2021/11/15 by Morningstar, Colin, Bulava, John, Hanlon, Andrew D. +5
#FOS: Physical sciences #High Energy Physics - Lattice (hep-lat)
paper · doi:10.48550/arxiv.2111.07755
Progress in computing various meson-baryon scattering amplitudes is presented on a single ensemble from the Coordinated Lattice Simulations (CLS) consortium with mπ=200 MeV and Nf=2+1 dynamical fermions. The finite-volume Lüscher approach is employed to determine the lowest few partial waves from ground- and excited-state energies computed from correlation matrices rotated in a single pivot using a generalized eigenvector solution. This analysis requires evaluating matrices of correlation functions between single- and two-hadron interpolating operators which are projected onto definite spatial momenta and finite-volume irreducible representations. The stochastic LapH method is used to estimate all needed quark propagators. Preliminary results are presented for I=(1)/(2), (3)/(2) Nπ amplitudes including the Δ(1232) resonance and the I=0 S-wave amplitude with unit strangeness relevant for the Λ(1405).