ALP-Pions generalized

• DOI: 10.48550/arxiv.2112.13147
• Publication Date: 2021-01-01
• Authors: Triparno Bandyopa...; Subhajit Ghosh; Tuhin S. Roy
• Keywords: Parity (physics)

A light axion-like particle or an ALP not just gives rise to interesting and spectacular signals of new physics as final states in meson decays, it necessarily leaves tell-tale signatures processes that involve standard model (SM) fields only (i.e., SM processes). These effects result the violation Gell-Mann--Okubo mass relation, modified form factors, altered integrated differential rates for various transitions etc. This suggests presence a low lying state, such ALP, extraction masses, mixing angles, factors entirely data-driven way from meson-physics observables is highly non-trivial exercise. However, once done correctly, these same may, turn, provide important (indirect) bounds on physics, which remain robust even limits where conspire weaken direct searches. Starting with generalized ALP-quark Lagrangian (where restrictions due parity are removed) we demonstrate this approach by focussing $K^+_{\ell_3}$ derive using NA48/2 data lattice results. We also find sum rules show deviations but give hints towards specific nature itself.