New Limit on the Permanent Electric Dipole Moment of Xe129 Using He3 Comagnetometry and SQUID Detection

N. Sachdeva; I. Fan; E. Babcock; M. Burghoff; T. E. Chupp; S. Degenkolb; P. Fierlinger; S. Haude; E. Kraegeloh; W. Kilian; S. Knappe-Grüneberg; F. Kuchler; T. Liu; M. Marino; J. Meinel; K. Rolfs; Z. Salhi; A. Schnabel; J. T. Singh; S. Stuiber; W. A. Terrano; L. Trahms; J. Voigt

doi:10.1103/PhysRevLett.123.143003

New Limit on the Permanent Electric Dipole Moment of Xe129 Using He3 Comagnetometry and SQUID Detection

N. Sachdeva, I. Fan, E. Babcock, M. Burghoff, T. E. Chupp, S. Degenkolb, P. Fierlinger, S. Haude, E. Kraegeloh, W. Kilian, S. Knappe-Grüneberg, F. Kuchler, T. Liu, M. Marino, J. Meinel, K. Rolfs, Z. Salhi, A. Schnabel, J. T. Singh, S. Stuiber, W. A. Terrano, L. Trahms, J. Voigt

DOI 10.1103/PhysRevLett.123.143003 · Physical Review Letters

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Abstract

We report results of a new technique to measure the electric dipole moment of Xe129 with He3 comagnetometry. Both species are polarized using spin-exchange optical pumping, transferred to a measurement cell, and transported into a magnetically shielded room, where SQUID magnetometers detect free precession in applied electric and magnetic fields. The result from a one week measurement campaign in 2017 and a 2.5 week campaign in 2018, combined with detailed study of systematic effects, is dA(Xe129)=(1.4±6.6stat±2.0syst)×10−28 e cm. This corresponds to an upper limit of |dA(Xe129)|<1.4×10−27 e cm (95% C.L.), a factor of 5 more sensitive than the limit set in 2001.