Abstract
We perform a detailed study of the dark Z' portal using a generic parametrization of the Z'-quarks couplings, both for light (8-15)GeV and heavy (130-1000)GeV dark matter scenarios. We present a comprehensive study of the collider phenomenology including jet clustering, hadronization, and detector artifacts, which allows us to derive accurate bounds from the search for new resonances in dijet events and from mono-jet events in the LHC 7TeV, LHC 8TeV, and Tevatron 1.96 TeV data. We also compute the dark matter relic abundance, the relevant scattering cross sections and pair-annihilation spectrum, and compare our results with the current PLANCK, Fermi-LAT and XENON100/LUX bounds. Lastly, we highlight the importance of complementary searches for dark matter, and outline the excluded versus still viable parameter space regions of the dark Z' portal.
Highlights
Either by a ∼ 8 GeV DM particle annihilating into τ +τ − or a ∼ 25 GeV one annihilating mostly into bb [21,22,23,24,25,26]
While portions of that resonance are highly constrained by collider searches and by indirect searches, we find interesting portions of parameter space that are viable and that feature the correct thermal relic density
It is important to emphasize that in the regime the Z is lighter than the dark matter particle, the collider and direct detection bounds are ameliorated because the large couplings to quarks are no longer required by the abundance since the DM particles can annihilate to pairs of Z bosons
Summary
Either by a ∼ 8 GeV DM particle annihilating into τ +τ − or a ∼ 25 GeV one annihilating mostly into bb [21,22,23,24,25,26]. An exciting 130 GeV gamma-ray line observed in the Fermi-LAT data and reported by different groups [32,33,34,35,36,37,38,39], might potentially be associated with the two-photon annihilation of a 130 GeV DM particle, but might reflect an instrumental effect. Be it as it may, those different indirect detection signals are quite interesting and promising and are expected to be settled in either direction in the near future. We outline the viable parameter space in the Z mass Z − DM − DM plane, after plugging into the most relevant colliders (LHC 8,LHC 7, Tevatron 1.96 TeV), direct (LUX,XENON100) and indirect (Fermi Dwarfs) limits
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