Casimir scaling in G(2) lattice gauge theory

Details Casimir scaling in G(2) lattice gauge theory Casimir scaling in G(2) lattice gauge theory

2008-07-09

arxiv.org/abs/0807.1390v2

Phys.Rev.D78:074501,2008

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, 12 figures (24 EPS files), RevTeX4. In v2: typos corrected, discussion of systematic errors and of smearing expanded

Scientific paper

10.1103/PhysRevD.78.074501

We computed potentials between static color sources from the six lowest representations of G(2) lattice gauge theory, in numerical simulations with the Wilson action on asymmetric lattices with nonperturbatively estimated values of the bare anisotropy. We present evidence for (approximate) Casimir scaling of the obtained intermediate string tensions. The agreement with the Casimir-scaling prediction improves by increasing the coupling beta in the weak-coupling region above the crossover observed in G(2) gauge theory. The result naturally fits into confinement models with magnetic disorder and vacuum domain structure, but may represent a challenge for other approaches.

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