$K\pi$ scattering and excited meson spectroscopy using the stochastic LapH method

Abstract

Elastic $I=1/2$, $s$- and $p$-wave $K\pi$ scattering amplitudes are simultaneously calculated using a Lüscher style analysis on a single ensemble of dynamical Wilson-clover fermions at $m_{\pi }\sim 230$ MeV. Partial wave mixing due to the reduced rotational symmetries of the finite volume is included up to $\ell =2$. We also present finite-volume QCD spectra on two large anisotropic lattices ($32^3\times 256$, $24^3\times 128$) with $m_{\pi }\sim 230,390$ MeV respectively. In each symmetry channel, a large basis of one- and two-hadron interpolating operators is employed with all-to-all quark propagation treated using the stochastic LapH method.

Comments: 7 pages, proceedings for the 36th International Symposium on Lattice Field Theory (22-28 July 2018); references updated