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Abstract: We present results of lattice computations using overlap fermions on atwisted mass background. $N f=2$ full QCD gauge configurations have beenproduced by the ETM Collaboration with very light pions down to less than 300MeV, 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 theoverlap operator for the valence quarks, it is also possible to have a preciseand unquenched determination of those physical quantities where the chiralproperties are crucial. In order to have unquenched results, we match thevalence quark mass with the sea quark mass. We also perform computations withdifferent quark masses in order to simulate partially quenched Strange andCharm quarks. A typical application is the computation of $B K$, for which wepresent first results.



Autor: Nicolas Garron, Luigi Scorzato

Fuente: https://arxiv.org/







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