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 …

The extraction of two-and three-body hadronic scattering amplitudes and the properties of
the low-lying hadronic resonances from the finite-volume energy levels in lattice QCD …

The QCD vacuum shows the dynamical breaking of chiral symmetry. In the hot and/or dense
QCD medium, the chiral order parameter such as⟨ q¯ q⟩ is expected to change as a …

We use the one-loop chiral perturbation theory π π-scattering amplitude and dispersion
theory in the form of the inverse amplitude method to study the quark-mass dependence of …

The inverse amplitude method is a powerful unitarization technique to enlarge the energy
applicability region of effective Lagrangians. It has been widely used to describe resonances …

We present recent results on a systematic method to calculate transport coefficients for a
meson gas (in particular, we analyze a pion gas) at low temperatures in the context of Chiral …

We use a chiral model for pion interactions, in the inverse amplitude formalism, to perform a
simultaneous analysis of lattice QCD results for pion-pion scattering in all three isospin …

We study the pion mass dependence of the ρ (770) and f 0 (600) masses and widths from
one and two-loop unitarized chiral perturbation theory (ChPT). We show the consistency of …

We calculate the bulk viscosity of the massive pion gas within unitarized chiral perturbation
theory. We obtain a low-temperature peak arising from explicit conformal breaking due to the …

We describe scalar-pseudoscalar partner degeneration at the QCD chiral transition in terms
of the dominant low-energy physical states for the light quark sector. First, we obtain within …