1. Dark matter electromagnetic dipoles: the WIMP expectation
- Author
-
Xun-Jie Xu and Thomas Hambye
- Subjects
Physics ,Nuclear and High Energy Physics ,Particle physics ,Cosmology and Nongalactic Astrophysics (astro-ph.CO) ,Photon ,Dark matter ,FOS: Physical sciences ,Fermion ,QC770-798 ,Cosmology of Theories beyond the SM ,Standard Model ,Dipole ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,WIMP ,UV completion ,Nuclear and particle physics. Atomic energy. Radioactivity ,Beyond Standard Model ,Magnetic dipole ,Astrophysics - Cosmology and Nongalactic Astrophysics - Abstract
We perform a systematic study of the electric and magnetic dipole moments of dark matter (DM) that are induced at the one-loop level when DM experiences four-fermion interactions with Standard Model (SM) charged fermions. Related to their loop nature these moments can largely depend on the UV completion at the origin of the four-fermion operators. We illustrate this property by considering explicitly two simple ways to generate these operators, from $t$- or $s$-channel tree-level exchange. Fixing the strength of these interactions from the DM relic density constraint, we obtain in particular a magnetic moment that, depending on the interaction considered, lies typically between $10^{-20}$ to $10^{-23}$ ecm or identically vanishes. These non-vanishing values induce, via photon exchange, DM-nucleus scattering cross sections that could be probed by current or near future direct detection experiments., 23 pages, 7 figures
- Published
- 2021