down quark


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Related to down quark: up quark, Quark theory

down quark

n. Abbr. d
The flavor of quark that has a charge of - 1/3 and a mass about 10 times that of an electron, belongs to the first generation of elementary fermions, and is a component of nucleons and other hadrons.

down′ quark`


n.
the quark having electric charge −? times the electron's charge and together with the up quark being a constituent of nucleons.
[1975–80]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.down quark - a stable quark with an electric charge of -1/3 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 ?
The particles' masses, decay products and other data indicated a composition of a charm quark, its antimatter counterpart, two up quarks and a down quark.
ATOMS, PROTONS AND PASTIES TO make matter you only need three things - electrons, an up quark and a down quark.
A baryon is a mixture of three quarks such as that a proton is composed of two up quarks and one down quark and that a neutron is composed of one up quark and two down quarks.
This is an interaction between the color charge of one up quark in proton and the color charge of one down quark in neutron via exchanging a [[pi].
Three spinons, for example--two of one kind, one of another- could make particles with electric charge of +2/3, like the up quark, or -1/3, like the down quark.
Which have the composition u^d and ud^, where by u^ we mean anti-up quark, d = down quark, and analogously u = up quark and d^ = anti-down quark, while by ^ we mean "anti".
Physicists had long conjectured that a down quark could combine with a strange and a bottom quark to form the three-generation cascade baryon.
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.
The combined results may thus yield enough information for theorists to pinpoint the up and down quark masses, van Kolck says.
One type is made of two charm quarks and an up quark; the other is made of two charm quarks and a down quark.
The pion, for example, consists of a down quark and an up antiquark.