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001     618792
005     20250112114330.0
024 7 _ |a arXiv:2412.09246
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024 7 _ |a 10.3204/PUBDB-2024-07153
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037 _ _ |a PUBDB-2024-07153
041 _ _ |a English
088 _ _ |a DESY-24-186
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088 _ _ |a arXiv:2412.09246
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100 1 _ |a Stump, Andres
|0 P:(DE-H253)PIP1107770
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245 _ _ |a Distillation and position-space sampling for local multiquark interpolators
260 _ _ |c 2024
336 7 _ |a Preprint
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336 7 _ |a preprint
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336 7 _ |a ARTICLE
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500 _ _ |a 10 pages, 3 figures. Talk presented at the 41st International Symposium on Lattice Field Theory (LATTICE2024), 28 July - 3 August 2024, Liverpool, UK
520 _ _ |a 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 $T_{cc}(3875)^+$ 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.
536 _ _ |a 611 - Fundamental Particles and Forces (POF4-611)
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536 _ _ |a GRK 2575 - GRK 2575: Überdenken der Quantenfeldtheorie (417533893)
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700 1 _ |a Green, Jeremy Russell
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910 1 _ |a External Institute
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910 1 _ |a Deutsches Elektronen-Synchrotron
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913 1 _ |a DE-HGF
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|l Matter and the Universe
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914 1 _ |y 2024
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915 _ _ |a Published
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980 _ _ |a preprint
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