Abstract
We develop the phenomenology of scenarios in which a dark matter candidate interacts with a top quark through flavour-changing couplings, employing a simplified dark matter model with an s-channel vector-like mediator. We study in detail the top-charm flavour-changing interaction, by investigating the single top plus large missing energy signature at the LHC as well as constraints from the relic density and direct and indirect dark matter detection experiments. We present strategies to distinguish between the top-charm and top-up flavour-changing models by taking advantage of the lepton charge asymmetry as well as by using charm-tagging techniques on an extra jet. We also show the complementarity between the LHC and canonical dark matter experiments in exploring the viable parameter space of the models.
Highlights
Couplings can arise in Z models [2,3,4] and in the flavoured DM paradigm [5,6,7,8,9,10,11,12,13,14], where the DM candidate belongs to a sector which is responsible to explain the flavour structure in the SM
Flavour non-universal yet diagonal DM models characterised by the four-fermion interaction between a DM pair and a top-quark pair have been studied in an effective field theory (EFT) approach [15,16,17] and searched for in a top-quark pair plus missing energy final state at the LHC Run-I [18, 19]
Before turning to the detailed study of the phenomenology of the DM model, we introduce the corresponding EFT description to briefly mention the relation to the simplified model and its validity
Summary
We start this section by describing simplified models for top flavour-changing DM and discussing the possible signatures. We give some remarks about the similarities and differences of the signatures between the top-up and top-charm flavour-changing models. We introduce the corresponding EFT description to briefly mention the relation with the simplified model and its validity
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