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Measuring the electric dipole moment of the electron in BaF

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  • Published: 20 November 2018
  • Volume 72, article number 197, (2018)
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Measuring the electric dipole moment of the electron in BaF
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  • The NL-eEDM collaboration,
  • Parul Aggarwal1,2,
  • Hendrick L. Bethlem3,
  • Anastasia Borschevsky1,2,
  • Malika Denis1,2,
  • Kevin Esajas1,2,
  • Pi A. B. Haase1,2,
  • Yongliang Hao1,2,
  • Steven Hoekstra1,2,
  • Klaus Jungmann1,2,
  • Thomas B. Meijknecht1,2,
  • Maarten C. Mooij2,3,
  • Rob G. E. Timmermans1,2,
  • Wim Ubachs3,
  • Lorenz Willmann1,2 &
  • …
  • Artem Zapara1,2 

  • 2089 Accesses

  • 97 Citations

  • 4 Altmetric

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Abstract

We investigate the merits of a measurement of the permanent electric dipole moment of the electron (eEDM) with barium monofluoride molecules, thereby searching for phenomena of CP violation beyond those incorporated in the standard model (SM) of particle physics. Although the BaF molecule has a smaller enhancement factor in terms of the effective electric field than other molecules used in current studies (YbF, ThO and ThF+), we show that a competitive measurement is possible by combining Stark-deceleration, laser-cooling and an intense primary cold source of BaF molecules. With the long coherent interaction times obtainable in a cold beam of BaF, a sensitivity of 5 × 10−30 e⋅cm for an eEDM is feasible. We describe the rationale, the challenges and the experimental methods envisioned to achieve this target.

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Authors and Affiliations

  1. Van Swinderen Institute for Particle Physics and Gravity (VSI), University of Groningen, Groningen, The Netherlands

    Parul Aggarwal, Anastasia Borschevsky, Malika Denis, Kevin Esajas, Pi A. B. Haase, Yongliang Hao, Steven Hoekstra, Klaus Jungmann, Thomas B. Meijknecht, Rob G. E. Timmermans, Lorenz Willmann & Artem Zapara

  2. Nikhef, National Institute for Subatomic Physics, Science Park 105, 1098 XG, Amsterdam, The Netherlands

    Parul Aggarwal, Anastasia Borschevsky, Malika Denis, Kevin Esajas, Pi A. B. Haase, Yongliang Hao, Steven Hoekstra, Klaus Jungmann, Thomas B. Meijknecht, Maarten C. Mooij, Rob G. E. Timmermans, Lorenz Willmann & Artem Zapara

  3. LaserLaB, Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV, Amsterdam, The Netherlands

    Hendrick L. Bethlem, Maarten C. Mooij & Wim Ubachs

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  1. Parul Aggarwal
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Correspondence to Steven Hoekstra.

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The NL-eEDM collaboration., Aggarwal, P., Bethlem, H.L. et al. Measuring the electric dipole moment of the electron in BaF. Eur. Phys. J. D 72, 197 (2018). https://doi.org/10.1140/epjd/e2018-90192-9

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  • Received: 25 April 2018

  • Revised: 28 August 2018

  • Published: 20 November 2018

  • DOI: https://doi.org/10.1140/epjd/e2018-90192-9

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