Negative muon count for the Fermilab Muon Campus accelerator

Abstract

The Fermilab Muon g-2 experiment aims to measure the muon anomalous magnetic dipole moment to a precision of 0.14 ppm. Recent results with positive muons confirm a discrepancy between its experimental and theoretical value. However, running the experiment with negative muons is equally as important as it will provide an additional data point for the value of the muon anomaly. This work will examine the feasibility of achieving such a measurement by estimating the rates of negative muons arriving at the experiment as well as discuss important accelerator-based modifications needed in order to achieve this goal. We found that the rate of negative muons arriving at the experiment is roughly 60% that of positives. Although highly polarized, the delivered negative muons are mostly free from unwanted backgrounds contrary to their countersign muons.