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Chiral perturbation theory vs. linear sigma model in a chiral imbalance medium

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We 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.

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cc-by (c) Andrianov, Alexander A. et al., 2020

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Articles publicats en revistes (Física Quàntica i Astrofísica)

# metadata.dc.title[].value
Chiral perturbation theory vs. linear sigma model in a chiral imbalance medium