There has been considerable debate among physicists over the last 15 years about conflicting measurements of the charge radius of a hydrogen atom’s proton—some confirming the predictions of our ...
Ars Technica: Proton’s mass radius is apparently shorter than its charge radius
Gell-Mann and Zweig’s “quark model” remains an elegant way to imagine the proton. It has two “up” quarks with electric charges of +2/3 each and one “down” quark with a charge of −1/3, for a total ...
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Phys.org on MSN: Cracking a 16-year proton mystery as ultra-precise hydrogen measurements confirm a smaller-than-expected core