top quark


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Related to top quark: bottom quark

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 ?
However, the fermion mass in the Higgs-fermion vertex enhances the top quark coupling dramatically compared to other channels.
The top quark's huge mass (more than 100 times that of the proton) makes it one of the most important tools in the physicists' quest to understand the nature of the universe.
Although they came up with a proper formula of the CP violation, their conclusion was that the magnitude of the CP asymmetry would be small due to small [B.sup.0]-[[bar.B].sup.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.
I argued that the genius of the physics community would find a cheaper way to float the top quark in electric and magnetic fields long enough to take its picture.
Buras, "QCD corrections to rare K- and B-decays for arbitrary top quark mass," Nuclear Physics B, vol.
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.t] meson.
"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."
In the article titled "Z' and Higgs Boson Production Associated with a Top Quark Pair as a Probe of the U[(1).sub.B-L] Model at [e.sup.+][e.sup.-] Colliders" [1], the name of the first author was given incorrectly as F.
Higgs bosons can decay in multiple ways; in one scenario, a Higgs transforms into a top quark or a W boson, either of which would in turn immediately break up into two long-lived, detectable photons.
Each chromatic pentad also contains three matrices corresponding to three coordinates and two mass matrices--one for top quark and another--for bottom quark.