The kaon is such an evanescent and unstable particle on Earth,
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Because of this, scattering processes and decay of unstable particles are important in cosmology.
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This benefit can be the difference between a stable vs . an unstable particle beam for high current accelerators.
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It can take into account, if necessary, all QCD and EW diagrams, masses of fermions and bosons and widths of unstable particles.
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His early work on cosmic rays focused on nuclear interactions produced by cosmic ray particles and on the new, unstable particles that result.
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And when the film's reality starts crumbling and reforming itself, it's as if the story wasn't recorded on celluloid or video, but with charged, unstable particles.
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The mass of an unstable particle is formally a complex number, with the real part being its mass in the usual sense, and the imaginary part being its decay rate in natural units.
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The above relations also allow expressing the mean lifetime " ? " of an unstable particle ( in seconds ) in terms of its decay width " ? " ( in eV ) via.
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If a non-reproducing human population decayed the same way unstable particles do, a human population of initial size N would, in a period 3 times the median human life span, reduce to N / 8.
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Personally, Siegfried said, he's betting on WIMPs _ that's short for weakly interacting massive particles _ thought to be heavy, generally unstable particles that hover in the outer regions of galaxies and rarely interact with ordinary matter.