Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2004-09-22
Nucl.Phys.Proc.Suppl.140:609-611,2005
Physics
High Energy Physics
High Energy Physics - Lattice
3 pages, 3 figures, contribution to Lattice 2004
Scientific paper
10.1016/j.nuclphysbps.2004.11.30
We present results of our ongoing determination of string breaking in full QCD with N_f=2 Wilson fermions. Our investigation of the fission of the static quark-antiquark string into a static-light meson-antimeson system is based on dynamical configurations of size 24^3 x 40 produced by the TxL collaboration. Combining various optimization methods we determine the matrix elements of the two-by-two system with so far unprecedented accuracy. The all-to-all light quark propagators occurring in the transition element are computed from eigenmodes of the Hermitian Wilson-Dirac matrix complemented by stochastic estimates in the orthogonal subspace. We observe a clear signature for level-splitting between ground state and excited potential. Thus, for the first time, string breaking induced by sea quarks is observed in a simulation of 4-dimensional lattice-QCD.
Bali Gunnar S.
Duessel Th.
Lippert Th.
Neff Hartmut
Prkacin Zdravko
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