Abstract
We consider the extension of the Standard Model with scalar leptoquarks as a portal to dark matter (DM), motivated by the recent anomalies in semi-leptonic B-meson decays. Taking singlet and triplet scalar leptoquarks as the best scenarios for explaining B-meson anomalies, we discuss the phenomenological constraints from rare meson decays, muon (g − 2)μ, and leptoquark searches at the Large Hadron Collider (LHC). Introducing leptoquark couplings to scalar dark matter, we find that the DM annihilations into a pair of leptoquarks open a wide parameter space, being compatible with XENON1T bound, and show that there is an interesting interplay between LHC leptoquark searches and distinct signatures from cascade annihilations of dark matter.
Highlights
Dark matter (DM) is known to occupy about 85% of the total matter density in the Universe, and there are a variety of evidences for the existence of dark matter such as galaxy rotation curves, gravitational lensing, large scale structure, etc
Introducing leptoquark couplings to scalar dark matter, we find that the DM annihilations into a pair of leptoquarks open a wide parameter space, being compatible with XENON1T bound, and show that there is an interesting interplay between Large Hadron Collider (LHC) leptoquark searches and distinct signatures from cascade annihilations of dark matter
We show that sizable leptoquark couplings to dark matter lead to new annihilation channels of dark matter into a pair of leptoquarks, opening a wide parameter space where the correct relic density can be explained, being compatible with the direct detection bounds from XENON1T
Summary
It is known that SU(2)L singlet and triplet scalar leptoquarks can explain RD(∗) and RK(∗) anomalies, respectively [27, 28]. (See also refs. [26, 29, 30, 32].) Thus, in this section, focusing on those scalar leptoquark models, we discuss the phenomenological constraints coming from the B-meson anomalies.
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