We have successfully generated a test sample of Dark Higgs MC according to the prescription given by Matt Reece.  The decay chain is WH->e nu chi0 chi0, where chi0 is the SUSY LSP.  The chi0’s then decay through the dark sector as chi0->chiD N(aD) where chiD is the dark photon, aD is the dark pseduscalar Higgs, and N can range from 2 to 4.  The dark Higgseses then decay to two electrons or two muons.

The model parameters used in this generation are as follows:

M(H)=120 GeV

M(chi0)=10 GeV

M(chiD)=1 GeV

M(aD)=300 MeV

Br(chi0->chiD aD aD)=0.333

Br(chi0->chiD aD aD aD)=0.333

Br(chi0->chiD aD aD aD aD)=0.333

Br(aD->ee)=0.525

Br(aD->mu mu)=0.466

Br(aD->pi pi)=0.009

There are other SUSY model parameters that are not listed above.

The plots below compare the shape of the electron and muon multiplicity distributions for the Dark Higgs with respect to Standard Model W+heavy jet production.  These plots are normalized to unit area.

Clearly, the lepton multiplicity in this Dark Higgs model is much higher than in SM W+heavy jets.