Special Universe Talk: Spin tracking for Geometric phase correction for EDM searches with ultracold neutrons

by Albert Steyerl (Univ. of Rhode Island)

Friday 18 Oct 2013, 13:00 → 14:00 Europe/Berlin

seminar room, downstairs (Excellence Cluster Universe, Boltzmannstrasse 2, 85748 Garching)

Pendlebury et al. [Phys. Rev. A 70, 032102 (2004)] were the first to investigate the possibility that the search for an electric dipole moment of elementary particles based on Ramsey-separated oscillatory field magnetic resonance with trapped ultracold neutrons may be affected by a false EDM signal related to geometric phases. Their work was based on the Bloch equation and later work using the Redfield method corroborated their results. Employing a third method, direct solution of the spin-dependent Schroedinger equation, we obtain more general analytic expressions for a specific geometry. They reduce to the previous results where comparison is possible, showing that all three methods are equivalent. As a new application we analyze the effect of path curvature due to the Coriolis acceleration.