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This Week at Physics

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Event Number 4851

  Friday, October 12th, 2018

Physics Department Colloquium
A tabletop-scale probe for TeV physics: the electric dipole moment of the electron
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: David DeMille, Yale
Abstract: Time-reversal (T) symmetry is observed to be broken in K- and B-meson systems, in a manner consistent with the Standard Model (SM) of electroweak interactions. Violation of T-invariance makes it possible for elementary particles such as the electron to have an electric dipole moment (EDM) along their spin axis. Although the SM prediction for the electron EDM is too small to detect, extensions to the SM frequently predict EDMs within a few orders of magnitude of the current limits. I will describe our ACME experiment, which uses methods of atomic and molecular physics to detect the electron’s EDM. We recently completed the most sensitive search for this quantity, finding a result consistent with zero but setting a limit an order of magnitude smaller than previous work. Remarkably, the result of this tabletop-scale experiment sets strong constraints on the existence of T-violating phenomena well above the TeV scale being probed at the Large Hadron Collider, and has a substantial impact on theories of physics beyond the Standard Model.
Host: Mark Saffman
Video: https://vod.physics.wisc.edu/media/2018_10_12.m4v
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