There are compelling physics motivations to consider the possibility of highly collimated groups of leptons: so-called “lepton jets”. In particular, the presence of a massive photon in the dark sector (see Stanford Rotation Projects in Heavy Photon Search) would explain some anomalies in the dark matter data and give rise to these event topologies. While the study of lepton jets has previously focused primarily on the topology of these events, the kinematics of these events may provide a powerful lever in identifying them, understanding key backgrounds and distinguishing among the models should a signal be observed.
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