Thursday, March 25, 2021, 16:00
online only
(for the zoom link contact michael.spira@psi.ch, emanuele.bagnaschi@psi.ch or
pulak.banerjee@psi.ch)
Saïda Guellati-Khélifa, LKB/Sorbonne Université
Abstract:
The fine-structure constant "alpha" is this "magic and enigmatic" number
close to 1/137 that appears in the various fields of physics. This
dimensionless constant characterizes the strength of the electromagnetic
interaction between light and charged elementary particles, such as
electron or muon. Knowing accurately its numerical value is crucial to
test, even with low energy experiments, the calculations of quantum
electrodynamics and some theoretical predictions of the Standard Model.
In this talk, I will present our experiment which recently led to a
new determination of the structure-fine constant with a relative
uncertainty of 8.1 x 10-11 and I will discuss the impact of
this result on the tests of the Standard Model.