Andrianov, Alexander A.Andrianov, Vladimir A.Espriu, D. (Domènec)2021-06-092021-06-092020-01-08https://hdl.handle.net/2445/178181We compare the chiral perturbation theory (ChPT) and the linear sigma model (LSM) as realizations of low energy quantum chromodynamics (QCD) for light mesons in a chirally-imbalanced medium. The relations between the low-energy constants of the chiral Lagrangian and the corresponding constants of the linear sigma model are established as well as the expressions for the decay constant of π -meson in the medium and for the mass of the a0. In the large Nc count taken from QCD the correspondence of ChPT and LSM is remarkably good and provides a solid ground for the search of chiral imbalance manifestations in pion physics. A possible experimental detection of chiral imbalance (and therefore a phase with local parity breaking) is outlined in the charged pion decays inside the fireball.8 p.application/pdfengcc-by (c) Andrianov, Alexander A. et al., 2020https://creativecommons.org/licenses/by/4.0/QuiralitatPertorbació (Dinàmica quàntica)ChiralityPerturbation (Quantum dynamics)info:eu-repo/semantics/article7125512021-06-09info:eu-repo/semantics/openAccess