  Using domain-wall lattice simulations, we study pseudoscalar-pseudoscalar
scattering in the maximal isospin channel for an SU(3) gauge theory with two
and six fermion flavors in the fundamental representation. This calculation of
the S-wave scattering length is related to the next-to-leading order
corrections to WW scattering through the low-energy coefficients of the chiral
Lagrangian. While two and six flavor scattering lengths are similar for a fixed
ratio of the pseudoscalar mass to its decay constant, six-flavor scattering
shows a somewhat less repulsive next-to-leading order interaction than its
two-flavor counterpart. Estimates are made for the WW scattering parameters and
the plausibility of detection is discussed.
