We perform a Wilson Chiral Perturbation Theory (WChPT) analysis of quenched
twisted mass lattice data. The data were generated by two independent groups
with three different choices for the critical mass. For one choice, the
so-called pion mass definition, one observes a strong curvature for small quark
masses in various mesonic observables (''bending phenomenon''). Performing a
combined fit to the next-to-leading (NLO) expressions, we find that WChPT
describes the data very well and the fits provide very reasonable values for
the low-energy parameters.Comment: 3 pages, 4 ps figures. Talk given by O. Bar at QNP '06, Madri
