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|discovered = {{nowrap|[[Burton Richter]] ''et al.'' ([[SLAC]])}}<br>(1974)<br>{{nowrap|[[Samuel C. C. Ting|Samuel Ting]] ''et al.'' ([[Brookhaven National Laboratory|BNL]])}}<br>(1974)
|symbol = {{SubatomicParticle|Charm quark}}
|mass = {{val|1.27|+0.07|-0.
{{cite web
|author=
|url=http://pdg.lbl.gov/2010/tables/rpp2010-sum-quarks.pdf
|year=2009▼
|title=PDGLive Particle Summary 'Quarks (u, d, s, c, b, t, b', t', Free)'
|publisher=[[Particle Data Group]]
|accessdate=
}}</ref>
|decay_time =
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The '''charm quark''' or '''c quark''' (from its symbol, ''c'') is the third most massive of all [[quark]]s, a type of [[elementary particle]], and a major constituent of [[matter]]. Charm quarks are found in [[hadron]]s, which are [[subatomic particle]]s made of quarks. Example of hadrons containing charm quarks include the [[J/ψ]] meson ({{SubatomicParticle|J/Psi}}), [[D meson]]s ({{SubatomicParticle|D}}), [[charmed Sigma baryon]]s ({{SubatomicParticle|charmed Sigma}}), and other [[charmed particle]]s.
It, along with the [[strange quark]] is part of the [[generation (physics)|second generation]] of matter, and has an [[electric charge]] of +{{frac|2|3}} [[elementary charge|e]] and a [[Quark#Mass|bare mass]] of {{val|1.27|+0.07|-0.
The existence of a fourth quark had been speculated by a number of authors around 1964 (for instance by [[James Bjorken]] and [[Sheldon Lee Glashow|Sheldon Glashow]]<ref>
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