Likelihood-Based Reconstruction Techniques in ANNIE

ANNIE is a 26-ton gadolinium-doped water Cherenkov detector on the Booster Neutrino Beam at Fermilab. The primary physics goal of ANNIE is to make precision measurements of the number of final state neutrons from neutrino interactions in water to improve the systematic uncertainties of next-generation long-baseline neutrino experiments. In addition, ANNIE is also doing detector R&D on new Large Area Picosecond PhotoDetectors (LAPPDs) and Water-based Liquid Scintillator (WbLS) detector medium. To achieve ANNIE's ambitious physics goals, while fully accommodating its unique R&D campaign, a new likelihood-based reconstruction method is being developed. This reconstruction method will also allow for detailed studies of the current ANNIE detector, along with future detector configurations. In addition, the methodology used to develop this reconstruction method can be generically applied to other optical experiments for reconstruction and detector studies. The talk will first give a general overview of ANNIE and then focus on the reconstruction techniques.