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pion
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pion

In physics, a subatomic particle with a neutral form (mass 135 MeV) and a charged form (mass 139 MeV). The charged pion decays into muons and neutrinos and the neutral form decays into gamma-ray photons. They belong to the hadron class of elementary particles, and consist of pairs of quarks.

The mass of a charged pion is 273 times that of an electron; the mass of a neutral pion is 264 times that of an electron.
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Mentioned in?  References in periodicals archive?   Hutchinson browser?   Full browser?
 
00 Hardcover QC793 Jame Cronin and Val Fitch discovered that the long-lived neutral kaon decays both into three and into two pions in 1964, confirming the violation of the postulated CP (charge conjugation-parity) symmetry of the laws of physics, and eventually earning a Nobel Prize in the process.
CP violation; from quarks to leptons; proceedings by SciTech Book News
When pions crash into protons at an energy of about 18 gigaelectron-volts (GeV), the gluons holding the quarks together behave as if they were elastic strings stretched between the quarks.
Exotic needle found in particle haystack by Peterson, Ivars / Science News
in this picture, pions carry the force holding these particles together.
The stuff of protons: gluing quarks to make protons, neutrons, and ... by Peterson, Ivars / Science News
 
 
 
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