Down quark



Down Quark
Composition: c2
Electric charge: -1/3 e
Spin: ½

The down gluon field holding the quarks together, and not the quark masses themselves.)

Down quarks were named when Gell-Mann and Zweig developed the deep inelastic scattering experiments at SLAC in 1967.

Hadrons containing down quarks

Some of the hadrons containing down quarks include:

  • Charged up quark and an anti-down quark, or vice versa.
  • The neutral pion (π0) is a linear combination of up-antiup and down-antidown, as are the ρ and ω mesons.
  • The η and η' flavorless mesons are linear combinations of several quark-antiquark pairs, including down-antidown.
  • A large number of detected nucleons, the Δ baryons are made of only up and down quarks: the Δ+ contains one down quark, the Δ0 contains two, and the Δ− contains three.

See also

  • Isospin
v • d • e
Polaron
 
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