Light hadron spectroscopy with O(a) improved dynamical fermions

Abstract

We present the first results for the static quark potential and the light hadron spectrum using dynamical fermions at $\beta =5.2$ using an O(a) improved Wilson fermion action together with the standard Wilson plaquette action for the gauge part. Sea quark masses were chosen such that the pseudoscalar-vector mass ratio, m_PS/m_V$, varies from 0.86 to 0.67. Finite-size effects are studied by using three different volumes, 8^3\cdot 24, 12^3\cdot 24 and 16^3\cdot 24. Comparing our results to previous ones obtained using the quenched approximation, we find evidence for sea quark effects in quantities like the static quark potential and the vector-pseudoscalar hyperfine splitting.

38 pages, 14 Postscript figure, LaTeX

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• Precision computation of a low-energy reference scale in quenched lattice QCD
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• String Breaking in Non-Abelian Gauge Theories with Fundamental Matter Fields
• String breaking in SU(2) gauge theory with scalar matter fields
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