Faculty Host: Susan Gardner

"Proton Radius Puzzle: Experiments and Theory''

Apparently discrepant results on the value of the proton radius made the proton radius the most hotly discussed topic in physics during the last year and a half. The proton radius is measured in experiments on electron-proton scattering and in Lamb shift measurements in ordinary and muonic hydrogen. I will describe experimental and theoretical problems connected with determination of the proton radius, and discuss the perspectives of resolution of the proton radius puzzle.