Show Summary Details

Quick Reference

A fundamental particle, of which hadrons are believed to be composed. Quarks have charges that are either +⅔ or −⅓ of the electron's charge, and combine to make elementary particles. Baryons consist of three quarks, and mesons of two. For example, a proton consists of quarks with charges +⅔+⅔ −⅓ = 1 and a neutron consists of three with charges +⅔ −⅔ −⅓ = 0. Eighteen different quarks with various properties are thought to exist, with a corresponding number of antiquarks. An isolated quark has never been observed; quarks appear to exist only in combination as baryons or mesons.

Subjects: Astronomy and Astrophysics.

Reference entries

See all related reference entries in Oxford Index »

Users without a subscription are not able to see the full content. Please, subscribe or login to access all content. subscribe or login to access all content.