The existence and properties of the sigma meson have been controversial for almost six
decades, despite playing a central role in the spontaneous chiral symmetry of QCD or in the …

We develop an effective field theory of QCD and QCD-like theories beyond the Standard
Model, based on the hidden local symmetry (HLS) model for the pseudoscalar mesons (π) …

We show that it is possible to construct explicit models of electroweak symmetry breaking in
which the number of techniflavors needed to enter the conformal phase of the theory is small …

Based on a dispersive approach, we apply the inverse amplitude method to unitarize one-
loop SU (2) and SU (3) chiral perturbation theory. Numerically, we find that this unitarization …

We investigate theories in which the technifermions in higher dimensional representations of
the technicolor gauge group dynamically break the electroweak symmetry of the standard …

We use our latest dispersive analysis of π π scattering data and the very recent K ℓ 4
experimental results to obtain the mass, width, and couplings of the two lightest scalar …

We show how to obtain information about the states of an effective field theory in terms of the
underlying fundamental theory. In particular, we analyze the spectroscopic nature of meson …

We introduce the topic of dynamical breaking of the electroweak symmetry and its link to
unparticle physics and cosmology. The knowledge of the phase diagram of strongly coupled …

By using unitarized two-loop chiral perturbation theory partial waves to describe pion-pion
scattering we find that the dominant component of the lightest scalar meson does not follow …

The conception of the conformal phase transiton (CPT), which is relevant for the description
of nonperturbative dynamics in gauge theories, is introduced and elaborated. The main …