Aula Careri (Dip. di Fisica - Edificio G. Marconi)
Aula Careri
Dip. di Fisica - Edificio G. Marconi
Description
The proton is not an elementary particle, it has a substructure
governed by quarks and gluons. The spatial extensions of the electric
charge and magnetization determine the size of the proton and its
response to electromagnetic interaction.
Recently, contradicting observations have challenged our understanding
of the proton. The disagreement between proton radius determinations
from high-precision muonic hydrogen spectroscopy and numerous atomic
hydrogen and electron scattering measurements has become known as the
proton radius puzzle, which has received much attention even in public
media. The puzzle has a variety of possible resolutions, including
physics beyond the Standard Model, missing conventional physics, and
errors or underestimated uncertainties in the extraction of the radius
from the data. I will discuss ways that will eventually help to resolve
the puzzle. The MUon Scattering Experiment (MUSE) in preparation at
PSI will have a key role toward a resolution of the puzzle.
