Physics of eta-prime with rooted staggered quarks

The quark-mass dependence of the eta in the Schwinger model, which – like the eta-prime in QCD – becomes massive through the axial anomaly, is studied on the lattice with N_f=0,1,2. Staggered quarks are used, with a rooted determinant for N_f=1. In the chiral limit the Schwinger mass is reproduced, which suggests that the anomaly is being treated correctly.