Abstract
We consider a fermionic dark matter (DM) particle in renormalizable Standard Model (SM) gauge interactions in a simple t-channel model. The DM particle interactions with SM fermions is through the exchange of scalar and vector mediators which carry colour or lepton number. In the case of coloured mediators considered in this study, we find that if the DM is thermally produced and accounts for the observed relic density almost the entire parameter space is ruled out by the direct detection observations. The bounds from the monojet plus missing energy searches at the Large Hadron Collider are less stringent in this case. In contrast for the case of Majorana DM, we obtain strong bounds from the monojet searches which rule out DM particles of mass less than about a few hundred GeV for both the scalar and vector mediators.
Highlights
-1 eR γμ χR exchange of lepto-quark type spin-0 (S) or a spin-1 vector (V) particle
dark matter (DM) annihilation in the universe into SM particles would result in cosmic ray fluxes which can be observed by dedicated detectors
In this paper we have considered a fermionic DM particle in renormalizable SM gauge interactions in a simple t-channel model
Summary
The model consists of a single Dirac vector-like fermion χ interacting through the mediation of a scalar (S) or a vector boson (V μ) which carry a baryonic (colour) or leptonic index. Unlike the s-channel mediator where a single vector boson is required as a mediator, in a t-channel model one requires a different mediator for left-handed quark doublets and righthanded quark singlets of each generation. A UV-complete theory with scalar or vector mediators may be relatively easier to implement by endowing the flavour quantum number to the DM particles thereby releasing the mediators from the burden of carrying flavour and the need for gauging the flavour symmetry. In this case the mediators may carry colour as well as weak charges depending on whether it couples to DM and quarks or DM and leptons. [22] it has been shown that at arbitrary high energies, the use of simplified models at the LHC and at future colliders are generally valid, in particular the models which have SM gauge invariance
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