Physicists have developed a theory called the Standard Model that explains what the world is and what holds it together.
It is a theory that explains all the hundreds of particles and complex interactions with only:
- 6 Quarks
- 6 Leptons (such as the electron)
- Force carrier particles (like the photon)
All the known matter particles are leptons or composites made of quarks, and the interact by exchanging force carrier particles.
A primary goal of ATLAS is to look for discoveries that the Standard Model cannot explain.