Speaker
Eric HESSELS
(York University, Toronto, Canada)
Description
The n=2 atomic hydrogen Lamb shift has been measured [1]. An update on this measurement (since it was first announced at the proton radius meeting in Mainz) will be given, including an explanation of the published uncertainty -- which is smaller than that announced in Mainz. Continuing measurements at York of helium fine-structure and of the electron electric dipole moment will also be discussed.
[1] N Bezginov, T Valdez, M Horbatsch, A Marsman, AC Vutha and EA Hessels, A measurement of the atomic hydrogen Lamb shift and the proton charge radius, Science 365, 1007 (2019).
