strange particle

{{Short description|Elementary particle}}

A strange particle is an elementary particle with a strangeness quantum number different from zero. Strange particles are members of a large family of elementary particles carrying the quantum number of strangeness, including several cases where the quantum number is hidden in a strange/anti-strange pair, for example in the Φ meson. The classification of particles, as mesons and baryons, follows the quark/anti-quark and three quark content respectively. Murray Gell-Mann recognized the group structure of elementary particle classification introducing the flavour SU(3) and strangeness as a new quantum number.{{Cite journal|last=Gell-Mann|first=M.|year=1982|title=Strangeness|url=http://www.edpsciences.org/10.1051/jphyscol:1982825|journal=Le Journal de Physique Colloques|volume=43|issue=C8|pages=C8–395–C8-408|doi=10.1051/jphyscol:1982825|issn=0449-1947|archive-url=https://hal.archives-ouvertes.fr/jpa-00222385/|archive-date=30 April 2010}}{{Citation|last=Rochester|first=George D.|title=Early History of Cosmic Ray Studies |chapter=The Early History of the Strange Particles |date=1985|url=http://link.springer.com/10.1007/978-94-009-5434-2_31|series=Astrophysics and Space Science Library|volume=118|pages=299–321|editor-last=Sekido|editor-first=Yataro|publisher=Springer Netherlands|doi=10.1007/978-94-009-5434-2_31|bibcode=1985ASSL..118..299R|isbn=978-94-010-8899-2|access-date=2020-05-06|editor2-last=Elliot|editor2-first=Harry|url-access=subscription}}{{Cite journal|last=Wroblewski|first=A.K.|year=2004|title=Hypernuclei (and Strange Particles) — How It All Began?|url=https://www.actaphys.uj.edu.pl/R/35/3/901/pdf|journal=Acta Phys. Pol. B|volume=35|pages=901}}{{Cite book|last=Griffiths|first=David|url=https://books.google.com/books?id=Wb9DYrjcoKAC|title=Introduction to Elementary Particles|publisher=John Wiley & Sons|isbn=978-3-527-61847-7|pages=28–33|language=en|quote=Strange particles (1947-1960)|year=1987}}{{Cite book|last1=Adair|first1=Robert Kemp|url=https://books.google.com/books?id=lYZ5AAAAIAAJ|title=Strange particles|last2=Fowler|first2=Earle Cabell|date=1963|publisher=Interscience Publishers|language=en}}