An Improved Limit on the Muon Electric Dipole Moment
G.W.Bennett, B.Bousquet, H.N.Brown, G.Bunce, R.M.Carey, P.Cushman,, G.T.Danby, P.T.Debevec, M.Deile, H.Deng, W.Deninger, S.K.Dhawan,, V.P.Druzhinin, L.Duong, E.Efstathiadis, F.J.M.Farley, G.V.Fedotovich,, S.Giron, F.E.Gray, D.Grigoriev, M.Grosse-Perdekamp, A.Grossmann, M.F.Hare,
TL;DR
This paper reports three independent experiments measuring the muon electric dipole moment using the Brookhaven g-2 storage ring, resulting in a new, more stringent upper limit that improves previous constraints by a factor of five.
Contribution
The study provides the most precise limit to date on the muon EDM, utilizing multiple analyses to enhance the sensitivity of the measurement.
Findings
Muon EDM limit set at |d| < 1.9E-19 e-cm (95% C.L.)
Results are consistent with zero EDM, indicating no detectable CP violation in muons
Improved the previous muon EDM limit by a factor of five.
Abstract
Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from the muon g-2 storage ring at Brookhaven National Laboratory. Details on the experimental apparatus and the three analyses are presented. Since the individual results on the positive and negative muon, as well as the combined result, d=-0.1(0.9)E-19 e-cm, are all consistent with zero, we set a new muon EDM limit, |d| < 1.9E-19 e-cm (95% C.L.). This represents a factor of 5 improvement over the previous best limit on the muon EDM.
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