Colloquium speaker, David DeMille (Yale University), today at 3:45pm

[Patterson, Robin L.]

Please join us for the Physics Colloquium today, at 3:45 PM in The Robert Smith Seminar Room. There will be a reception at 3:30PM in the Atrium. Details concerning the talk are as follows:

Speaker:         David DeMille (Yale University)
Date:               Tuesday, March 5, 2019
Time:              3:45PM
Place:             1080 Physics Research Building, The Robert Smith Seminar Room
Title:                A Tabletop-scale Probe for TeV-scale Physics: The Electric Dipole Moment of the Electron

Abstract:  Violation of time-reversal (T) symmetry is observed in K- and B-meson systems, and these measurements are explained within the Standard Model (SM) of electroweak interactions.  However, additional sources of T violation are needed to explain the cosmological asymmetry between matter and antimatter.  In the presence of T-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, extensions to the SM frequently predict EDMs 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 for the EDM is consistent with zero, but sets a limit ten times smaller than any previous work.  Remarkably, the result of this tabletop-scale experiment sets strong constraints on theories of physics beyond the Standard Model.  In many specific models, the ACME probes physics associated with new particles whose mass is well above the few-TeV scale explored directly at the Large Hadron Collider.
The website for the colloquium is https://physics.osu.edu/physics-colloquium-schedule


Also, there is the speaker/student discussion starting just after the colloquium, at 4:45pm in the Smith Seminar Room.



Robin
[The Ohio State University]
Robin Patterson
Program Coordinator
Department of Physics
1040K Physics Research Building, 191 W. Woodruff Avenue, Columbus, OH 43210
(614) 292-8523 Office     (614) 292-7557 Fax
patterson.716 at osu.edu<mailto:patterson.716 at osu.edu> osu.edu<http://osu.edu/>

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