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| Hauptseite > Publikationsdatenbank > Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations |
| Hauptseite > Publikationsdatenbank > Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations |
| Journal Article | PreJuSER-48252 |
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2005
North Holland Publ. Co.
Amsterdam
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Please use a persistent id in citations: doi:10.1016/j.cpc.2005.03.085
Abstract: We present results of our ongoing determination of "string breaking" in quantum chromodynamics (QCD) including two dynamical light quarks. Our investigation of the fission of the string between a heavy (static) quark and a corresponding antiquark into a meson-antimeson system is based on dynamical configurations of size 24(3) x 40. The all-to-all light quark propagators occurring in the transition element are computed from a set of 200 low-lying eigenmodes of the Hermitian Wilson-Dirac matrix which encodes the effect of the dynamical quarks. These eigenmodes are calculated on the 1312-node IBM p690 system at the John von Neumann Institute in Julich. Combining the eigenvalue computations with a variety of ground state enhancing optimization methods we determine the matrix elements of the two-by-two system with so far unprecedented accuracy. We observe-for the first time ever in a simulation of 4-dimensional lattice-QCD-level-splitting as the perfect signature for dynamical string breaking between ground state and excited potential. (c) 2005 Elsevier B.V. All rights reserved.
Keyword(s): J ; lattice quantum chromodynamics (auto) ; eigenvalue computation (auto) ; PARPACK (auto)
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