An Event Display for the Light Dark Matter eXperiment (LDMX)

The Light Dark Matter eXperiment (LDMX) is a proposed experiment to detect dark matter in the sub-GeV mass range, using both a missing momentum search for dark matter production and a search for long-lived visibly decaying dark photons, the equivalent of the photon, but to dark matter. The experiment works by firing a beam of high energy electrons through taggers, recoil trackers, a trigger scintillator, and a magnet into an electromagnetic calorimeter and a hadronic calorimeter. Currently, the data from the experiment was mostly observed in the form of histograms and not visualizations. The goal of this project was to create an interactive display of event data showing each sub-detector and the reconstructed hits in a given event. For this purpose, we used the PHOENIX framework, an open-source modeling software designed for high energy physics experiments. We show examples of event displays from simulated data and include suggestions for future improvements.