Everything about Down Quark totally explained
The
down quark is a first-generation quark with a charge of -(1/3)
e. It is the second-lightest of all quarks. Its bare
mass isn't well determined, but probably lies between 4 and 8
MeV. According to the
Standard Model of
particle physics, it and the
up quark are the fundamental constituents of the
nucleons; the
proton contains one down quark and two up quarks, while the
neutron contains two down quarks and one up quark. Note, however, that the majority of the mass in nucleons comes from the energy in the
gluon field holding the quarks together, and not the quark masses themselves.
Down quarks were named when
Gell-Mann and
Zweig developed the
quark model in
1964, and the first evidence for them was found in
deep inelastic scattering experiments at
SLAC in
1967.
Hadrons containing down quarks
Some of the
hadrons containing down quarks include:
- Charged Pions are mesons containing an up quark and an anti-down quark, or vice versa.
- The neutral pion is a linear combination of up-antiup and down-antidown, as are the and ω mesons.
- The and flavorless mesons are linear combinations of several quark-antiquark pairs, including down-antidown.
- A large number of detected baryons contain one or more down quarks. Like the nucleons, the baryons are made of only up and down quarks: the contains no down quark, but the contains one, the contains two, and the contains three.
Further Information
Get more info on 'Down Quark'.
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