A Dark Sector for $g_\mu-2$, $R_K$ and a Diphoton Resonance

TL;DR

This paper explores a dark sector model that simultaneously explains the muon g-2 anomaly, R_K anomalies, and a 750 GeV diphoton excess, predicting collider signatures and a dark matter candidate with specific relic density considerations.

Contribution

It introduces a minimal dark sector model linking multiple anomalies and a diphoton excess, providing a unified explanation and collider signatures.

Findings

Diphoton cross section of a few femtobarns can be achieved.

Model predicts wide resonant signals into top and muon pairs below 1 TeV.

Dark matter candidate with underabundant relic density unless non-thermal production.

Abstract

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.