The bottom quark or b quark (from its symbol, b), also known as the beauty quark, is a third-generation quark with a charge of −{frac|1|3} e. Although all quarks are described in a similar way by the quantum chromodynamics, the bottom quark`s large bare mass (around {val|fmt=commas|4.2|ul=GeV/c2}, a bit more than four times the mass of a proton....
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http://en.wikipedia.org/wiki/Bottom_quark
(from the article `quark`) The discovery in the 1970s of the `charm` () and `bottom` () quarks and their associated antiquarks, achieved through the creation of mesons, ... ...+23 and 13, respectively. A third, still heavier pair of quarks consists of top (or truth, ) and bottom (or beauty, ), again with charges of +...
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http://www.britannica.com/eb/a-z/b/98
[
n] - a quark with a charge of -1/3 and a mass about 10,000 times that of an electron
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http://www.webdictionary.co.uk/definition.php?query=bottom%20quark
beauty quark noun a quark with a charge of -1/3 and a mass about 10,000 times that of an electron
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https://www.encyclo.co.uk/local/20974
the quark having electric charge −1/3 times the elementary charge and bottom quantum number −1. It is more massive than the up, down, strange, and charmed quarks. Also called
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https://www.infoplease.com/dictionary/bottom-quark
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