muon

[myoo-on]
noun Physics.
a lepton similar in most respects to the electron except that it is unstable, it may be positively charged, and its mass is approximately 207 times greater; the positively charged muon is the antiparticle of the negatively charged muon. Symbol: μ

Origin:
1950–55; by shortening of mu meson; see mu, -on1

muonic, adjective
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World English Dictionary
muon (ˈmjuːɒn)
 
n
a positive or negative elementary particle with a mass 207 times that of an electron and spin ½. It was originally called the mu meson but is now classified as a lepton
 
[C20: short for mu meson]
 
muonic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
muon   (my'ŏn')  Pronunciation Key 
An elementary particle in the lepton family having a mass 209 times that of the electron, a negative electric charge, and a mean lifetime of 2.2 × 10-6 seconds. The muon was originally called the mu-meson and was once thought to be a meson. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

muon

elementary subatomic particle similar to the electron but 207 times heavier. It has two forms, the negatively charged muon and its positively charged antiparticle. The muon was discovered as a constituent of cosmic-ray particle "showers" in 1936 by the American physicists Carl D. Anderson and Seth Neddermeyer. Because of its mass, it was at first thought to be the particle predicted by the Japanese physicist Yukawa Hideki in 1935 to explain the strong force that binds protons and neutrons together in atomic nuclei. It was subsequently discovered, however, that a muon is correctly assigned as a member of the lepton group of subatomic particles-i.e., it never reacts with nuclei or other particles through the strong interaction. A muon is relatively unstable, with a lifetime of only 2.2 microseconds before it decays by the weak force into an electron and two kinds of neutrinos. Because muons are charged, before decaying they lose energy by displacing electrons from atoms (ionization). At high-particle velocities close to the speed of light, ionization dissipates energy in relatively small amounts, so muons in cosmic radiation are extremely penetrating and can travel thousands of metres below the Earth's surface

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
They wrongly claim that from muon's perspective, the sea level approaches muon
  travelling the contracted length.
Pohl and his team have a come up with a smaller number by using a cousin of the
  electron, known as the muon.
So, the signature to look for when searching for top quarks is: one muon, one
  neutrino and four jets.
Neutrinos come in three varieties: muon, tau, and electron.
Image for muon
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