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Atomic and molecular

Atomic and molecular

Solving the proton puzzle

19 Jun 2021
Taken from the June 2021 issue of Physics World.

Why were so many physicists so wrong about the size of the proton for so long? As Edwin Cartlidge explains, the solution to this “proton radius puzzle” has as much to do with bureaucracy and politics as it does with physics

illustration of jigsaw puzzle
(Courtesy: iStock/Greyfebruary)
Randolf Pohl was not in a good mood, late one evening in July 2009. Sitting in a control room at the

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Edwin Cartlidge is a science writer in Rome, Italy, edwin.cartlidge@yahoo.com
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