Definition
The Standard Model of particle physics is the theoretical framework that describes three of the four known fundamental forces in the universe—the electromagnetic, weak, and strong interactions—while also classifying all known subatomic particles.
Why It Matters
The Standard Model is the ‘periodic table of the subatomic world’; it provides the most precise and rigorously tested framework for understanding the fundamental forces of the universe, serving as the floor for all modern physics.
Core Concepts
- Fermions (Matter Particles): Quarks (up, down, charm, strange, top, bottom) and Leptons (electron, muon, tau, and their corresponding neutrinos).
- Bosons (Force Carriers): Photons (electromagnetism), W and Z bosons (weak force), Gluons (strong force), and the Higgs Boson (which gives other particles mass).
- Symmetry and Gauge Theory: The model is built on mathematical symmetries (SU(3) × SU(2) × U(1)) that dictate the interactions between particles.
- Missing Force: Notably, the Standard Model does not include gravity, which is currently described by General Relativity.