Hexapole state selector for focusing and polarizing muonium

Muonium, a hydrogen-like atom composed of a positive muon and an electron, is pivotal for precision tests of the Standard Model and searches for new physics through exotic atom spectroscopy. Aiming to achieve a breakthrough in precision measurements involving muons and muonium, the development of a high-brightness muonium beam is under study. Such a beam would facilitate atom interferometry using muonium, leading to a high-precision measurement of the muon mass. For this purpose, the potential of a hexapole magnet as a focusing device to improve the muonium beam’s brightness was considered. Monte Carlo simulations of muonium trajectories within a magnetic field indicate promising prospects for enhancing the beam’s brightness.