QCD predictions for physical multimeson scattering amplitudes

• DOI: 10.48550/arxiv.2502.14348
• Publication Date: 2025-02-20
• Authors: Sebastian M. Dawid; Zachary T. Draper; Andrew D. Hanlon; Ben Hörz; Colin Morningstar; Fernando Romero-L...; Stephen R. Sharpe; Sarah Skinner
• Keywords: Nuclear Theory (nucl-th); High Energy Physics - Phenomenology; High Energy Physics - Lattice; High Energy Physics - Phenomenology (hep-ph); Nuclear Theory; High Energy Physics - Lattice (hep-lat); FOS: Physical sciences

We use lattice QCD calculations of the finite-volume spectra systems two and three mesons to determine, for first time, three-particle scattering amplitudes with physical quark masses. Our results are combinations $\pi^+$ $K^+$, at a spacing $a=0.063\;$fm, in isospin-symmetric limit. also obtain accurate maximal-isospin two-meson amplitudes, those $\pi^+ K^+$ $2K^+$ being determinations point. Dense obtained using stochastic Laplacian-Heaviside method, analysis leading is done relativistic formalism. Results compared chiral perturbation theory phenomenological fits experimental data, finding good agreement.