Library Event Matching event classification algorithm for electron neutrino interactions in the NOvA detectors

Understand

We describe the Library Event Matching classification algorithm implemented for use in the NOvA $\nu_\mu \rightarrow \nu_e$ oscillation measurement.

• Library Event Matching, developed in a different form by the earlier MINOS experiment, is a powerful approach in which input trial events are compared to a large library of simulated events to find those that best match the input event.
• A key feature of the algorithm is that the comparisons are based on all the information available in the event, as opposed to higher-level derived quantities.
• The final event classifier is formed by examining the details of the best-matched library events.