top quark


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top quark

[′täp ‚kwärk]
(particle physics)
A hypothetical quark that is postulated to have a mass of approximately 30-50 GeV, electric charge of +⅔, baryon number of ⅓, zero isotopic spin, strangeness, and charm, and a new quantum number associated with it. Also known as t quark; truth quark. Symbolized t.
References in periodicals archive ?
The new precise value of the top-quark mass will allow scientists to test further the mathematical framework that describes the quantum connections between the top quark, the Higgs particle and the carrier of the electroweak force, the W boson.
0] mixing (the top quark mass was thought to be much less than 100 GeV at that time) and it would be difficult to measure because of the presumably short life time of B-meson.
Thus, since the mass of the top quark is about 173 GeV and this quantity is by far greater than the mass of any other quark, it makes sense to regard the 125 GeV particle as a t[bar.
Tevatron experiments discovered the top quark, made precision measurements of the W boson mass, observed B_s mixing and set many limits on potential new physics theories.
The discovery of single top quark production fills in a major piece of the puzzle in particle physics and solidifies our understanding of the basic components of matter," said MSU (Michigan State University) assistant physics professor Reinhard Schwienhorst.
The top quark turned out to be much heavier than we originally thought," says Meenakshi Narain, a particle physicist at Brown University in Providence, R.
The Tevatron has found signs that the top quark (the heaviest fundamental particle) and its antimatter partner, the antitop quark, prefer to move in opposite directions.
Washington, March 10 (ANI): A scientist of Indian origin has played a key role in discovering particle collisions that produce a single top quark, one of the fundamental constituents of matter.
Those highlights include the 1995 discovery of the top quark, the sixth and last discovered quark predicted to exist according to current theory.
report that the mass that physicists had assigned to a different subatomic particle, the top quark, is too low.
Using this method, physicists have accurately estimated properties of elusive particles, such as the top quark, prior to discovery (SN: 7/1/95, p.
The top quark, however, doesn't survive long enough to allow meson formation (SN: 7/1/95, p.