Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2008-09-30
PoS LATTICE2008:102,2008
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, 5 figures, The XXVI International Symposium on Lattice Field Theory July 14-19 2008 Williamsburg, Virginia, USA
Scientific paper
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. 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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