Talk presented by Rudolf Burkhalter

Parallel Session: QCD Spectrum and Quark Masses I

Tuesday June 29th, 14.50 - 15.10, Auditorium

$\eta\prime$ mass and topology in QCD with two light flavors

Abstract: We present results on a calculation of the mass of the $\eta\prime$ meson in full QCD with two flavors of light quarks using an RG-improved gauge action and a tadpole-improved SW quark action. Calculations are done at four different lattice spacings and four values of the sea quark mass corresponding to $m_{\rm PS}/m_{\rm V} \sim 0.8$--0.6. We compare our results with a corresponding calculation in quenched QCD. In the same calculations we also investigate topological quantities and their dependence on the sea quark mass.

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