To round things off, there are also antimatter anti-leptons for every standard lepton, carrying the opposite charge. The three uncharged leptons are neutrinos. The three charged leptons are electrons, muons and tau. Much like the quarks, there are six leptons. They may carry a negative unit charge (-1) or have no charge (0). They also have a much lower mass than a quark. Leptons are point particles that can exist in isolation, unlike quarks. cosmic rays) are the up quark and the down quark The other quarks are unstable and rapidly decay to the stable up and down quarks. The only quarks that constantly exist outside of experimental conditions or high energy particle collisions (e.g. Quarks possess a partial charge of $\frac$. There are six quarks - up, down, top, bottom, strange and charm there are also six anti-quarks (anti-up and so on). Because they are formed by anti-matter, mesons are extremely unstable. The most commonly encountered meson is the pion, denoted by π⁺. ![]() Quarks may also exist as a pair - one quark, and one anti-quark - known as a meson. A triplet of quarks is known as a baryon. They are bound together by gluons, the force carrier particle of the strong force. Quarks are points of matter that exist with other quarks as a pair or triplet. Quarks only exist in combination with other quarks whereas leptons may exist in isolation. All matter is made up of quarks or leptons.
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