Stimulated Raman adiabatic passage preparation of a coherent superposition of ThO<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msup><mml:mi>H</mml:mi><mml:mn>3</mml:mn></mml:msup><mml:msub><mml:mi mathvariant="normal">Δ</mml:mi><mml:mn>1</mml:mn></mml:msub></mml:mrow></mml:math>states for an improved electron electric-dipole-moment measurement

Panda, Cristian; O'Leary, Brendon; West, Adam; Baron, Jacob; Hess, Paul; Hoffman, Colleen G.; Kirilov, Emil; Overstreet, Chris; West, Elizabeth; DeMille, David; Doyle, John M.; Gabrielse, Gerald

doi:10.1103/physreva.93.052110

Cited by 33 publications

(30 citation statements)

References 38 publications

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“…In addition, the efficiency with which we collect the light is improved by using light pipes instead of fibre bundles. Together we anticipate a factor of »6 improvement in signal [137].…”

Section: Discussionmentioning

confidence: 75%

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Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

et al. 2017

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We recently set a new limit on the electric dipole moment of the electron (eEDM) (J Baron et al and ACME collaboration 2014 Science 343 269-272), which represented an order-of-magnitude improvement on the previous limit and placed more stringent constraints on many charge-parityviolating extensions to the standard model. In this paper we discuss the measurement in detail. The experimental method and associated apparatus are described, together with the techniques used to isolate the eEDM signal. In particular, we detail the way experimental switches were used to suppress effects that can mimic the signal of interest. The methods used to search for systematic errors, and models explaining observed systematic errors, are also described. We briefly discuss possible improvements to the experiment. 9 Note that the limit we report here uses an updated value for  = 78 eff GV cm −1 which is obtained by averaging the results from [29, 30]. 10 A detailed discussion of the sign convention for this Hamiltonian term is provided in section appendix A.3 1 states have very small magnetic moments [58] since the d 3 2 orbital valence electron serves to nearly cancel the magnetic moment of the s 1 2 orbital. The actual magnetic moment of H deviates from zero primarily because of mixing with other states [59]. We express ThO molecule states using the basis Wñ |Y J M , , , , where Y is the electronic state, J is the total angular momentum, M is the projection of J onto the laboratoryẑ-axis, and Ω 1 (V cm −1 ) −1 [67]; this permits full (>99%) polarisation of the state in small applied electric fields,   10 V cm −1 , allowing us to take full advantage of the huge  eff in ThO. The Ω-doublet structure is also useful in rejecting systematic errors since it allows for spectroscopic reversal of  µ -n eff by addressing different  states without reversing the applied electric field [68]. This is discussed in greater detail in section 5.4.The H state in ThO is metastable with a lifetime »1.8 ms [69], limiting our measurement time to t » 1 ms. We note that this is comparable to previous beam-based eEDM measurements where the atomic/molecular states used had significantly longer lifetimes [20,69,70]. 1 (V cm −1 ) −1 (black arrow/lines) is the expectation value of the molecular electric dipole moment in these states [60]. Additionally, a magnetic field   causes a Zeeman shift  m »-Mg z 1 B , with m p » -ǵ 2 6kHz 1 B G −1 (red arrow/lines) [59, 64]. A nonzero eEDM would result in an additional energy shift   »-M d e eff (blue arrow/lines) where  = -1 (+1) when the applied  field is (is not) reversed. The orientation of   eff (green arrows), the spin of the electron in the σ orbital (black arrow next to molecule), the external electric field  , and the external magnetic field   are shown relative to the laboratoryẑ direction which is oriented upwards on the page. Diagram not to scale. 11 Throughout the paper, we give numerical values of energies (with  = 1) in terms of angular frequencies by using the notation p´f 2 , where f ...

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“…In addition, the efficiency with which we collect the light is improved by using light pipes instead of fibre bundles. Together we anticipate a factor of »6 improvement in signal [137].…”

Section: Discussionmentioning

confidence: 75%

“…, , prep . We can significantly increase the number of molecules prepared by using stimulated Raman adiabatic passage (STIRAP) to perform coherent population transfer from X to H via C. We have demonstrated an estimated efficiency of 75% which will increase the usable molecule number by a factor of »12 [137].…”

Section: Discussionmentioning

confidence: 99%

Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

et al. 2017

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“…The large transition moments in both  X C(see appendix B) and  Q C makes it possible to efficiently transfer population between the X and Q state by STIRAP via the intermediate C state (figure 5(a)). A similar STIRAP scheme to prepare population in the H state of ThO was previously demonstrated [30], and was used in the latest ACME measurement of the electron EDM [1]. Using --X C QSTIRAP for state preparation before a molecular lens requires efficient excitation across a very large range of transverse positions and velocities (i.e.…”

Section: Population Transfer Between X and Q Via --X C Qstirapmentioning

confidence: 99%

The metastable Q ³Δ₂ state of ThO: a new resource for the ACME electron EDM search

Han

Chow

et al. 2020

New J. Phys.

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“…Charginos and neutralinos induce an electric dipole moment of the electron at two loops from Barr-Zee type diagrams [74], which has been extensively discussed [75][76][77][78]. The current strongest constrain on the electron EDM comes from the ACME I experiment [79], which will be substantially improved in the near future with results from ACME II and ACME III [80,81]. A recent analysis of current and near-future electron EDM constraints on charginos appears in [82].…”

Section: μ| [Tev]mentioning

confidence: 99%

Last electroweak WIMP standing: pseudo-dirac higgsino status and compact stars as future probes

Krall

Reece

2018

Chinese Phys. C

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Electroweak WIMPs are under intense scrutiny from direct detection, indirect detection, and collider experiments. Nonetheless the pure (pseudo-Dirac) higgsino, one of the simplest such WIMPs, remains elusive. We present an up-to-date assessment of current experimental constraints on neutralino dark matter. The strongest bound on pure higgsino dark matter currently may arise from AMS-02 measurements of antiprotons, though the interpretation of these results has sizable uncertainty. We discuss whether future astrophysical observations could offer novel ways to test higgsino dark matter, especially in the challenging regime with order MeV mass splitting between the two neutral higgsinos. We find that heating of white dwarfs by annihilation of higgsinos captured via inelastic scattering could be one useful probe, although it will require challenging observations of distant dwarf galaxies or a convincing case to be made for substantial dark matter content in ω Cen, a globular cluster that may be a remnant of a disrupted dwarf galaxy. White dwarfs and neutron stars give a target for astronomical observations that could eventually help to close the last, most difficult corner of parameter space for dark matter with weak interactions.

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Stimulated Raman adiabatic passage preparation of a coherent superposition of ThOH3Δ1states for an improved electron electric-dipole-moment measurement

Cited by 33 publications

References 38 publications

Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

The metastable Q ³Δ₂ state of ThO: a new resource for the ACME electron EDM search

Last electroweak WIMP standing: pseudo-dirac higgsino status and compact stars as future probes

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Stimulated Raman adiabatic passage preparation of a coherent superposition of ThOH3Δ1states for an improved electron electric-dipole-moment measurement

Cited by 33 publications

References 38 publications

Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

Methods, analysis, and the treatment of systematic errors for the electron electric dipole moment search in thorium monoxide

The metastable Q 3Δ2 state of ThO: a new resource for the ACME electron EDM search

Last electroweak WIMP standing: pseudo-dirac higgsino status and compact stars as future probes

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The metastable Q ³Δ₂ state of ThO: a new resource for the ACME electron EDM search