Abstract
Pseudo-Goldstone dark matter coupled to the Standard Model via the Higgs portal offers an attractive framework for phenomenologically viable pseudo-scalar dark matter. It enjoys natural suppression of the direct detection rate due to the vanishing of the relevant (tree level) Goldstone boson vertex at zero momentum transfer, which makes light WIMP-like dark matter consistent with the strong current bounds. In this work, we explore prospects of detecting pseudo-Goldstone dark matter at the LHC, focusing on the vector boson fusion (VBF) channel with missing energy. We find that, in substantial regions of parameter space, relatively light dark matter ($m_\chi < 100$ GeV) can be discovered in the high luminosity run as long as it is produced in decays of the Higgs-like bosons.
Highlights
The dark matter (DM) puzzle remains one of the pressing issues in modern physics
It is important that this statement applies to massive pseudoGoldstone bosons, which allows one to use this mechanism to suppress direct detection rates of weakly interacting massive particle (WIMP)-like dark matter
We have studied the dark matter discovery prospects in the Higgs portal framework with pseudo-Goldstone DM
Summary
The dark matter (DM) puzzle remains one of the pressing issues in modern physics. Various particle physics models have been constructed which fit known properties of dark matter. The electroweak-scale dark matter models have come under increasing pressure from direct detection experiments which have so far found null results [1,2]. These constrain the nucleon-dark matter interactions at (effectively) zero momentum transfer. It is important that this statement applies to massive pseudoGoldstone bosons, which allows one to use this mechanism to suppress direct detection rates of WIMP-like dark matter. In this case, the nucleon-dark matter interaction arises at one loop level and satisfies the XENON1T bound naturally. We find that despite the strong constraints, light DM can be probed efficiently in the high luminosity run of the LHC
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