Heidelberg 2015 – wissenschaftliches Programm

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SYDM: Symposium Dipole Moments - A Tool to Search for New Physics

SYDM 3: Session 3

SYDM 3.3: Vortrag

Dienstag, 24. März 2015, 17:30–17:45, P/H1

Search for a permanent Xe-EDM - Experimental status — •Stefan Zimmer¹, Werner Heil¹, Sergei Karpuk¹, Kathlynne Tullney¹, Yuri Sobolev¹, Fabian Allmendinger², Ulrich Schmidt², Olivier Grasdijk³, Klaus Jungmann³, Lorenz Willmann³, Hans-Joachim Krause⁴, and Andreas Offenhäuser⁴ — ¹Institut für Physik, Universität Mainz — ²Physikalisches Institut, Universität Heidelberg — ³University of Groningen — ⁴Forschungszentrum Jülich

A permanent EDM of the isotope 129Xe would imply a breakdown of both parity P and time-reversal symmetry T and, through the CPT theorem, a breakdown in CP. Our goal is to improve the present experimental limit (dXe<3*10-27 ecm) by about four orders of magnitude (most precise EDM limit measured in the diamagnetic atom 199Hg (dHg<3.1*10-29 ecm)). The non-observation of particle and atom EDMs has ruled out more speculative models (beyond Standard Model) than any other single experimental approach in particle physics. We propose a 3He/129Xe clock comparison experiment with the detection of free spin precession of the nuclear polarized gas samples with a SQUID. The precession of co-located 3He/129Xe nuclear spins can be used as ultra-sensitive probe for non-magnetic spin interactions of type Δν~dXe*E, since the magnetic dipole interaction (Zeeman-term) drops out in the frequency difference Δν of the Larmor frequencies. The detection of free spin precession with spin coherence times T > 1 day doesn't have the systematic limitations of a feedback loop necessary to sustain coherent spin precession.