Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations

Attig, N., Bali, G.S., Dussel, T., Lippert, T., Neff, H., Prkacin, Z. and Schilling, K. (2005) Demonstration of string breaking in quantum chromodynamics by large-scale eigenvalue computations. Computer Physics Communications, 169, pp. 382-385. (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 243×40. 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 Jülich. 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.

• Item Type: Articles
• Status: Published
• Refereed: Yes
• Glasgow Author(s) Enlighten ID: UNSPECIFIED
• Authors: Attig, N., Bali, G.S., Dussel, T., Lippert, T., Neff, H., Prkacin, Z., and Schilling, K.
• College/School: College of Science and Engineering > School of Physics and Astronomy
• Journal Name: Computer Physics Communications