Progress Toward the First Search for Bound Neutron Oscillation into Antineutron in a Liquid Argon TPC

UNSPECIFIED (2020) Progress Toward the First Search for Bound Neutron Oscillation into Antineutron in a Liquid Argon TPC. Other. UNSPECIFIED.

Abstract

This note presents current progress for a neutron-antineutron oscillation (n− n̄) search in MicroBooNE paving the way for the first search analysis of such process in a Liquid Argon Time Projection Chamber (LArTPC). Convolutional Neural Network (CNN) and Boosted Decision Tree (BDT) algorithms were used to select signal n − n̄ events over cosmogenic backgrounds. The CNN-only, BDT-only, and the combined (CNN+BDT) methods were demonstrated on the Monte-Carlo signal and background events. Validation of the CNNonly and the BDT-only methods was carried out on a small dataset of MicroBooNE Run1 off-beam data, setting the starting point toward further improvement of the analysis.