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Saturday, April 15, 2006
Neutrinos Have Mass
The Standard Model of particle physics specifies that neutrinos should have no mass. These particles are so small that they can pass directly through the Earth without interacting with any matter. But once in a while they can be expected to interact with a detector.

In a recent experiment at Fermilab, as reported by the BBC, muon neutrinos were generated, and fired at detectors both in Fermilab itself, and, by shooting them through the Earth, at a detector in a mine 450 miles away. Fewer than expected were picked up by the distant detector, leading to the conclusion that some of them had been transformed - changed flavor - and this is an event that is only possible if they have mass.

Perhaps this is where the missing matter of the universe is to be found!?

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