Results from overlap valence quarks on a twisted mass sea

Understand

We present results of lattice computations using overlap fermions on a twisted mass background.

• $N_f=2$ 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 ($a \approx 0.09$ fm) and large volumes ($V/a^4=24^3\times 48$).
• 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.