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Measurement of the Electron Magnetic Moment
X. Fan, T. G. Myers, B. A. D. Sukra +1
The electron magnetic moment,, is determined 2.2 times more accurately than the value that stood for 1…
Electrostatic focusing of cold and heavy molecules for the ACME electron EDM search
Xing Wu, Peiran Hu, Zhen Han +5
The current best upper limit for electron electric dipole moment (EDM), ecm (% confidence), was set by the ACME collaboration in 2018. The ACM…
Driven One-Particle Quantum Cyclotron
Xing Fan, Gerald Gabrielse
A quantum cyclotron is one trapped electron or positron that occupies only its lowest cyclotron and spin states. A master equation is solved for a driven quantum cyclotron with a Q…
Circumventing Detector Backaction on a Quantum Cyclotron
Xing Fan, Gerald Gabrielse
Detector backaction can be completely evaded when the state of a one-electron quantum cyclotron is detected, but it nonetheless significantly broadens the quantum-jump resonance li…
The metastable Q state of ThO: A new resource for the ACME electron EDM search
Xing Wu, Zhen Han, James Chow +7
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…
Attaining the shot-noise-limit in the ACME measurement of the electron electric dipole moment
C. D. Panda, C. Meisenhelder, M. Verma +7
Experimental searches for the electron electric dipole moment, , probe new physics beyond the Standard Model. Recently, the ACME Collaboration set a new limit of $|d_e| <1.1\t…
Methods, Analysis, and the Treatment of Systematic Errors for the Electron Electric Dipole Moment Search in Thorium Monoxide
ACME Collaboration, Jacob Baron, Wes C. Campbell +15
We recently set a new limit on the electric dipole moment of the electron (eEDM) (J. Baron et al., ACME collaboration, Science 343 (2014), 269-272), which represented an order-of-m…
STIRAP preparation of a coherent superposition of ThO states for an improved electron EDM measurement
C. D. Panda, B. R. O'Leary, A. D. West +9
Experimental searches for the electron electric dipole moment (EDM) probe new physics beyond the Standard Model. The current best EDM limit was set by the ACME Collaboration [Scien…
Zeeman interaction in ThO for the electron EDM search
A. N. Petrov, L. V. Skripnikov, A. V. Titov +7
The current limit on the electron's electric dipole moment, (90% confidence), was set using the molecule thorium monoxide (T…
Order of Magnitude Smaller Limit on the Electric Dipole Moment of the Electron
ACME Collaboration, Jacob Baron, Wesley C. Campbell +15
The Standard Model (SM) of particle physics fails to explain dark matter and why matter survived annihilation with antimatter following the Big Bang. Extensions to the SM, such as…
Advanced Cold Molecule Electron EDM
ACME Collaboration, Wesley C. Campbell, Cheong Chan +11
Measurement of a non-zero electric dipole moment (EDM) of the electron within a few orders of magnitude of the current best limit of |d_e| < 1.05 e -27 e cm would be an indication…
Shot-noise-limited spin measurements in a pulsed molecular beam
E. Kirilov, W. C. Campbell, J. M. Doyle +9
Heavy diatomic molecules have been identified as good candidates for use in electron electric dipole moment (eEDM) searches. Suitable molecular species can be produced in pulsed be…
Resolving an Individual One-Proton Spin Flip to Determine a Proton Spin State
J. DiSciacca, M. Marshall, K. Marable +1
Previous measurements with a single trapped proton or antiproton detected spin resonance from the increased scatter of frequency measurements caused by many spin flips. Here a meas…
One-Particle Measurement of the Antiproton Magnetic Moment
ATRAP Collaboration, J. DiSciacca, M. Marshall +13
\DeclareRobustCommand{\pbar}{\HepAntiParticle{p}{}{}\xspace} \DeclareRobustCommand{\p}{\HepParticle{p}{}{}\xspace} \DeclareRobustCommand{\mup}{{}{}\xspace} \DeclareRobustCom…
Direct Measurement of the Proton Magnetic Moment
J. DiSciacca, G. Gabrielse
The proton magnetic moment in nuclear magnetons is measured to be , a 2.5 ppm (parts per million) uncertainty. The direct determinat…
Trapped Antihydrogen in Its Ground State
G. Gabrielse, R. Kalra, W. S. Kolthammer +13
Antihydrogen atoms are confined in an Ioffe trap for 15 to 1000 seconds -- long enough to ensure that they reach their ground state. Though reproducibility challenges remain in mak…
Magnetic and electric dipole moments of the state in ThO
Amar C. Vutha, Benjamin Spaun, Yulia V. Gurevich +5
The metastable state in the thorium monoxide (ThO) molecule is highly sensitive to the presence of a CP-violating permanent electric dipole moment of the electron (eE…
A cryogenic beam of refractory, chemically reactive molecules with expansion cooling
Nicholas R. Hutzler, Maxwell Parsons, Yulia V. Gurevich +7
Cryogenically cooled buffer gas beam sources of the molecule thorium monoxide (ThO) are optimized and characterized. Both helium and neon buffer gas sources are shown to produce Th…
Cavity Control of a Single-Electron Quantum Cyclotron:\\Measuring the Electron Magnetic Moment
D. Hanneke, S. Fogwell Hoogerheide, G. Gabrielse
Measurements with a one-electron quantum cyclotron determine the electron magnetic moment, given by , and the fine struct…
Optimized Planar Penning Traps for Quantum Information Studies
J. Goldman, G. Gabrielse
A one-electron qubit would offer a new option for quantum information science, including the possibility of extremely long coherence times. One-quantum cyclotron transitions and sp…
Self-Excitation and Feedback Cooling of an Isolated Proton
N. Guise, J. DiSciacca, G. Gabrielse
The first one-proton self-excited oscillator (SEO) and one-proton feedback cooling are demonstrated. In a Penning trap with a large magnetic gradient, the SEO frequency is resolved…
Search for the electric dipole moment of the electron with thorium monoxide
Amar C. Vutha, Wesley C. Campbell, Yulia V. Gurevich +8
The electric dipole moment of the electron (eEDM) is a signature of CP-violating physics beyond the Standard Model. We describe an ongoing experiment to measure or set improved lim…
New Measurement of the Electron Magnetic Moment and the Fine Structure Constant
D. Hanneke, S. Fogwell, G. Gabrielse
A measurement using a one-electron quantum cyclotron gives the electron magnetic moment in Bohr magnetons, g/2 = 1.001 159 652 180 73 (28) [0.28 ppt], with an uncertainty 2.7 and 1…