%0 Journal Article
%A Attig, N.
%A Bali, G. S.
%A Düssel, T.
%A Lippert, T.
%A Neff, H.
%A Prkacin, Z.
%A Schilling, K.
%T Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations
%J Computer physics communications
%V 169
%@ 0010-4655
%C Amsterdam
%I North Holland Publ. Co.
%M PreJuSER-48252
%P 382 - 385
%D 2005
%Z Record converted from VDB: 12.11.2012
%X 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.
%K J (WoSType)
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000230528100083
%R 10.1016/j.cpc.2005.03.085
%U https://juser.fz-juelich.de/record/48252