Probing the QCD vacuum with flavour singlet objects: ${\eta }^{\prime }$ on the lattice

Abstract

We present a study on the direct determination of the ${\eta }^{\prime }$ mass on the full set of SESAM and T$\chi$L QCD vacuum configurations with 2 active flavours of Wilson fermions, at $\beta =5.6$. We observe a definite dependency of the two-loop correlator on the topological charge sector.

10 pages