New method of probing an oscillating EDM induced by axionlike dark matter using an rf Wien filter in storage rings

Abstract

Ahypothetical pseudoscalar particle axion, which is an immediate result of the Peccei-Quinn solution to the strong CP problem, may couple to gluons and lead to an oscillating electric dipole moment (EDM) of fundamental particles. This paper proposes a novel method of probing the axion-induced oscillating EDM in storage rings, using a radio frequency (rf) Wien filter. The Wien filter at the frequency of the sidebands of the axion and g - 2 frequency, f(axion) +/- f(g-2), generates a spin resonance in the presence of an oscillating EDM, as confirmed both by an analytical estimation of the spin equations and independently by simulation. A brief systematic study also shows that this method is unlikely to be limited by Wien filter misalignment issues.