Excited hadrons on the lattice: Mesons

TL;DR

This paper reports on lattice QCD calculations of excited meson masses using advanced operator bases to better capture radial excitations, providing insights into hadron structure.

Contribution

It introduces a novel approach with a matrix of correlators and diverse spatial sources to improve excited state identification in lattice QCD.

Findings

Successful extraction of excited meson masses at low pion masses

Enhanced overlap with radial excitations through varied spatial sources

Improved methodology for studying excited hadron states

Abstract

We present results for masses of excited mesons from quenched calculations using chirally improved quarks at pion masses down to 350 MeV. The key features of our analysis are the use of a matrix of correlators from various source and sink operators and a basis which includes quark sources with different spatial widths, thereby improving overlap with states exhibiting radial excitations.