Journal
COMPUTER PHYSICS COMMUNICATIONS
Volume 220, Issue -, Pages 97-121Publisher
ELSEVIER
DOI: 10.1016/j.cpc.2017.06.021
Keywords
Lattice QCD; Spectroscopy methods; Tetraquark
Funding
- Emmy Noether Programme of the DFG (German Research Foundation) [WA 3000/1-1]
- Theoretical Physics Department at CERN
- Helmholtz International Center for FAIR of the LOEWE program
- European Regional Development Fund
- Republic of Cyprus through the Research Promotion Foundation [Cy-Tera gammaPiODeltaOMH/SigmaTPATH/0308/31]
- State Ministry of Higher Education, Research and the Arts, for programming advice
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We discuss and compare the efficiency of various methods, combinations of point-to-all propagators, stochastic timeslice-to-all propagators, the one-end trick and sequential propagators, to compute two point correlation functions of two-quark and four-quark interpolating operators of different structure including quark-antiquark type, mesonic molecule type, diquark-antidiquark type and two-meson type. Although we illustrate our methods in the context of the a(0\)(980), they can be applied for other multi quark systems, where similar diagrams appear. Thus our results could provide helpful guidelines on the choice of methods for correlation function computation for future lattice QCD studies of meson-meson scattering and possibly existing tetraquark states. (C) 2017 Elsevier B.V. All rights reserved.
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