Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Any of the three least massive mesons, having a positive, neutral, or negative electric charge. The charged pions have a mass 273 times that of an electron and a mean lifetime of 2.6 × 10−8 second, and the neutral pion has a mass 264 times that of an electron and a mean lifetime of 8.4 × 10−17 second.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics Any of three
semistable mesons , having positive, negative or neutral charge, composed ofup anddown quarks /antiquarks .
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun a meson involved in holding the nucleus together; produced as the result of high-energy particle collision
Etymologies
from The American Heritage® Dictionary of the English Language, 4th Edition
from Wiktionary, Creative Commons Attribution/Share-Alike License
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Examples
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“The pion is usually pictured as a relatively simple system consisting of one quark and one anti-quark,” Dr. Huber says.
Researching the glue that holds the universe together Edward Willett 2006
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“The pion is usually pictured as a relatively simple system consisting of one quark and one anti-quark,” Dr. Huber says.
Archive 2006-12-10 Edward Willett 2006
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This is known as pion punch-through and gives a fake muon signal.
Detectors 101 JoAnne 2006
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This means that a diagram with several interactions will give a larger contribution than the naive one with the exchange of only one pion, which is the one though that does gives a rough picture of the scattering of two protons.
Forces 2001
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If one of the jet's particles strikes the nucleus of a gas atom, the collision can briefly create a particle called a pion, which then rapidly decays into a pair of gamma rays.
PhysOrg.com - latest science and technology news stories 2010
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Another type of elementary particle produced by the collision, called a pion, can decay into muons, but on average the pions wouldn't undergo this decay until they were, on average, meters from the collision.
Science News / Features, Blog Entries, Column Entries, Issues, News Items and Book Reviews 2008
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My work on its specific application to particle physics as a mechanism for generation of the nucleon mass and the pion was first published in 1960.
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Je suis un citoyen gabonais et j'exige des élections dans le strict respect de la constitution de La République!!!! et je dis non à ceux qui appelle la france à se mêler de la politique gabonaise notamment BEN MOUMBAMBA qu'on ne connait pas et qui pourrait être un pion de cette france!
Global Voices in English » Gabon: On President Omar Bongo’s death 2009
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"Please welcome your tied reigning D.C. cham-pion," announces Crane, who has emceed U.S.
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Informed by contemporary Japanese design, current offerings include a golden-hued, honeycomb-faced joint, a dual-banded piece whose face is visible through a peephole in a brushed metal shield, and another with brass pieces jutting from its face resembling a steampunk satellite view of a hurricane -- rock it like one, and you'll totally Score-pion.
Thrillist: Dedegumo: Japanese Watches Made Right Before Your Eyes Thrillist 2010
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