up quark


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Related to up quark: down quark

up quark

n. Abbr. u
The flavor of quark that has a charge of + 2/3 and a mass estimated at three to six times that of an electron, belongs to the first generation of elementary fermions, and is a component of nucleons and other hadrons.

up′ quark`


n.
the quark having electric charge ? times the electron's charge and together with the down quark being a constituent of nucleons.
[1975–80]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.up quark - a stable quark with an electric charge of +2/3 and a mass 607 times that of an electron
quark - (physics) hypothetical truly fundamental particle in mesons and baryons; there are supposed to be six flavors of quarks (and their antiquarks), which come in pairs; each has an electric charge of +2/3 or -1/3; "quarks have not been observed directly but theoretical predictions based on their existence have been confirmed experimentally"
References in periodicals archive ?
Called Xi-cc++, the newly detected particle contains two charm quarks - one of the three known heavy flavors - and one up quark - a light flavor.
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.
A neutron, which also has a spin of 1/2, consists of two down quarks and one up quark.