A new search for the permanent electric dipole moment of $^{129}$Xe at FRM-II
ORAL
Abstract
CP-violating sources in beyond-the-standard-model physics, necessary to explain baryon asymmetry, give rise to permanent electric dipole moments (EDMs). Precise EDM measurements of the neutron, electron, paramagnetic and diamagnetic atoms constrain CP-violating parameters. The previous limit for the $^{129}$Xe EDM is $6 \times 10^{-27}~e \cdot \mathrm{cm}$ (95$\%$ CL). The HeXeEDM experiment at FRM-II (Munich Research Reactor) utilizes an ultralow magnetic field in a high-performance magnetically shielded room and $^3$He comagnetometer to improve the limit by up to three orders of magnitude. In the experiment, hyperpolarized $^3$He and $^{129}$Xe precession signals are detected with a SQUID magnetometer array in the presence of applied electric and magnetic fields. Recent progress will be presented.
*This work is supported US Department of Energy Grant No. DE FG02 04 ER41331.
