Proton Radius Determination

Animation showing what happens to the charge form factor of the proton when different radii are used for both the data and the state-of-the-art model. In the figure $G_E$ is the charge form factor of the proton and $Q^2$ is the four momentum transferred to the system (i.e. how hard the proton was struct).

The details of the physics can be found in the open access published manuscript by J. M. Alarcón, D. W. Higinbotham, C. Weiss, and Zhihong Ye, Phys. Rev. C 99, 044303 https://doi.org/10.1103/PhysRevC.99.044303

D. Higinbotham made the animation for the Jefferson Lab press release and it used by phys.org in their aritcle: https://phys.org/news/2019-06-physicists-team-tackle-proton-radius.html

The animtion gif in the code is referred to as "Goldilocks" since by just watching the animation anyone can easily see which proton radius is just right.