The metastable Q <sup>3</sup>Δ<sub>2</sub> state of ThO: a new resource for the ACME electron EDM search

Wu, Xing; Han, Zhuo Rachel; Chow, J. R.; Ang, Daniel; Meisenhelder, Cole; Panda, Cristian; West, Elizabeth; Gabrielse, Gerald; Doyle, John M.; DeMille, D.

doi:10.1088/1367-2630/ab6a3a

Cited by 34 publications

(26 citation statements)

References 37 publications

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“…Based on the mix of all these cutting-edge technologies, IR precision laser spectroscopy of buffer-gas-cooled samples is expected to give life, in the near future, to unprecedented-accuracy molecular tests of fundamental physics at the electron volt energy scale [ 127 ]. These include the search for hypothetical long-range fifth forces between hadrons [ 128 ] or time-reversal violation (electron’s electric dipole moment) [ 129 , 130 , 131 , 132 ], detection of parity violation in chiral molecules [ 104 ], testing the time stability of the proton-to-electron mass ratio [ 133 , 134 ], as well as precision tests of Quantum Electro-Dynamics [ 135 , 136 ].…”

Section: Discussionmentioning

confidence: 99%

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Amato

Sarno

Aiello

et al. 2020

IJMS

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We review the recent developments in precision ro-vibrational spectroscopy of buffer-gas-cooled neutral molecules, obtained using infrared frequency combs either as direct probe sources or as ultra-accurate optical rulers. In particular, we show how coherent broadband spectroscopy of complex molecules especially benefits from drastic simplification of the spectra brought about by cooling of internal temperatures. Moreover, cooling the translational motion allows longer light-molecule interaction times and hence reduced transit-time broadening effects, crucial for high-precision spectroscopy on simple molecules. In this respect, we report on the progress of absolute frequency metrology experiments with buffer-gas-cooled molecules, focusing on the advanced technologies that led to record measurements with acetylene. Finally, we briefly discuss the prospects for further improving the ultimate accuracy of the spectroscopic frequency measurement.

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Section: Discussionmentioning

confidence: 99%

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Amato

Sarno

Aiello

et al. 2020

IJMS

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“…6. Sensitivities both from ACME-II [61] and projected next generation EDM limits [66], assuming µ = 1.2 TeV, M2 = 0.3M1, and φ = π/2. M2 is restricted to be > 3 TeV to keep a relatively higgsino-like LSP.…”

Section: Electron Edmmentioning

confidence: 99%

Race to find split Higgsino dark matter

Sheff

Wells

2022

Phys. Rev. D

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Split higgsinos are a compelling class of models to explain dark matter and may be on the verge of detection by multiple current experimental avenues. The idea is based on a large split in scales between the electroweak scale and decoupled scalars, with relatively light higgsinos between the two. Such models enjoy the merit of depending on very few parameters while still explaining gauge coupling unification, dark matter, and most of the hierarchy between the Planck and electroweak scales, and they remain undetected by past experiments. We analyze split higgsinos in view of current and next generation experiments. We discuss the direct and indirect detection prospects and further demonstrate promising discovery potentials in the upcoming electron electric dipole moment experiments. The parameter space of this model is analyzed in terms of experiments expected to run in the coming years and where we should be looking for the next potential discoveries.

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“…Assuming the detection area of radius ∼1 cm to be ∼1 m away, typical values for comparable beam experiments [14,16], and using a slow beam divergence of 1 sr, we expect a total of ∼ 10 5−6 molecules. One can also increase the number of molecules by magnetic or electrostatic guiding [64,65]. There are also possibilities that the molecular production can be chemically enhanced [66].…”

Section: Termmentioning

confidence: 99%

Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches

Mitra

Prasannaa²,

Sahoo

et al. 2021

Atoms

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In search of suitable molecular candidates for probing the electric dipole moment (EDM) of the electron (de), a property that arises due to parity and time-reversal violating (P,T-odd) interactions, we consider the triatomic mercury hydroxide (HgOH) molecule. The impetus for this proposal is based on previous works on two systems: the recently proposed ytterbium hydroxide (YbOH) experiment that demonstrates the advantages of polyatomics for such EDM searches, and the finding that mercury halides provide the highest enhancement due to de compared to other diatomic molecules. We identify the ground state of HgOH as being in a bent geometry, and show that its intrinsic EDM sensitivity is comparable to the corresponding value for YbOH. Along with the theoretical results, we discuss plausible experimental schemes for an EDM measurement in HgOH. Furthermore, we provide pilot calculations of the EDM sensitivity for de for HgCH3 and HgCF3, that are natural extensions of HgOH.

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

Abstract: The best upper limit for the electron electric dipole moment was recently set by the ACME collaboration. This experiment measures an electron spin-precession in a cold beam of ThO molecules in their metastable D H 3

Cited by 34 publications

References 37 publications

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Race to find split Higgsino dark matter

Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches

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

Abstract: The best upper limit for the electron electric dipole moment was recently set by the ACME collaboration. This experiment measures an electron spin-precession in a cold beam of ThO molecules in their metastable D H 3

Cited by 34 publications

References 37 publications

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Infrared Comb Spectroscopy of Buffer-Gas-Cooled Molecules: Toward Absolute Frequency Metrology of Cold Acetylene

Race to find split Higgsino dark matter

Study of HgOH to Assess Its Suitability for Electron Electric Dipole Moment Searches

Contact Info

Product

Resources

About

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