A Dark Sector for $g_\mu-2$, $R_K$ and a diphoton resonance

G. Bélanger (1) , C. Delaunay (1)

1 LAPTH - Laboratoire d'Annecy-le-Vieux de Physique Théorique

We revisit a set of dark sector models, motivated by anomalies observed in $B$ decays and the muon anomalous magnetic moment, in the light of a recently reported diphoton excess around 750$\,$GeV. Interpreting the excess as a scalar resonance associated with the symmetry breaking sector of a dark gauge group, we show that a diphoton cross section of few fb can be accomodated, together with anomalies in $R_K$ and $g_\mu-2$ within a minimal dark sector model. The resulting prominent collider signatures are in the form of wide resonant signals into top and muon pair final states below $\sim1\,$TeV. The model further predicts a dark matter candidate, yet with a significantly underabundant relic density, unless produced by an appropriate non-thermal mechanism.

Domaines: Physique des Hautes Energies - Phénoménologie [hep-ph]

G. Bélanger, C. Delaunay. A Dark Sector for $g_\mu-2$, $R_K$ and a diphoton resonance. Physical Review D, 2016, 94, pp.075019. ⟨hal-01341907⟩