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|discovered = [[SLAC]] (1968)
|symbol = {{SubatomicParticle|Down quark}}
|mass =
{{cite web
|author=
|url=http://
|title=PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b', t', Free)'
|publisher=[[Particle Data Group]]
|year=
|accessdate=
}}</ref>
|decay_time =
|decay_particle = [[Up quark]]
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}}
The '''down quark''' or '''d quark''' (from its symbol, ''d'') is the second-lightest of all [[quark]]s, a type of [[elementary particle]], and a major constituent of [[matter]]. It, along with the [[up quark]], forms the [[neutron]]s (one up quark, two down quarks) and [[proton]]s (two up quarks, one down quark) of [[atomic nucleus|atomic nuclei]]. It is part of the [[generation (physics)|first generation]] of matter, has an [[electric charge]] of −{{frac|1|3}} [[elementary charge|e]] and a [[Quark#Mass|bare mass]] of
Its existence (and that of the [[up quark|up]] and [[strange quark]]s) was postulated in 1964 by [[Murray Gell-Mann]] and [[George Zweig]] to explain the ''[[Eightfold Way (physics)|Eightfold Way]]'' classification scheme of [[hadron]]s. The down quark was first observed by experiments at the [[Stanford Linear Accelerator Center]] in 1968.
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==Mass==
Despite being extremely common, the
== See also ==
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