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New proton measurements may throw physics a curve

Ars Technica: "We may have been overestimating the proton for the last 60 years, if a new experiment has anything to say about it. A group of researchers have tried a new method of measuring the proton's radius that involved getting a muon to orbit it instead of an electron. The new approach is ten times more accurate than the way it has been done since the invention of quantum mechanics, and it has produced a value for the proton's radius that is four percent smaller than the currently accepted one. Either the new measurement is correct and the proton is actually smaller, or quantum electrodynamics theory needs an adjustment."

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arstechnica.com
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