Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 28: Fundamentale Symmetrien

HK 28.6: Talk

Tuesday, March 5, 2013, 15:45–16:00, HSZ-103

Experimental search for the electric dipole moment (EDM) of ¹²⁹Xe in ³He/¹²⁹Xe clock-comparison experiments — •Anja Scharth¹, Werner Heil¹, Sergei Karpuk¹, Yury Sobolev¹, Kathlynne Tullney¹, Fabian Allmendinger², Ulrich Schmidt², Martin Burghoff³, Wolfgang Kilian³, Allard Schnabel³, Frank Seifert³, Lutz Trahms³, Olivier Grasdijk⁴, Klaus Jungmann⁴, and Lorenz Willman⁴ — ¹Institut für Physik, Universität Mainz — ²Physikalisches Institut, Universität Heidelberg — ³PTB Berlin — ⁴University of Groningen

Permanent atomic EDMs would imply a breakdown of both parity and time reversal symmetry and therefore lead to a violation of CP symmetry. Thus searches for the EDM of ¹²⁹Xe are an unambiguous method to test physics beyond the standard model. Our approach is to use co-located ³He/¹²⁹Xe spin samples and to measure their coherent spin-precession over extended periods of ∼ 1 day, typically. Based on our experience with measurements on Lorentz-invariance [1,2], we intend to reach a measurement sensitivity that will improve the present upper limit d_Xe = 3 · 10⁻²⁷ e · cm significantly. Phase I of this experiment will be performed in the magnetically shielded room BMSR-2 of the PTB Berlin using very sensitive SQUID gradiometers as magnetic flux detectors and electric fields of ≈2 kV/cm. The experimental setup and current status of work will be presented.

[1] C.Gemmel et al., Eur. Phys. J D 47, 303 (2010)

[2] C.Gemmel et al., Phys. Rev D 82, 111901(R) (2010)