Cosmic Background Rejection in SBND with Multiple Detector Systems - The CRUMBS Tool

The Short Baseline Near Detector (SBND) will be one of the three Liquid Argon Time Projection Chambers making up the Short Baseline Neutrino program on Fermilab's Booster Neutrino Beam. Critical to any surface neutrino detector is the removal of cosmic ray induced backgrounds. In every 190 beam spills SBND expects to see a cosmic ray coincident with the beam time, compared to one neutrino interaction in every 20 spills. Each trigger will also see ~5 cosmic muons during the detector readout time making cosmic rays the dominant initial background for all analyses. Removing both of these sources of cosmic background will be critical to SBND making the high precision measurements necessary to achieve its core physics goals. As well as the TPC, SBND will have two auxiliary detector systems; a photon detection system and a cosmic ray tagging system. CRUMBS, Cosmic Rejection Using Multi-system BDT Score, is a new cosmic removal tool using a multi-variate analysis to exploit the complementary information provided by all three detector subsystems to improve cosmic background rejection whilst preserving neutrino efficiency.