Author(s): F. Heiße, F. Köhler-Langes, S. Rau, J. Hou, S. Junck, A. Kracke, A. Mooser, W. Quint, S. Ulmer, G. Werth, K. Blaum, and S. Sturm
The most precise measurement to date of the proton mass finds a value that is 3 standard deviations lower than previous estimates.
[Phys. Rev. Lett. 119, 033001] Published Tue Jul 18, 2017