Abstract
Motivated by UV explanations of the B-physics anomalies, we study a dark sector containing a Majorana dark matter candidate and a coloured coannihilation partner, connected to the Standard Model predominantly via a U1 vector leptoquark. A TeV scale U1 leptoquark, which couples mostly to third generation fermions, is the only successful single-mediator description of the B-physics anomalies. After calculating the dark matter relic surface, we focus on the most promising experimental avenue: LHC searches for the coloured coannihilation partner. We find that the coloured partner hadronizes and forms meson-like bound states leading to resonant signatures at colliders reminiscent of the quarkonia decay modes in the Standard Model. By recasting existing dilepton and monojet searches we exclude coannihilation partner masses less than 280 GeV and 400 GeV, respectively. Since other existing collider searches do not significantly probe the parameter space, we propose a new dedicated search strategy for pair production of the coloured partner decaying into bbττ final states and dark matter particles. This search is expected to probe the model up to dark matter masses around 600 GeV with current luminosity.
Highlights
At the high-energy frontier, no definite Beyond the SM (BSM) signals have emerged from the full set of run-II LHC data
Motivated by UV explanations of the B-physics anomalies, we study a dark sector containing a Majorana dark matter candidate and a coloured coannihilation partner, connected to the Standard Model predominantly via a U1 vector leptoquark
Assuming that the leptoquark is a gauge boson of a spontaneously broken gauge symmetry, and that dark matter is a fermion contained in a multiplet of that symmetry, the dark sector will contain a coloured coannihilation partner
Summary
We will study a simplified model, we first motivate Majorana dark matter coannihilating with a slightly heavier colour triplet partner from a UV perspective. Under the SM group SU(3)c × SU(2)L × U(1)Y the dark sector states will have the representations χ ∼ (1, 1, 0) , ψ ∼ (3, 1, 2/3) ,. Couple directly to the vector leptoquark U1 ∼ (3, 1, 2/3). There are two main ways of accounting for a multi-TeV vector leptoquark: gauge models and strongly interacting models [28]. In this work we will assume a gauge model explanation, where the leptoquark is a massive gauge boson associated with the spontaneous breaking of a gauge symmetry, GNP ⊃ GSM
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