LU TP 99-15, hep-ph/9907264
July 1999
Two-point Functions at Two Loops in Three Flavour Chiral Perturbation
Theory
Gabriel Amoros, Johan Bijnens, Pere Talavera
Abstract:
The vector and axial-vector two-point functions are calculated to
next-to-next-to-leading order in Chiral Perturbation Theory for three light
flavours. We also obtain expressions at the same order for the masses,
$m_\pi^2$, $m_K^2$ and $m_\eta^2$, and the decay constants, $F_\pi$, $F_K$
and $F_\eta$. We present some numerical results after a simple resonance
estimate of some of the new ${\cal O}(p^6)$ constants.