Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session C05: Exploring the Standard Model with Precision Atomic PhysicsInvited
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Sponsoring Units: DAMOP GPMFC Chair: Marianna Safronova, University of Delaware Room: Sheraton Governor's Square 14 |
Saturday, April 13, 2019 1:30PM - 2:06PM |
C05.00001: A tabletop-scale probe for TeV-scale physics: new limit on the electron electric dipole moment from the ACME experiment Invited Speaker: David DeMille All CP-violating effects observed to date are consistent with a single origin in the Standard Model (SM)--the complex phase in the CKM matrix that describes quark flavor-changing currents. However, additional sources of CP violation, associated with new physics above the electroweak scale, are needed to explain the observed cosmological baryon asymmetry. In the presence of CP-violation, elementary particles such as the electron can have an electric dipole moment (EDM) along their spin axis. The SM prediction for the electron EDM is nonzero, but too small to detect. By contrast, many plausible extensions to the SM naturally should lead to EDMs that are within experimental reach. Our ACME experiment uses methods of atomic and molecular physics to detect the electron EDM, and we recently completed the most sensitive search for this quantity. Our result is consistent with zero, but sets a limit ten times smaller than in any previous work. Remarkably, the result of this tabletop-scale experiment sets strong constraints on theories of physics beyond the SM. In many specific models, the ACME result probes physics associated with new particles whose mass is well above the scales studied directly at colliders. This talk will describe the new ACME result and some of its implications. |
Saturday, April 13, 2019 2:06PM - 2:42PM |
C05.00002: Parity Violation in Yb Invited Speaker: Dmitry Budker In this talk we will review the recent results and future prospects of experiments measuring atomic parity-violation effects in various isotopes of ytterbium. The next phase of experiments will look for nuclear spin dependent parity violation probing weak interactions within the nucleus. A connection with dark-matter searches will also be made. |
Saturday, April 13, 2019 2:42PM - 3:18PM |
C05.00003: Measurement of the fine structure constant as test of the standard model Invited Speaker: Holger Mueller <div editor-summary"="" id="abstract-1"> A precise determination of the fine-structure constant α allows for a test of the Standard Model of particle physics. We used matter-wave interferometry with cesium atoms to make the most accurate measurement of α to date, α = 1/137.035999046(27). Determining the value of α to an accuracy of 0.20 parts per billion provides an independent method for testing the accuracy of quantum electrodynamics and the Standard Model. It may also enable searches of the so-called “dark sector” for explanations of dark matter. Using the recoil frequency of cesium-133 atoms in a matter-wave interferometer with multiphoton interactions (Bragg diffraction and Bloch oscillations), we demonstrate the largest phase (12 million radians) of any Ramsey-Bordé interferometer and control systematic effects at a level of 0.12 part per billion. Comparison with Penning trap measurements of the electron gyromagnetic anomaly ge − 2 via the Standard Model of particle physics is now limited by the uncertainty in ge − 2. |
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