Probing the QCD vacuum with flavour singlet objects: $η'$ on the lattice
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We present a study on the direct determination of the $η'$ mass on the full set of SESAM and T$χ$L QCD vacuum configurations with 2 active flavours of Wilson fermions, at $β= 5.6$. We observe a definite dependency of the two-loop correlator on the topological charge sector.
10 pages
10 pages