Quark masses with Nf=2 twisted mass lattice QCD
Abstract
We present the results of the recent high precision lattice calculation of the average up/down, strange and charm quark masses performed by ETMC with Nf=2 twisted mass Wilson fermions. The analysis includes data at four values of the lattice spacing and pion masses as low as ~270 MeV, allowing for accurate continuum limit and chiral extrapolation. The strange and charm masses are extracted by using several methods, based on different observables: the kaon and the etas meson for the strange quark and the D, Ds and etac mesons for the charm. The quark mass renormalization is carried out non-perturbatively using the RI-MOM method. The results for the quark masses in the MSbar scheme read: mud(2 GeV)= 3.6(2) MeV, ms(2 GeV)=95(6) MeV and mc(mc)=1.28(4) GeV. We have also obtained the ratios ms/mud=27.3(9) and mc/ms=12.0(3). Moreover, we provide the updated result for the bottom quark mass, mb(mb)=4.3(2) GeV, obtained using the method presented in 0909.3187 [hep-lat].
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