Thursday, December 15, 2022, 16:00
WBGB/019
Marc Vanderhaeghen, Mainz University
Abstract:
Nucleons (protons and neutrons) are the building blocks of atomic
nuclei, and are responsible for more than 99 % of the visible matter in
the universe. Despite decades of efforts in studying its internal
structure, there are still a number of puzzles surrounding the proton
such as its spin and charge radius. Accurate knowledge about the proton
charge radius is not only essential for understanding how QCD works in
the non-perturbative region, but also important for bound state QED
calculations of atomic energy levels.
In this colloquium, I will review the latest situation concerning the
proton charge radius in light of the new experimental results from both
atomic hydrogen spectroscopy and electron scattering measurements. I
will also present the related theoretical developments and backgrounds
concerning the determination of the proton charge radius using different
experimental techniques, and provide an outlook to upcoming experiments.