The B anomalies, the U 1 leptoquark and dark matter

Abstract

Abstract The present-day B-anomalies involving b → sμ + μ − or b → cτ − ν ¯ $$ \overline{\nu} $$ transitions can all be explained with the addition of a vector U 1 leptoquark with a mass of M U 1 $$ {M}_{U_1} $$ ≳ 1.8 TeV. In the scalar singlet dark matter model (SSDMM), the DM is a scalar S that couples to the Higgs via λ 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 λ U 1 S S 2 U 1 μ † U 1 μ $$ {\lambda}_{U_1S}{S}^2{U}_{1\mu}^{\dagger }{U}_1^{\mu } $$ . In addition to leading to DM annihilation via SS → U 1 U ¯ 1 $$ {U}_1{\overline{U}}_1 $$ , this coupling generates SSgg and SSγγ couplings at one loop. Although naively divergent, these loop diagrams can be calculated under the assumption that the U 1 is a gauge boson of a group broken at the TeV scale. With this DM-U 1 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 U 1 $$ {M}_{U_1} $$ ) and light DM (M S < M U 1 $$ {M}_{U_1} $$ ).

Keywords

• Particle Nature of Dark Matter
• Semi-Leptonic Decays
• Specific BSM Phenomenology