Measuring the Precession Frequency in the E989 Muon g-2 Experiment*

The E989 Muon g-2 Experiment has completed its first physics run and collected a dataset roughly two times larger than the Brookhaven experiment's. With a target precision of 140 ppb, divided equally between statistics and systematics and requiring 20 times as many muons as Brookhaven, E989 will achieve the most precise measurement to date of the muon's anomalous magnetic moment. The E989 experiment seeks to either confirm or resolve the larger than 3 sigma discrepancy between theory and measurement. The measurement requires extracting the muon anomalous precession frequency in a highly uniform magnetic field. This frequency is imprinted on the time-dependent energy distribution of decay positrons observed by 24 electromagnetic calorimeters.  Systematic effects originating both from storage ring beam dynamics and detector effects complicate the precession analysis. This presentation will describe the analysis techniques as they are applied to data from the 2018 run and show blinded analysis results that demonstrate the quality of the data collected.