Including Tetraquark Operators in the Low-Lying Scalar Meson Sectors in Lattice QCD

Abstract

Lattice QCD allows us to probe the low-lying hadron spectrum in finite-volume using a basis of single- and multi-hadron interpolating operators. Here we examine the effect of including tetraquark operators on the spectrum in the scalar meson sectors containing the $K_0^{\ast }(700)$ ($\hat{I}º$) and the $a_0(980)$ in $N_f=2+1$ QCD, with $m_{\ddot{I}}€\approx 230$ MeV. Preliminary results of additional finite-volume states found using tetraquark operators are shown, and possible implications of these states are discussed.

6 pages, 4 figures, proceedings for The 15th International Conference on Meson-Nucleon Physics and the Structure of the Nucleon, MENU-2019