Excited States in Staggered Meson Propagators

TL;DR

This paper presents preliminary multi-particle fit results for meson propagators with three light dynamical quarks, identifying excited states and decay channels, thus providing insights into meson spectroscopy and action locality.

Contribution

It reports the first measurements of excited states in meson propagators with three flavors of light dynamical quarks, including the pion 2S state and decay channel evidence.

Findings

Identification of the pion 2S excited state.

Evidence of decay channels in a_0 propagators.

Support for the locality of the lattice action.

Abstract

We report on preliminary results from multi-particle fits to meson propagators with three flavors of light dynamical quarks. We are able to measure excited states in propagators with pion quantum numbers, which we interpret as the pion 2S state, and is evidence of locality of the action. In the a_0 (0^{++}) propagators we find evidence for excited states which are probably the expected decay channels, pi+eta and K+Kbar.