Light hadron spectroscopy with O(a) improved dynamical fermions

UKQCD Collaboration; Allton, C. R.; Booth, S. P.; Bowler, K. C.; Foster, M.; Garden, J.; Irving, A. C.; Kenway, R. D.; Michael, C.; Peisa, J.; Pickles, S. M.; Sexton, J. C.; Sroczynski, Z.; Talevi, M.; Wittig, H.

Light hadron spectroscopy with O(a) improved dynamical fermions

Authors

Description

We present the first results for the static quark potential and the light hadron spectrum using dynamical fermions at $β=5.2$ 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