PoS - Proceedings of Science
Volume 449 - The European Physical Society Conference on High Energy Physics (EPS-HEP2023) - T11 Quantum Field and String Theory
The anomalous Lagrangian in ChPT at NNLO
J. Bijnens, N. Hermansson-Truedsson and J. Ruiz-Vidal*
Full text: pdf
Pre-published on: January 31, 2024
Published on: March 21, 2024
The anomalous Lagrangian in mesonic Chiral Perturbation Theory, of odd intrinsic parity, is determined to next-to-next-to-leading order thereby completing the order $p^8$ Lagrangian. A schematic view of its construction with the MINIBAR package for Mathematica is presented and the final operator count is discussed for a general number of light quark flavours as well as for the physical cases $N_f=2,3$. The number of operators in our explicit construction of the Lagrangian basis is consistent with the number derived using the Hilbert series in the literature.
DOI: https://doi.org/10.22323/1.449.0509
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