Studying chiral imbalance using Chiral Perturbation Theory

Abstract

We analize the most general low-energy effective lagrangian including local parity violating terms parametrized by an axial chemical potential ${\mu }_5$. This result is obtained following the external source method, up to $\mathcal{O}(p^4)$ order in the chiral expansion for two light flavours. We show that the $\mathcal{O}(p^4)$ lagrangian includes new terms proportional to ${\mu }_5^2$ and new low-energy constants. Finally, the ${\mu }_5$ and temperature dependences of several observables related to the vacuum energy density are studied.

Comments: Proceedings of the Workshop "PANIC2021"