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Lofty Thought of the Day
- Category: Science & Technology
(graphic: Chris Gash) NYTimes.Com By DENNIS OVERBYE Not so for the proton, the subatomic particle that anchors atoms and is the building block of all ordinary matter, of stars, planets and people. Physicists announced last week that a new experiment had shown that the proton is about 4 percent smaller than they thought.
Instead of celebration, however, the result has caused consternation. Such a big discrepancy, say the physicists, led by Randolf Pohl of the Max Planck Institute for Quantum Optics in Garching, Germany, could mean that the most accurate theory in the history of physics, quantum electrodynamics, which describes how light and matter interact, is in trouble.
“What you have is a result that actually shocked us,” said Paul Rabinowitz, a chemist from Princeton University, who was a member of Dr. Pohl’s team.
The results were published in Nature. Protons, of course, have not shrunk. They have been whatever size they are ever since they congealed out of a primordial soup of energy and even smaller particles — quarks and gluons — in the early moments of the Big Bang. Determining how big they are, however, is both important to fundamental physics and extremely difficult...MORE...
