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down quark |
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down quark [′dau̇n ‚kwärk] (particle physics) A quark with an electric charge of -⅓, baryon number of ⅓, and 0 strangeness and charm. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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Ordinary matter, such as protons and neutrons, contains only up quarks and down quarks, whereas the sigma-bs each contain a bottom quark and either a pair of up quarks or a pair of down quarks. The quarks that behaved as expected were down quarks, and the one that didn't was an up quark. A typical nucleon includes three quarks: two down quarks and one up quark for a neutron; two up quarks and one down quark for a proton. |
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