Portal de Periódicos da CAPES

Quenched scaling of Wilson twisted mass fermions

2005; Springer Nature; Volume: 2005; Issue: 09 Linguagem: Inglês

10.1088/1126-6708/2005/09/071

1127-2236

XENON Collaboration, Karl Jansen, Mauro Papinutto, Andrea Shindler, Carsten Urbach, I. Wetzorke,

High-Energy Particle Collisions Research

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 mPS while the second employs the vanishing of the PCAC quark mass mPCAC. 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(a2) cut-off effects even when the pseudoscalar meson mass mPS is as small as 270 MeV. At a fixed value of mPS we perform continuum limits for the vector meson mass mV and for the pseudoscalar decay constant fPS and discuss the renormalisation constant ZV of the vector current.