Institut des
NanoSciences de Paris
Accueil > Evénements > Séminaires > Archives 2017 > The Proton radius puzzle

Séminaire général de l’INSP

The Proton radius puzzle - Aldo Antognini - Jeudi 30 mars 2017 à 16h30

INSP - UPMC - 4 place Jussieu - 75005 Paris - Barre 22-23, 4e étage, salle 317

ldo Antognini - lnstitut ETH de Zurich


We have measured several 2S-2P transitions in muonic hydrogen (μp), muonic deuterium (μd) and muonic helium ions (μ3He, μ4He). 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 7σ 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 μd. The status of the proton charge radius puzzle including the new insights obtained by μd spectroscopy will be discussed.