Jf. Donoghue et T. Torma, THE REACTIONS GAMMA-GAMMA-]WL(-) AND GAMMA-GAMMA-]Z(L)Z(L) IN SU(N) STRONGLY INTERACTING THEORIES()WL(), Nuclear physics. B, 424(2), 1994, pp. 399-417
Building on recent phenomenology of gamma gamma --> pi pi, we discuss
the expectation for two-photon production of longitudinal gauge boson
pairs in SU(N) technicolor theories. The treatment involves a matching
of dispersive techniques with the methodology of chiral perturbation
theory.