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Encyclopedia > Antiquark

The antiquark is the antiparticle of the quark. For each kind of particle, there is an associated antiparticle with the same mass but opposite electromagnetic, weak, and strong charges, as well as spin. ... For other uses of this term, see: Quark (disambiguation) 1974 discovery photograph of a possible charmed baryon, now identified as the Σc++ In particle physics, the quarks are subatomic particles thought to be elemental and indivisible. ...

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ooBdoo (2085 words)
The composite particles made of quarks and antiquarks are the hadrons.
The masses of the heavy charm and bottom quarks are obtained from the masses of hadrons containing a single heavy quark (and one light antiquark or two light quarks) and from the analysis of quarkonia.
The existence of a third generation of quarks was predicted by Kobayashi and Maskawa who realized that the observed violation of CP symmetry by neutral kaons could not be accommodated into the Standard Model with two generations of quarks.
Quark - Printer-friendly - MSN Encarta (1524 words)
Antiquarks have many of the same properties as their corresponding quarks, but some of their properties are opposite to that of their counterparts.
Pions may consist of an up quark and a down antiquark (with an electric charge of 1), a down quark and an up antiquark (with a charge of –1), or an up quark and an up antiquark (with a charge of 0).
The color charges of the quarks in a baryon are all different and add up to 0, or white, making the baryon “colorless.” The color charges of the quark and antiquark in a meson are complementary and also add up to 0 (white), making the meson colorless.
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