Scaling test of quenched Wilson twisted mass QCD at maximal twist
Presenter: Mauro Papinutto
K. Jansen, M. Papinutto, A. Shindler, C. Urbach and I. Wetzorke
Abstract: We present the results of an extended scaling test of quenched Wilson
twisted mass QCD. We fix the twist angle by using two definitions of the critical
mass, the first obtained by the vanishing of m2π for pure Wilson fermions and
the second by requiring restoration of parity and isospin at non zero value of
the twisted mass µ and subsequently extrapolating to µ → 0. Depending on the
choice of the critical mass we simulate at values of β ∈ [5.7, 6.45], for a range of
pseudoscalar masses 250M eV ≤ mP S ≤ 1GeV and we perform the continuum
limit for the pseudoscalar decay constant and the vector meson mass at fixed
value of r0 mP S . For both definitions of the critical mass, lattice artifacts are
consistent with O(a) improvement. However, with the second definition O(a2 )
discretization errors are strongly suppressed even at small quark masses.
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