The puzzle of a proton’s proportions

Nature, Published online: 06 November 2019; doi:10.1038/s41586-019-1721-2A magnetic-spectrometer-free method for electron–proton scattering data reveals a proton charge radius 2.7 standard deviations smaller than the currently accepted value from electron–proton scattering, yet consistent with other recent experiments.

The puzzle of a proton’s proportions

Two new experiments only add to the confusion.

Mon 11 Nov 19 from Cosmos Magazine

New measurement yields smaller proton radius

Using the first new method in half a century for measuring the size of the proton via electron scattering, the PRad collaboration has produced a new value for the proton's radius in an experiment ...

Wed 6 Nov 19 from Phys.org

New measurement yields smaller proton radius, Wed 6 Nov 19 from ScienceDaily

New Measurement Yields Smaller Proton Radius, Wed 6 Nov 19 from Newswise

10-Year Proton Measurement Mystery Is Probably Solved

A precise new measurement of the size of the proton shows a decade-long problem may now have a solution.Read more...

Wed 6 Nov 19 from Gizmodo

MSU physics faculty's breakthrough research resolves years-old proton size puzzle

This research, titled the "Proton Radius Experiment" and performed by a national scientific team including three MSU physicists, publishes today in Nature, the international journal of science.

Wed 6 Nov 19 from Newswise

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