Orateur
Dr
Aldo Antognini
(Paul Scherrer Insitute)
Description
We have measured several 2S-2P transitions in muonic hydrogen
($\mu$p), muonic deuterium ($\mu$d) and muonic helium ions ($\mu^3$He,
$\mu^4$He). From muonic hydrogen we extracted a proton charge radius
20 times more precise than obtained from electron-proton scattering
and hydrogen high-precision laser spectroscopy but at a variance of
$7\sigma$ from these values. This discrepancy is nowadays referred to
as the ``proton radius puzzle''.
New insight has been recently provided by the first determination of
the deuteron charge radius from laser spectroscopy of $\mu$d.
The status of the proton charge radius puzzle including the new
insights obtained from $\mu$d spectroscopy will be discussed.
Author
Dr
Aldo Antognini
(Paul Scherrer Insitute)
