CMS collisions from the CMS search for the dark photon in VBF Higgs production

This signature is examined in the vector boson fusion production mode, the Higgs boson is produced together with two antipodal, hadronic jets that are very close to the beampipe on opposite sides of the detector. Requiring the presence of two such "forward" jets greatly helps to reject background processes. When combined with the detection of a central, energetic photon and a sizable amount of missing transverse momentum in the same event, this signature is a powerful tool to look for semi-visible Higgs boson decays into a photon and a dark photon.