Year: 2021
Type: preprint
Abstract: Progress in computing various meson-baryon scattering amplitudes is presented on a single ensemble from the Coordinated Lattice Simulations (CLS) consortium with $m_π=200$ MeV and $N_f=2+1$ 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 $I=\frac{1}{2}, \frac{3}{2}$ $Nπ$ amplitudes including the $Δ(1232)$ resonance and the $I=0$ $S$-wave amplitude with unit strangeness relevant for the $Λ(1405)$.
Source: arXiv (Cornell University)
Authors: Morningstar, Colin, Bulava, John, Hanlon, Andrew D., Hörz, Ben, Mohler, Daniel, Nicholson, Amy, Skinner, Sarah, Walker-Loud, André
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: G1079818582, G111697547, G1143651532, G1286236842, G1863003419, G2013908898, G213222014, G241279073, G2821925151, G3083819904, G357145406, G3685081974, G419881185, G42916606, Hadron-Hadron Interactions and Exotic States using Lattice QCD with the Stochastic LapH Method, G4501827968, G4920325777, G498139845, G5765906131, G6652958823, G7354628648, G7463374569, Hadronstreuung und hadronische Resonanzen aus der Gitterquantenchromodynamik, G872144517, G969889393
OpenAlex ID: W4226065106