出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We present preliminary results for the charm quark mass mc and the D and Ds mesons decay
constants fD and fDs from a lattice QCD calculation with Nf = 2 dynamical fermions.
We use the twisted mass fermionic action defined at maximal twist so that physical quantities
are automatically O(a) improved. Two lattice spacings are considered. The charm quark
mass has been renormalised in the RI-MOM scheme. After a matching to the MS scheme, we
obtain from the simulation at a fine lattice (a 0:09 fm) mMS
c (mc) = 1:481 0:022 0:092
GeV, fD = 2051317 MeV, fDs = 27166 MeV and from the simulation at the finer
lattice (a 0:07 fm) mMS
c (mc) = 1:474 0:041 0:132 GeV, fD = 230 31 8 MeV and
fDs = 26458 MeV. We chose three renormalisation conditions to determine mc: the spread
between the final results contributes to the systematic error. At both lattice spacings, particularly
at the finer one, the error on mc is dominated by present uncertainty on the renormalisation
constant ZP, which should be reduced before performing a reliable continuum limit.
