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We present results for a test of a mixed action approach withOsterwalder-Seiler valence quarks on a Wilson twisted mass sea for the example{\eta}, {\eta}' mesons. Flavour singlet pseudoscalar mesons obtain significantcontributions from disconnected diagrams and are, therefore, expected to beparticularly sensitive to mixed regularisations. We employ different proceduresfor matching valence and sea quark actions and show that the results agree inthe continuum limit.

Investigating a mixed action approach for {\eta} and {\eta}' mesons in Nf=2+1+1 lattice QCD