A lattice study of light scalar tetraquarks with isopins 0, 1/2 and 1

Understand

The observed mass pattern of scalar resonances below 1 GeV gives preference to the tetraquark assignment over the conventional $\bar qq$ assignment for these states.

• We present a search for tetraquarks with isospins 0,1/2,1 in lattice QCD, where isospin channels 1/2 and 1 have not been studied before.
• Our simulation uses Chirally Improved fermions on quenched gauge configurations.
• We determine three energy levels for each isospin using the variational method.