&--Saturday, September 29, 2007 ; 10:52 PM
EldwinSchrodinger @ Quarks and Leptons

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There are 2 more particles like the electron. All their properties are identicle to those of the electron, except that they are heavier, and each is associated with its own neutrino. Although we don't have any idea why is that so, the standard model theory still correctly describes the behavior of these particles. In experiments, various numbers of these particles are produced going in gifferent directions. They are unstable particles, Decaying in less than a millionth of a second into electrons, positrons, neutrinos, and photons, so they do not stay around after they are produced, nor do they end up in anything we see. In all cases, the standard model correctly predicts the number of them, their directions, energies, and lifetimes, and all other aspects of their behavior. One is called the muon, and the other would be the tau. because they behave in similar ways, the electron, the muon, tau, and their associated neutrinos are grouped together in a class of particles called leptons.

Labels: Elementary Particles

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