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Topological susceptibility and chiral condensate with $N_f=2+1+1$ dynamical flavors of maximally twisted mass fermions (1111.3322v2)

Published 14 Nov 2011 in hep-lat

Abstract: We study the 'spectral projector' method for the computation of the chiral condensate and the topological susceptibility, using $N_f=2+1+1$ dynamical flavors of maximally twisted mass Wilson fermions. In particular, we perform a study of the quark mass dependence of the chiral condensate $\Sigma$ and topological susceptibility $\chi_{top}$ in the range $270 MeV < m_{\pi} < 500 MeV$ and compare our data with analytical predictions. In addition, we compute $\chi_{top}$ in the quenched approximation where we match the lattice spacing to the $N_f=2+1+1$ dynamical simulations. Using the Kaon, $\eta$ and $\eta{\prime}$ meson masses computed on the $N_f=2+1+1$ ensembles, we then perform a preliminary test of the Witten-Veneziano relation.

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