出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present results of lattice computations using overlap fermions on a twisted mass background.
Nf = 2 full QCD gauge configurations have been produced by the ETM Collaboration with very
light pions (down to less than 300 MeV), with small lattice spacing (a ≈ 0.09 fm) and large
volumes (V/a4 = 243×48). By profiting of the good chiral properties of the overlap operator for
the valence quarks, it is also possible to have a precise (and unquenched) determination of those
physical quantities where the chiral properties are crucial. In order to have unquenched results,
we match the valence quark mass with the sea quark mass. We also perform computations with
different quark masses in order to simulate (partially quenched) Strange and Charm quarks. A
typical application is the computation of BK, for which we present first results.
