Standard Model of Particle Physics

Standard Model of Particle Physics

Insert the diagram

Lepton

  • No quarks

Lepton Number Conservation

$$ \mu \rightarrow e^- + \nu_\mu + \bar{\nu_e} \quad \Leftrightarrow \quad 1 = 1 + 1 - 1 $$
  • GRE Physics GR0177: Problem 078

Baryon

  • 3 quarks

Meson

  • 1 quark + 1 anti-quark

For example,

  • $J/\psi$ meson: charm quark + anti-charm quark
  • GRE Physics GR0877: Problem 073

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