Centre for Particle Theory

Flavour Physics and Effective Field Theory


16 Lectures Dr. A. Lenz

Flavour physics observables can provide crucial constraints on extensions of the standard model (SM). Moreover the phenomenon of CP violation, which is supposed to be the key for the understanding of the existence of matter in the universe, was until now only observed in flavour transitions. For any meaningful interpretation of flavour data an understanding of the corresponding SM contribution is mandatory. The general concept of effective theories is also the basis of the theoretical framework for describing hadron decays. The essential premise of effective theories is that dynamics at low energies (or large distances) does not depend on the details of the dynamics at high energies (or short distances). As a result, low energy physics can be described using an effective Lagrangian that contains only a few degrees of freedom, ignoring additional degrees of freedom present at higher energies. In this lecture course several examples of effective theories relevant for flavour physics will be discussed in detail.

Outline of course

  • Flavour phenomenology
  • Fermi theory of weak interactions
  • The effective Hamiltonian
  • The heavy quark expansion (HQE)
  • The heavy quark effective theory (HQET)

Books for the Course

  • A. Manohar and M. Wise, Heavy Quark Physics (Cambridge, 2000)
  • H. Georgi, Weak Interactions and Modern Particle Theory (Dover Pubn Inc, 2009)
  • A. Buras, Weak Hamiltonian, CP violation and rare decays (arXiv: hep-ph/9806471)
  • A. Pich, Effective field theory: Course (arXiv: hep-ph/9806303)