What is J/ψ particle?
'''J/ψ mesons''' (pronounced jeɪ/saɪ, English jay/sigh) are [[subatomic particle]]s made of one [[charm quark]] and one [[Antiquark|charm antiquark]]. [[Meson]]s are a family of [[composite particle]]s which are made of one [[quark]] and one [[antiquark]]. It was discovered by [[Burton Richter]] and [[Samuel C. C. Ting]]. The discovery of J/ψ mesons was huge because it revealed the existence of the fourth known quark of the time, the charm quark. J/ψ mesons were used in an attempt to learn more about [[quark-gluon plasma]]s, but no conclusive results were found. The name J/ψ comes from the chosen names from the two labs that found them, one of which chose the letter J, while the other chose the [[greek alphabet|Greek]] letter ψ (psi). {{elementary}} {{physics-stub}} {{DEFAULTSORT:J Meson}} [[Category:Subatomic particles]]