weak nuclear force
"weak nuclear force." World Encyclopedia. . Encyclopedia.com. (June 21, 2018). http://www.encyclopedia.com/environment/encyclopedias-almanacs-transcripts-and-maps/weak-nuclear-force
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W and Z particles
W and Z particles,elementary particles that mediate, or carry, the fundamental force associated with weak interactions. The discovery of the W and Z particles at CERN near Geneva, Switzerland, in the early 1980s was an important confirmation of electroweak theory, which unifies the electromagnetic and weak forces. The W and Z particles are quite massive for elementary particles; they are roughly 100 times as massive as the proton.
"W and Z particles." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (June 21, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/w-and-z-particles
"W and Z particles." The Columbia Encyclopedia, 6th ed.. . Retrieved June 21, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/w-and-z-particles