出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We report on first results of an ongoing effort to simulate lattice QCD with two degenerate flavours
of quarks by means of the twisted mass formulation tuned to maximal twist. By utilising recent
improvements of the HMC algorithm, pseudo-scalar masses well below 300MeV are simulated
on volumes L3 · T with T = 2L and L > 2fm and at values of the lattice spacing a . 0.1fm.
We present first evidence that scaling violations in the pseudo-scalar decay constant are small
and well compatible with O(a) improvement. Additionally, exploratory results for the case of
Nf = 2+1+1 flavours are discussed.
