Natural explanation for 130 GeV photon line within vector boson dark matter model

Abstract

We present a dark matter model for explaining the observed 130 GeV photon line from the galaxy center. The dark matter candidate is a vector boson of mass m V with a dimensionless coupling to the photon and Z boson. The model predicts a double line photon spectrum at energies equal to m V and m V (1 − m 2 Z /4m 2 V ) originating from the dark matter annihilation. The same coupling leads to a mono-photon plus missing energy signal at the LHC. The entire perturbative parameter space can be probed by the 14 TeV LHC run. The model has also a good prospect of being probed by direct dark matter searches as well as the measurement of the rates of h → γγ and h → Zγ at the LHC.

Impact of the vector dark matter on polarization of the CMB photon

“…Therefore, the cases with the small VDM masses where the masses are near to each other lead to larger values for the CP generation due to the VDM-photon scattering. Nevertheless, the power spectrum C (S) V l of the CP depends on theκ τeγ through a complicated integral given in (45). However, the effects of different VDM masses on the optical depths ratioκ τeγ and the CP angular power spectrum l(l + 1)/(2π) C impact of the VDM-photon scattering on the CP generation for masses larger than 10keV in l = 0 and for the masses larger than 1keV in l = 2 are negligible.…”

“…Here, we would like to focus on a model given in [45] with a spin-1 bosonic vector-DM (VDM) which can directly couple to photon through a gauge invariant dimensionless coupling. As we know, the vector boson as the DM candidate has recently received much attention in various mass scales from a few eV to few TeV.…”

“…In [49] it is shown that a VDM with 20 − 40 GeV mass can provide an excellent description of the observed gamma-ray excess. In [45,50] a model with two different VDM candidates are considered in a GeV mass scale to explain 3.5 keV and 130 GeV photon lines. Meanwhile, there are many papers for the VDM in the low mass scale.…”

Vector Higgs-portal dark matter and Fermi-LAT gamma ray line

“…We note that in most of other previous works on vector WIMP, a vector boson was introduced as a Proca field [21][22][23] or a scalar sector is described by the nonlinear sigma model [24]. In our model, vector dark matter is realized as a gauge boson of extra U(1) symmetry when it is broken spontaneously by the VEV of the hidden Higgs field at the renormalizable level [22,25].…”

More on the hypercharge portal into the dark sector

“…Here we have assumed CP symmetry such that terms of the type B µν C µ D ν are not allowed (see [14] for a study of the latter). The kinetic and mass mixing can be eliminated by field…”