
Johan Bijnens, Jie Lu
TwoPoint Functions and SParameter in QCDlike Theories
Abstract
We calculated the vector, axialvector, scalar and pseudoscalar twopoint functions up to twoloop level in the lowenergy effective field theory for three different QCDlike theories. In addition we also calculated the pseudoscalar decay constant $G_M$. The QCDlike theories we used are those with fermions in a complex, real or pseudoreal 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.
LU TP 1140
