Sumários

Flavor Physics

18 março 2025, 16:30 • Jan Hajer

  • The CKM Matrix – Standard and Wolfenstein parametrizations, unitarity constraints.
  • CP Violation – Sources of CP violation and its consequences in the Standard Model.
  • Unitarity Triangles – Geometric interpretation of CKM matrix elements.
  • Tree-Level Determination of CKM Parameters – Constraints from weak decays.
  • Flavor-Changing Neutral Currents – Absence at tree level and loop-induced transitions.

MAP1 and Standard Model

12 março 2025, 10:30 • Jan Hajer

MAP1

The Standard Model

  • Flavor Structure – The CKM matrix and fermion mass mixing.
  • Global Symmetries and Parameters – Accidental symmetries and the structure of the SM parameters.

The Standard Model

11 março 2025, 16:30 • Jan Hajer

  • Definition of the Model – Gauge symmetry SU(3)C × SU(2)L × U(1)Y and field content.
  • The Lagrangian – Gauge interactions, fermion structure, and Higgs sector.
  • Spontaneous Symmetry Breaking – Higgs mechanism and generation of particle masses.
  • Particle Spectrum – Quarks, leptons, gauge bosons, and the Higgs boson.
  • Gauge Interactions – Electromagnetic, weak, and strong interactions.
  • Higgs Interactions – Couplings to gauge bosons and fermions.

The Leptonic Standard Model

5 março 2025, 10:30 • Jan Hajer

  • Definition of the Model – Gauge symmetry SU(2)L × U(1)Y and field content.
  • The Lagrangian – Kinetic terms, gauge interactions, and Higgs sector.
  • Spontaneous Symmetry Breaking – The Higgs mechanism and mass generation.
  • Particle Spectrum – Leptons, neutrinos, and electroweak gauge bosons.
  • Electroweak Interactions – Higgs couplings, electromagnetic, and weak interactions.
  • Global Symmetries and Parameter Counting – Accidental symmetries and physical parameters.
  • Low-Energy Tests – Neutrino scattering and experimental constraints.

Spontaneous Symmetry Breaking

26 fevereiro 2025, 10:30 • Jan Hajer

  • Fundamental Concept – Symmetries can be hidden in the vacuum state while remaining present in the Lagrangian.
  • Global Discrete Symmetries – Breaking of Z2 symmetry and emergence of degenerate vacua.
  • Global Continuous Symmetries – U(1) symmetry breaking and the appearance of massless Goldstone bosons.
  • Non-Abelian Global Symmetries – SO(3) symmetry breaking and the structure of vacua.
  • Local Symmetries and the Higgs Mechanism – How gauge bosons acquire mass in spontaneously broken gauge theories.
  • Effective Field Theories and Low-Energy Implications – The impact of symmetry breaking on particle interactions.