down quark


Also found in: Thesaurus, Encyclopedia, Wikipedia.
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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

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]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
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"
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
References in periodicals archive ?
The similarity in up and down quark masses renders the similarity in their chemical potentials.
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.
The top quark decays to a W boson and either a bottom quark (most frequently), a strange quark, or a down quark (rarely).
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].sup.+], u + d [right arrow] d + u (see Figure 2).
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. Other combinations of three spinons would reproduce the properties of electrons and their cousins.
The unmatter does exists, for example some messons and antimessons, through for a trifling of a second lifetime, so the pions are unmatter (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 ^ means anti), the kaon [K.sup.+] (us^), [K.sup.-] (u^s), Phi ([ss^), [D.sup.+] (cd^), [D.sup.0](cu^), [D.sup.+.sub.s] (cs^), J/Psi (cc^), [B.sup.-] (bu^), [B.sup.0] (db^), [B.sup.0.sub.s] (sb^), Upsilon (bb^), where c = charm quark, s = strange quark, b = bottom quark, etc.
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.