Hadron

In physics, a hadron is a subatomic particle composed of quarks and gluons.

The class of hadrons is further subdivided into three subclasses.

• Baryons, formed by three quarks, like protons and neutrons
• 'Exotic Baryons', including the pentaquark, a particle of five quarks
• Mesons, formed by configurations quark/antiquark pairs, such as pions and kaons.