Abstract
In this paper we investigate the direct detections of Majorana dark matter (MDM) in vector portal. Considering that the tree-level scattering cross sections in these models are either dark matter velocity suppressed or spin-dependent, we calculate radiative corrections to the spin-independent cross section in effective field theory approach. Wilson coefficients of effective MDM-quark interactions are calculated at the one-loop level, and the Wilson coefficient of the effective MDM-gluon interaction is derived at the two-loop level. Numerical results show that current constraints can rule out a narrow mass range of MDM when tree-level contributions are considered, and the spin-independent cross section from radiative corrections is a few orders of magnitude smaller than the tree-level contributions.
Highlights
JHEP11(2019)013 techniques will not be able to distinguish the signal of dark matter from that of neutrinos if the signal lies below the neutrino floor
In this paper we investigate the direct detections of Majorana dark matter (MDM) in vector portal
Wilson coefficients of effective MDM-quark interactions are calculated at the one-loop level, and the Wilson coefficient of the effective MDM-gluon interaction is derived at the two-loop level
Summary
The simplified model contains a Majorana fermion χ and a new vector boson Vμ in addition to the SM particles. Where mχ is the dark matter mass, gV is the new gauge coupling. For interactions of new gauge boson with the SM particles, Vμ may couple to vector bilinears or axial-vector bilinears, or both, depending on the U(1) charge settings of the SM fermions. While in the model where two chiral components carry opposite U(1) charges, new gauge interactions will be gV fγμγ5f. If only one certain chirality component carries non-zero charge, new gauge interactions will be gV fγμPAVμf [48], where PA = PL or PR. Where gq = ζgV with ζ the U(1) hyper-charge of the quark q Free parameters in these models are mχ, mV , gV and ζ
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