in Protonen und Neutronen (Baryonen) sind je drei enthalten
in Mesonen sind es zwei.
Nun wurden beim CERN Partikel entdeckt, in den je vier Quarks sich befinden: Tetraquarks
das könnte auch auf die Astrophysik Auswirkungen haben , die Vorstellungen vom Innern der Neutronensterne würden sich ändern.
http://www.universetoday.com/111110/how ... rophysics/
Very simply, the traditional model of a neutron star is that it is made of neutrons. Neutrons consist of three quarks (two down and one up), but it is generally thought that particle interactions within a neutron star are interactions between neutrons. With the existence of tetraquarks, it is possible for neutrons within the core to interact strongly enough to create tetraquarks. This could even lead to the production of pentaquarks and hexaquarks, or even that quarks could interact individually without being bound into color neutral particles. This would produce a hypothetical object known as a quark star.