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23 papers · 2 filters
Anomalies and WZW-term of two-flavour QCD
Roland Kaiser
The U(2)_R x U(2)_L symmetry of QCD with two massless flavours is subject to anomalies which affect correlation functions involving the singlet currents A^0_μor V^0_μ. These are re…
The Center symmetry and its spontaneous breakdown at high temperatures
K. Holland, U. -J. Wiese
We examine the role of the center Z(N) of the gauge group SU(N) in gauge theories. In this pedagogical article, we discuss, among other topics, the center symmetry and confinement…
Theoretical Chiral Dynamics
H. Leutwyler
The reasons why a considerable effort is made to resolve the low energy structure of QCD are discussed. The effective field theory used for this purpose is illustrated with the rec…
Chiral perturbation theory and the 1/N_c-expansion
Roland Kaiser
We briefly review the effective theory that describes the low energy properties of QCD with three light quarks and a large number of colours, N_c, and then discuss the mechanisms t…
The decay b -> s g at NLL in the Standard Model
P. Liniger
I present the Standard Model calculation of the decay rate for b -> s g (g denotes a gluon) at next-to-leading logarithms (NLL). In order to get a meaningful physical result, the d…
Non-lattice determinations of the light quark masses
H. Leutwyler
The sum rule determinations of m_s and the chiral perturbation theory results for the ratios m_u/m_d and m_s/m_d are reviewed and a method for the extrapolation of lattice data to…