A New Lifetime Measurement of the H<sup>3</sup>Δ<sub>1</sub> state of Thorium Monoxide for the ACME electron EDM experiment

ORAL

Abstract

The electron electric dipole moment (EDM) is a powerful probe for new physics beyond the Standard Model. The ACME experiment measures the electron EDM by performing spin precession in the H$^3\Delta_1$ state of thorium monoxide. In 2018, the ACME II experiment set the most stringent upper limit on the electron EDM: $|d_e|<1.1\times10^{-29}\ \textup{e}\cdot \textup{cm}$ (\textit{Nature}, \textbf{562}(2018) 355-360). The next generation of the experiment is currently under development. We have recently performed a measurement of the lifetime of the H-state in a molecular beam, finding it to be $\sim$4.5 times longer than the precession time in the ACME II experiment. This allows us to increase the precession time in ACME III, significantly improving its statistical sensitivity to the electron EDM. Together with other improvements under development, this provides a path towards an order of magnitude statistical improvement in probing the electron EDM.

*Supported by the National Science Foundation, Gordon and Betty Moore Foundation and Sloan Foundation.

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Presenters

  • Daniel G Ang

    • Harvard University

Authors

  • Daniel G Ang

    • Harvard University

  • David P DeMille

    • Yale University
    • The University of Chicago
    • University of Chicago

  • John M Doyle

    • Harvard University

  • Zhen Han

    • University of Chicago

  • Bingjie Hao

    • Northwestern University

  • Ayami Hiramoto

    • Okayama University

  • Peiran Hu

    • University of Chicago

  • Nicholas Hutzler

    • California Institute of Technology
    • Caltech
    • Division of Physics, Mathematics, and Astronomy, California Institute of Technology

  • Daniel D Lascar

    • Northwestern University

  • Zack Lasner

    • Harvard University

  • Siyuan Liu

    • Northwestern University

  • Takahiko Masuda

    • Okayama Univ
    • Okayama University

  • Cole Meisenhelder

    • Harvard University

  • John Mitchell

    • Northwestern University

  • Cristian D Panda

    • University of California, Berkeley
    • UC Berkeley

  • Noboru Sasao

    • Okayama University

  • Satoshi Uetake

    • Okayama University

  • Xing Wu

    • University of Chicago
    • Yale University
    • University of Chicago, Harvard University

  • Koji Yoshimura

    • Okayama University

  • Gerald Gabrielse

    • Northwestern University