出版社：SISSA, Scuola Internazionale Superiore di Studi Avanzati
摘要：We calculate the B meson decay constant fB and the ratio fBs fB in full QCD using the MILC
collaboration unquenched gauge congurations. We employ a nonrelativistic QCD action for
the heavy b quark and the highly improved (AsqTad) staggered quark action for the light sea
and valence quarks. The good chiral properties of the latter action allow for an accurate chiral
extrapolation to physical up and down quarks.
