Northwestern University

Feb
5
Tue 2:00 PM

CANCELLED: CFP Colloquium: Eric Hessels: The proton size, the fine-structure constant and the electron electric dipole moment

When: Tuesday, February 5, 2019
2:00 PM - 3:15 PM  

Where: Technological Institute, F160, 2145 Sheridan Road, Evanston, IL 60208 map it

Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students

Contact: Laura Nevins   847.467.6678

Group: Center for Fundamental Physics Colloquia

Category: Lectures & Meetings

Description:

Abstract: Fundamental physics (including physics beyond the Standard Model) can be tested using table-top precision measurements. The talk will describe measurements of the size of the proton, the fine-structure constant and the electric dipole moment of the electron. Two recently completed measurements will be described. For the first measurement, the n=2 Lamb shift of atomic hydrogen is measured, allowing for a new determination of the charge radius of the proton. This determination is crucial to resolving the eight-year-old proton radius puzzle, in which it appeared that the proton radius took on a different value when measured with muons compared to measurements using electrons. The second measurement is of the n=2 triplet P fine structure of atomic helium, and this work is part of a program to obtain a new determination of the fine-structure constant. Both of these measurements use a new measurements technique: Frequency offset separated oscillatory fields. Finally, a new major effort (EDM^3) is starting at York University to measure the electron electric dipole moment using polar molecules embedded into inert-gas solids. This measurement will test for T violation and will probe physics up to the PeV energy scale.

Professor Eric Hessels, York University

Host: CFP

Keywords: Physics, Center for Fundamental Physics

 

***This talk will be rescheduled

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