TY  - JOUR
AU  - Attig, N.
AU  - Bali, G. S.
AU  - Düssel, T.
AU  - Lippert, T.
AU  - Neff, H.
AU  - Prkacin, Z.
AU  - Schilling, K.
TI  - Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations
JO  - Computer physics communications
VL  - 169
SN  - 0010-4655
CY  - Amsterdam
PB  - North Holland Publ. Co.
M1  - PreJuSER-48252
SP  - 382 - 385
PY  - 2005
N1  - Record converted from VDB: 12.11.2012
AB  - 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.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000230528100083
DO  - DOI:10.1016/j.cpc.2005.03.085
UR  - https://juser.fz-juelich.de/record/48252
ER  -