Johan Bijnens, Pierre Dhonte and Pere Talavera
$\pi\pi$ Scattering in Three Flavour
ChPT
hepph/0401039
submitted to JHEP
Abstract
We present the scattering lengths for the $\pi\pi$
processes in the three flavour Chiral Perturbation Theory
(ChPT) framework at nexttonexttoleading order. We then
combine this calculation with the determination of the
parameters from $K_{e4}$ and the masses and decay constants
and compare with the results of a dispersive analysis of
$\pi\pi$ scattering. The comparison indicates a small but
nonzero value for the $1/N_c$ suppressed NLO low energy
constants $L_4^r$ and $L_6^r$.
LU TP 0402
