings
One-loop corrections can 'unblind' dark matter detection in certain models.
A new next-to-leading order blind spot is identified.
Predicted cross-sections reach up to a few times 10^{-47} cm^2.
Abstract
We evaluate the impact of one-loop electroweak corrections to the spin-independent dark matter (DM) scattering cross-section with nucleons (), in models with a so-called blind spot for direct detection, where the leading-order prediction for the relevant DM coupling to the Higgs boson, and therefore , are vanishingly small. Adopting a simple illustrative scenario in which the DM state results from the mixing of electroweak singlet and doublet fermions, we compute the relevant higher order corrections to the scalar effective operator contributions to , stemming from both triangle and box diagrams involving the SM and dark sector fields. It is observed that in a significant region of the singlet-doublet model-space, the one-loop corrections ``unblind'' the tree-level blind spots and lead to detectable SI scattering rates at future…
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