Unitarity in technicolor

We investigate the longitudinal WW scattering in models of dynamical electroweak symmetry breaking featuring a spin-one axial and vector state and a composite Higgs boson. We also investigate the effects of a composite spin-two state which has the same properties of a massive graviton. Any model of dynamical electroweak symmetry breaking will feature, depending on the dynamics, some or all of these basic resonances as part of the low energy spectrum. We suggest how to take limits in the effective Lagrangian parameter space to reproduce the dynamics of different types of underlying gauge theories, from the traditional technicolor models to the newest ones featuring nearly conformal dynamics. We study the direct effects of a light composite Higgs boson and the indirect ones stemming from the presence of a light axial resonance on the longitudinal WW scattering. © 2009 The American Physical Society.