Shedding light on dark matter with recent muon (g-2) and Higgs exotic decay measurements

Recently, we have witnessed two hints of physics beyond the standard model: a 3.3 sigma local excess (M-A0 = 52 GeV) in the search for H-0 -> A(0)A(0) -> b (b) over bar mu(+)mu(-) and a 4.2 sigma deviation from the SM prediction in the (g - 2)(mu) , measurement. The first excess was found by the ATLAS collaboration using 139 fb(-1) data at root s = 13 TeV. The second deviation is a combination of the results from the Brookhaven E821 and the recently reported Fermilab E989 experiment. We attempt to explain these deviations in terms of a renormalizable simplified dark matter model. Inspired by the null signal result from dark matter (DM) direct detection, we interpret the possible new particle, A(0); as a pseudoscalar mediator connecting DM and the standard model. On the other hand, a new vector-like muon lepton can explain these two excesses at the same time while contributing to the DM phenomenology.

Automated summary

Two hints of physics beyond the standard model have been witnessed recently, including a local excess and a deviation from the SM prediction. These deviations could potentially be explained through a new dark matter model.