particle physics
Researchers propose updating a 1773 experiment by Henry Cavendish to detect millicharged particles, a potential dark matter candidate. The design uses nested metal shells and could be 10,000 times more sensitive than past methods. The setup promises to be cheaper and faster than particle accelerators.
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Two precise experiments have agreed on a proton radius of about 0.84 femtometres, aligning with a surprising 2010 measurement and resolving a long-standing puzzle in particle physics. Researchers used lasers to study electron transitions in hydrogen atoms. The findings, published in Nature and Physical Review Letters, boost confidence in the smaller proton size.