Topological susceptibility and chiral condensate with maximally twisted mass fermions

by Dr Elena García Ramos (DESY)

Thursday 19 Jan 2012, 15:15 → 17:30 Europe/Rome

Aula Conversi (LNF)

We study the `spectral projector' method for the computation of the the chiral condensate and the topological susceptibility, using 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 $270\;\mathrm{MeV} < m_{\pi} < 500\;\mathrm{MeV}$ and compare our data with the analytical predictions. In addition, we compute $\chi_{top}$ in the quenched approximation where we matched the lattice spacing to the dynamical simulations. Using the Kaon, $\eta$ and $\eta'$ meson masses computed on the dynamical ensembles, we then perform a preliminary test of the Witten-Veneziano relation.