quark

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Related to Quarks: String theory, Leptons, Hadrons

quark

(qwark),
A fundamental particle believed to be the primary constituent of all mesons and baryons; quarks have a charge that is a fraction of 1 electron charge and interact through electromagnetic and nuclear forces. Six varieties are thought to exist with the unusual names of up, down, strange, charmed, bottom, and top.
[a word of indeterminate sense used by James Joyce in his novel Finnegans Wake]

quark

(kwōrk)
A fundamental particle believed to be the primary constituent of all mesons and baryons; quarks have a charge that is a fraction of one electron charge and interact through electromagnetic and nuclear forces. Six varieties are thought to exist, with the unusual names of up, down, strange, charmed, bottom, and top.
[a word of indeterminate sense used by James Joyce in his novel Finnegans Wake]
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References in periodicals archive ?
These long-awaited neutron-spin data indicate that, under some conditions, the previously overlooked orbital motions of valence quarks make a major contribution to nucleon spin, comments theorist Gerald A.
For one thing, it could end what had been a puzzling absence of evidence for particles with groupings containing more than three quarks or antiquarks, which theorists for decades have been expecting to show up in accelerators.
For instance, there could be yet-undiscovered heavy particles that interact differently with quarks than with antiquarks, she says.
To fathom how five quark components can coexist within one particle, theorists expect to reconsider their models of the interactions among quarks and gluons, the particles that bind quarks together.
Jets are produced when two highly energetic quarks bounce off each other.
Whatever the explanation, scientists are taking a second look at the theory of quantum chromodynamics, or QCD, which describes the possible interactions of quarks.
If things go well, in the next several years, the up and down quarks may finally weigh in, van Kolck says.
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 particles' masses, decay products and other data indicated a composition of a charm quark, its antimatter counterpart, two up quarks and a down quark.
Electrically charged leptons are formed when the color charges of quarks and antiquarks with different flavors are annihilated, while neutrinos are formed when both the electric and color charges of quarks and antiquarks with the same flavor are annihilated.
As the nucleon is a composite system of strong interacting quarks, the amplitude M of the process in Eq.
Murray Gell-Mann (see 1953), who had originated the quark concept, labored to work out the rules governing the combination of quarks.