Quenched Scaling of Wilson twisted mass fermions

Details Quenched Scaling of Wilson twisted mass fermions Quenched Scaling of Wilson twisted mass fermions

2005-07-12

arxiv.org/abs/hep-lat/0507010v1

JHEP0509:071,2005

Physics

High Energy Physics

High Energy Physics - Lattice

20 pages, 5 figures

Scientific paper

10.1088/1126-6708/2005/09/071

We investigate the scaling behaviour of quenched Wilson twisted mass fermions at maximal twist applying two definitions of the critical mass. The first definition uses the vanishing of the pseudoscalar meson mass m_PS while the second employs the vanishing of the PCAC quark mass m_PCAC. We confirm in both cases the expected O(a) improvement. In addition, we show that the PCAC quark mass definition leads to substantially reduced O(a^2) cut-off effects even when the pseudoscalar meson mass m_PS is as small as 270 MeV. At a fixed value of m_PS we perform continuum limits for the vector meson mass m_V and for the pseudoscalar decay constant f_PS and discuss the renormalisation constant Z_V of the vector current.

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