Two-Point Functions and S-Parameter in QCD-like Theories

Abstract

We calculated the vector, axial-vector, scalar and pseudo-scalar two-point functions up to two-loop level in the low-energy effective field theory for three different QCD-like theories. In addition we also calculated the pseudo-scalar decay constant $G_M$. The QCD-like theories we used are those with fermions in a complex, real or pseudo-real representation with in general n flavours. These case correspond to global symmetry breaking pattern of $SU(n{)}_L\times SU(n{)}_R\to SU(n{)}_V$, $SU(2n)\to SO(2n)$ or $SU(2n)\to Sp(2n)$. We also estimated the S parameter for those different theories.

29 pages

References in corpus (2)

• Discovering Technicolor
• Meson-meson Scattering in QCD-like Theories

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• Reducing Hadronic Uncertainty in Low-Energy Neutral-Current Processes