Bottom quark
The bottom quark is a third-generation
quark with a charge of -(1/3)
e. Although all quarks are described in a similar way by the
theory of
quantum chromodynamics, the bottom quark's large mass (around 4
GeV, or four times the mass of a
proton), combined with low values of the
CKM matrix elements Vub and Vcb, gives it a distinctive signature that makes it relatively easy to identify experimentally (using a technique called
B-tagging). Because three generations of quark are required for
CP violation (see
CKM matrix for an explanation of why),
mesons containing the bottom quark are the easiest particles to use to investigate the phenomenon; this is being done at the
BaBar and
Belle experiments. The bottom quark is also notable because it is a product in almost all
top quark decays, and a frequent decay product for the hypothetical
Higgs boson if it is sufficiently light.
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Quark bottom
Quark (Physik)
Kwark spodni
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