WW Scattering Parameters via Pseudoscalar Phase Shifts
  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. 
Thomas Appelquist, Ron Babich, Richard C. Brower, Michael I. Buchoff,   Michael Cheng, Michael A. Clark, Saul D. Cohen, Geor...
hep-lat hep-ph