Partially Quenched Chiral Perturbation Theory to NNLO

TL;DR

This paper presents NNLO calculations of pseudoscalar meson masses and decay constants within Partially Quenched Chiral Perturbation Theory, aiding lattice QCD extrapolations and LEC determination.

Contribution

It provides the first comprehensive NNLO results for pseudoscalar mesons in PQxPT, enhancing precision in chiral extrapolations and low-energy constant extraction.

Findings

Two-loop level mass and decay constant calculations completed

Results applicable to lattice QCD chiral extrapolations

Facilitates determination of QCD low-energy constants

Abstract

This paper summarizes the recent calculations of the masses and decay constants of the pseudoscalar mesons at the two-loop level, or NNLO, in Partially Quenched Chiral Perturbation Theory (PQxPT). Possible applications include chiral extrapolations of Lattice QCD, as well as the determination of the low-energy constants (LEC:s) of QCD.