Importance of closed quark loops for lattice QCD studies of tetraquarks
Brida, M. D.
PublisherProceedings of Science (PoS)
SourceProceedings of Science
34th Annual International Symposium on Lattice Field Theory, LATTICE 2016
Google Scholar check
MetadataShow full item record
To investigate the light scalar tetraquark candidate a0(980) (quantum numbers JP =0+), a correlation matrix including a variety of two- and four-quark interpolating operators has to be computed. We discuss efficient techniques to compute the elements of this correlation matrix, in particular diagrams with closed quark loops. Furthermore, we present evidence that such diagrams are not negligible given our precision, and their contribution is essential to obtain physically meaningful results. In particular, we find indications of the existence of an "additional" state around the two-particle thresholds of K+ K̄ and η +π, which could correspond to the a0(980) meson. © Copyright owned by the author(s).