Quarks: Frontiers in Elementary Particle Physics

Quarks: Frontiers in Elementary Particle Physics

1. What is an elementary particle?

   • Elementary depends on the context
     • Chemistry
       • Elements
     • Physics
       • Leptons and Hadrons
         • Yukawa Meson Theory
   • Conservation Laws
     • Qutantities that does not change under certain type of transformations (Invariants)
   • Are real?
     • How we do science?
       • If something smell like a cow, walk like a cow, sleep like a cow and eat like a cow, then shoul be a cow!!!
       • Theory
         • Should be verified by experiments
         • If the theory does not match with the experiment
           • Patch the theory (ugly but effective)
           • Create a new one
         • A good theory
           • Match with the experiments
           • Predict new results
             • Strong confidence

2. Quarks and leptons

   • Gell-Man introduce the concept of quarks
   • Kinds of particles
     • Leptons (light particles)
       • Electron, Neutrino and Muon
     • Hadrons
       • Heavy particles
         • Structure
           • Size
             • "Range of the force"
       • Baryons (3 quarks) Mesons (2 quarks)
   • We can construct a theory over a conservation law