The B anomalies, the U₁ leptoquark and dark matter

The present-day B-anomalies involving b -> s mu(+)mu(-) or b -> c tau(-)nu & macr; transitions can all be explained with the addition of a vector U1 leptoquark with a mass of M-U1 ? 1.8 TeV. In the scalar singlet dark matter model (SSDMM), the DM is a scalar S that couples to the Higgs via lambda(hS) S-2|H|(2). We update the fit to the data and find that the SSDMM is now viable only for M-S ? 1.6 TeV. In this paper, we assume that the DM also couples to the U-1 via lambda(U1S) (SU1 mu U1 mu)-U-2 -U-& dagger;. In addition to leading to DM annihilation via SS -> U-1(sic)U-1, this coupling generates SSgg and SS gamma gamma couplings at one loop. Although naively divergent, these loop diagrams can be calculated under the assumption that the U1 is a gauge boson of a group broken at the TeV scale. With this DM -U1 coupling term, there are additional contributions to the various DM observables (relic density, direct and indirect detection). We find that the constraints on the SSDMM are relaxed for both heavy DM (M-S ? M-U1) and light DM (M-S < M-U1).