%0 Conference Paper
%A Stump, Andres
%A Green, Jeremy Russell
%T Distillation and position-space sampling for local multiquark interpolators
%J Proceedings of Science / International School for Advanced Studies
%V (LATTICE2024)
%N DESY-24-186
%@ 1824-8039
%C Trieste
%I SISSA
%M PUBDB-2025-00098
%M DESY-24-186
%M arXiv:2412.09246
%M HU-EP-24/41-RTG
%P 094
%D 2024
%Z 10 pages, 3 figures. Talk presented at the 41st International Symposium on Lattice Field Theory (LATTICE2024), 28 July - 3 August 2024, Liverpool, UK
%X Distillation in lattice QCD is a smearing method that uses the lowest eigenvectors of the spatial Laplacian to construct a subspace in which the Dirac operator can be fully inverted. However, local multiquark interpolators are expensive in this framework because the cost of the contractions scales with a high power of the number of Laplacian eigenvectors. To address this, a position-space sampling method within distillation is presented that avoids this cost scaling. Our simulations show that this method works well for meson operators, but also for local tetraquark operators. In a preliminary study, we investigate the relevance of the latter for the ground state energy of the T<sub>cc</sub>(3875)<sup>+</sup> tetraquark. There we find a downward shift in the lowest level when local tetraquark operators are added to a basis of bilocal scattering operators in the variational method. However, this shift is small compared to the error of the energy.
%B The 41st International Symposium on Lattice Field Theory
%C 28 Jul 2024 - 3 Aug 2024, Liverpool (UK)
Y2 28 Jul 2024 - 3 Aug 2024
M2 Liverpool, UK
%F PUB:(DE-HGF)16 ; PUB:(DE-HGF)8
%9 Journal ArticleContribution to a conference proceedings
%R 10.22323/1.466.0094
%U https://bib-pubdb1.desy.de/record/620264