Bulletin of the American Physical Society
APS April Meeting 2021
Volume 66, Number 5
Saturday–Tuesday, April 17–20, 2021; Virtual; Time Zone: Central Daylight Time, USA
Session D04: Tests of Discrete Symmetry Violations in Atoms and MoleculesInvited Live
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Sponsoring Units: GPMFC Chair: David Hanneke, Amherst College |
Saturday, April 17, 2021 1:30PM - 2:06PM Live |
D04.00001: Searches for P- and T-violating permanent electric dipole moments Invited Speaker: Jaideep Singh A permanent electric dipole moment (EDM) of a particle or system is a measure of the separation of charge along its angular momentum axis and is a direct signal of both parity ($P$) violation & time-reversal ($T$) violation and, assuming $CPT$-symmetry, charge-parity ($CP$) violation. For nearly 70 years EDMs have been studied, first as a signal of a $P$-violation and then as a signal of $CP$-violation. Contemporary motivations include the role that $CP$-violation plays in explaining the cosmological matter-antimatter asymmetry and the search for new physics. Experiments on a variety of systems have become ever-more sensitive, but provide only upper limits on EDMs, and theory at several scales is crucial to interpret these limits. In this talk, I will provide an overview of EDM experiments in atom and molecules in both the paramagnetic and diamagnetic sectors. [Preview Abstract] |
Saturday, April 17, 2021 2:06PM - 2:42PM Live |
D04.00002: The Cold Molecule Nuclear Time-Reversal Experiment (CeNTREX) Invited Speaker: Tanya Zelevinsky Observations of time-reversal symmetry (T) violation outside the Standard Model could shed light on the most pressing questions in physics such as the origins of the asymmetry between matter and antimatter in the universe. Experiments searching for such mechanisms can also set stringent constraints on theories that include sources of T violation. The Cold Molecule Nuclear Time-Reversal Experiment (CeNTREX) collaboration uses modern techniques of molecular quantum state control to search for a T-violating nuclear Schiff moment (NSM). A beam of cold TlF molecules traverses an interaction region where a nonzero NSM would drive the Tl nuclear spin precession about an applied electric field. This precession can be detected as an asymmetry between the spin state populations. CeNTREX maximizes the intrinsic sensitivity to new physics by relying on heavy Tl nuclei as constituents in polar molecules. The statistical sensitivity is enhanced by using a bright cryogenic-buffer-gas cooled molecular beam source along with electrostatic focusing, achieving a long spin precession time, and utilizing optical cycling in molecules for a near-unity detection efficiency. The control of TlF quantum states is essential to the experimental scheme, including rotational cooling of the molecules that is carried out with ultraviolet laser light and microwaves and concentrates the molecular population in a single quantum state. [Preview Abstract] |
Saturday, April 17, 2021 2:42PM - 3:18PM Live |
D04.00003: Do electrons violate symmetry? A search for the electron's P- and T-violating permanent electric dipole moment Invited Speaker: Tanya Roussy We are probing TeV-scale physics with a unique tabletop experiment which combines precision measurement, a fairly unusual ion trap, and over a dozen lasers to both measure the electron's electric dipole moment and constrain potential dark matter candidates. In this talk I will introduce the essence of our measurement as well as our methods for constraining Beyond Standard Model physics [1]. [1] The JILA eEDM Experiment, In preparation$, $Tanya S. Roussy, Luke Caldwell, Trevor Wright, Kia Boon Ng, Noah Schlossberger, Sun Yool, Anzhou Wang, Gustavo Santanella, Antonio Vigil, Jun Ye and Eric Cornell [Preview Abstract] |
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