Light hadron spectroscopy with O(a) improved dynamical fermions

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.

Note:

38 pages, 14 Postscript figure, LaTeX Report-no: OUTP-98-53-P

fermion: lattice field theory
gauge field theory: SU(3)
hadron spectroscopy
quark: potential
static
hadron: mass spectrum
mass: sea
effect: finite size
correlation function
mass ratio: (vector meson pseudoscalar meson)

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