The advanced research in the field of physics and particularly sub-atomic particles has revealed the existence of elementary particles. Proton, with quark structure uud ('up up down', referring to the three quarks making up the proton.) Be on the lookout for your Britannica newsletter to get trusted stories delivered right to your inbox. Many families and sub-families of elementary particles exist. Hadrons are subject to the strong nuclear force, they are not fundamental particles as they are made up of quarks. They are subject to the strong nuclear force and they are not fundamental particles as they are made up of quarks. Fermion particles are described by Fermi–Dirac statistics and have quantum numbers described by the Pauli exclusion principle. 'up', 'down', 'strange'). Thus in the modern world, the quark content is the only thing that identifies a hadron as a baryon or a meson. Introduced by many extensions of the Standard Supermodel, and may be needed to explain the. Ordinary baryons (composite fermions) contain three valence quarks or three valence antiquarks each. A baryon is a type of hadron, and it contains three quarks. Hadrons are subject to the strong nuclear force, they are not fundamental particles as they are made up of quarks.

Hadron is defined as the subatomic particle made of quarks, gluons and anti-quarks. The electrical charge of a single quark is always a fraction (e.g. Examples of mesons include the pion, kaon, and the J/ψ.

For a chronological listing of subatomic particles by discovery date, see Timeline of particle discoveries. All observed subatomic particles are hadrons except for the gauge bosons of the fundamental interactions and the leptons. Nuclear reactions can change one nuclide into another.

This means that they contain quarks. Quarks are fundamental particles which among other properties have an electrical charge and a name (e.g. Our editors will review what you’ve submitted and determine whether to revise the article. According to the current standard model there are 6 flavours of quarks. All the particles of the Standard Model have been experimentally observed, recently including the Higgs boson in 2012.

The three classes of particles are hadrons, mesons and baryons. - Hadrons, Baryons, and Mesons", https://simple.wikipedia.org/w/index.php?title=Hadron&oldid=7146201, Creative Commons Attribution/Share-Alike License. See Article History. Baryons (fermions) For a detailed list, see List of baryons.