Bounds on Dipole Moments of hidden Dark Matter through kinetic mixing
Abstract
The existence of dark sectors, consisting of weakly-coupled particles that do not interact with the known Standard Model forces, is theoretically and phenomenologically motivated. The hidden particles are candidates for Dark Matter and can interact with photon through electric dipole moment (EDM) and magnetic dipole moment (MDM). We investigate the possibility a hidden sector's Dark Matter which is charged under a hidden U(1)X gauge symmetry can interact with photon at loop level. We evaluate the scattering cross section of hidden Dirac fermion with nuclei and set bounds for dipole moment. Using the results of the XENON1T experiment for direct detection of Dark Matter, we get bounds of electromagnetic dipole moment (μ) for mass m=100 GeV : 1.93448 × 10-8μB ≤ μ ≤ 1.9496 × 10-8μB and electric dipole moment (d): 3.3204 × 10-23e.cm ≤ d ≤ 3.3464 × 10-23e.cm. Using the condition of the existence of dipole moment we constraint the kinetic mixing parameter 3× 10-3 ≤ ε ≤ 10-2 and the mass of the hidden U(1)X gauge boson to be in the range of 5 GeV ≤ mX ≤ 9 GeV. Our results complement previous works and are within detection capability of LHC.