bottom quark


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Related to bottom quark: charm quark, top quark, up quark, strange quark

bottom quark

[′bäd·əm ‚kwärk]
(particle physics)
A quark with a mass of about 4.7 GeV, electric charge of -⅓, zero isotopic spin, strangeness and charm, and a new quantum number associated with it. Also known as b quark; beauty quark. Symbolized b.
References in periodicals archive ?
The weightiest parts of the particles--known as sigma-b baryons--are called bottom quarks, one of the six types of quarks that are fundamental constituents of matter.
This makes the top quark about 40 times heavier than the bottom quark.
The bottom quark, heaviest of the known quarks, has an experimentally determined mass of about 4.5 GeV, nearly five times that of a proton.
Previous studies of particles with strange quarks and bottom quarks have confirmed as such.
But according to theory, Higgs bosons should decay over half of the time into bottom quarks, the second-heaviest type of quark.
The researchers analyzed the data gathered at the LHC between 2011 and 2012, combining the Higgs decays into bottom quarks and tau leptons, both of which belong to the fermion particle group and the results revealed that an accumulation of these decays comes about at a Higgs particle mass near 125 gigaelectron volts (GeV) and with a significance of 3.8 sigma.
Well if you smash two particles together and make a Higgs it may go on to form, say, two bottom quarks. But like the Greggs analogy there's many ways to afford a pepperoni slice, so buying the pizza isn't an indication of the coinage used.
With this complete set, physicists will be able to cook up quark-gluon plasma, and observe things like bottom quarks and leptons.
"We know exactly what signal we are looking for in our data, and we see strong indications of the production and decay of Higgs bosons in a crucial decay mode with a pair of bottom quarks, which is difficult to observe at the LHC.