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Quark model of particle physics
Quark model of particle physics. Computer illustration showing the composite particles and how they are related in the quark model of particle physics. Quarks combine to form hadrons - composite particles categorised into two families: baryons - composed of three quarks, and mesons - composed of a quark-antiquark pair. Each hadron also contains gluons - particles that are responsible for joining the quarks and antiquarks to each other. The number of constituent quarks is not the only difference between baryons and mesons. A baryon hadron is known as a fermion and a meson hadron is known as a boson. Fermions are particles that have half-integer spin, whereas bosons have integer spin. Each form of hadron (baryon, or meson) also has a large number of
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