Word: meson
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Dates: during 1961-1961
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...will ever see the little particle, but theoretical physicists-those mystic prophets of science-calculated several years ago that an unknown heavy meson probably can exist. Like the neutron, they figured, it would have no electric charge, so it would leave no track in a cloud or bubble chamber. They were sure it would disintegrate so quickly that other signs of its brief career would be hard to find. But the theoreticians considered the undiscovered particle so important that they named it omega in advance, implying that it might be the last unknown particle left in nature's locker...