Speaker
Description
In 2010, precise determination of the proton radius from muonic lamb shift data, a result that systematically disagreed with previous atomic lamb shift and electron scattering data, sparked what was to become known as the proton radius puzzle. Since then, there have many new measurements and new theory calculations done to understand the source of the discrepancy. A preponderance of the new evidences points to the muonic lamb shift data being correct and now both CODATA and the Particle Data Group recommend using a value of ~0.84 fm for the proton's charge radius. I will review the new experimental results, the re-analyses, and new theoretical work that resulted in this paradigm shift as well as discuss planned future measurements as we go from puzzle to precision.