Fundamental particle
From Wikinfo
In the Standard Model of particle physics, matter are constituted by 12 particle types and their antiparticles. Matter particules are divided in two classes: quarks and leptons. All other particles, like protons or neutrons are made of quarks, hence the name fundamental particles.
In addition, gluons, photons, W and Z bosons, the force carrier particles for, respectively, the strong, electromagnetic and weak interactions, are also considered as fundamental particles.
References
- Adapted from the Wikipedia article, "Fundamental particle" http://www.wikipedia.org/wiki/Fundamental_particle August 15, 2003
