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

T. Struckmann, K. Schilling, P. Ueberholz +6

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 $\beta =5.6$.…