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| exceedingly short-lived meson | ||||
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| an elementary particle responsible for the forces in the atomic nucleus; a hadron with a baryon number of 0 | ||||
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| [in physics] of or pertaining to a meson | ||||
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| an elementary particle with a negative charge and a half-life of 2 microsecond; decays to electron and neutrino and antineutrino |