Icon class icon_class fas fa-quote-left icon_class_computed fas fa-quote-left Related content Neutrons and protons are spin-1/2 fermions and baryons Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons Source Wikipedia Copyright information Text from Wikipedia and Wiktionary web pages quoted for educational purposes is subject to the Wikipedia Creative Commons Attribution ShareAlike Licence Snippet kind INFO Previous snippet Full quote Protons are spin-1/2 fermions and are composed of three valence quarks, making them baryons (a sub-type of hadrons). URL https://en.wikipedia.org/wiki/Proton Next snippet The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons. Related snippets The neutron ... is a spin-½ fermion. In particle physics, a baryon is a type of composite subatomic particle which contains an odd number of valence quarks (at least 3). Baryons belong to the hadron family of particles, which are the quark-based particles. They are also classified as fermions, i.e., they have half-integer spin. The most familiar baryons are protons and neutrons, both of which contain three quarks, and for this reason these particles are sometimes described as triquarks. Related snippets (backlinks) Quarks are fermionic particles of spin 1/2 (S = 1/2). Because spin projections vary in increments of 1 (that is 1 ħ), a single quark has a spin vector of length 1/2, and has two spin projections (Sz = +1/2 and Sz = −1/2). Two quarks can have their spins aligned, in which case the two spin vectors add to make a vector of length S = 1 and three spin projections (Sz = +1, Sz = 0, and Sz = −1). If two quarks have unaligned spins, the spin vectors add up to make a vector of length S = 0 and has only one spin projection (Sz = 0), etc. Since baryons are made of three quarks [DISPUTED], their spin vectors can add to make a vector of length S = 3/2, which has four spin projections (Sz = +3/2, Sz = +1/2, Sz = −1/2, and Sz = −3/2), or a vector of length S = 1/2 with two spin projections ... Exotic baryons containing five quarks (known as pentaquarks) have also been discovered and studied. The two up quarks and one down quark of a proton are held together by the strong force, mediated by gluons. A modern perspective has a proton composed of the valence quarks (up, up, down), the gluons, and transitory pairs of sea quarks. Visit also Visit also (backlinks) Flags
