A lattice study of light scalar tetraquarks with isopins 0, 1/2 and 1
Sasa Prelovsek
TL;DR
This lattice QCD study investigates the existence of light scalar tetraquarks with various isospins, finding no evidence for such states within the explored pion mass range.
Contribution
First lattice QCD analysis of isospin 1/2 and 1 scalar tetraquarks using Chirally Improved fermions on quenched configurations.
Findings
Ground states match scattering states
Excited states above 2 GeV
No light tetraquarks observed in the studied mass range
Abstract
The observed mass pattern of scalar resonances below 1 GeV gives preference to the tetraquark assignment over the conventional 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. The ground state is consistent with the scattering state, while the two excited states have energy above 2 GeV. Therefore we find no indication for light tetraquarks at our range of pion masses 344-576 MeV.
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Taxonomy
TopicsQuantum Chromodynamics and Particle Interactions · Particle physics theoretical and experimental studies · High-Energy Particle Collisions Research