Talk presented by Hugh Shanahan

Parallel Session: Heavy Quarks III

Thursday July 1st, 15.30 - 15.50, Pacinotti Room

Authors: The CP-PACS Collaboration

Heavy-light decay constants from relativistic $N_f=2$ QCD

Abstract: We present results on an analysis of the decay constants $f_B$ and $f_{B{\scriptscriptstyle{s}}}$ with two flavours of sea quark. The calculation has been carried out on three different bare gauge couplings and 4 sea quark masses at each gauge coupling, with $m_\pi/m_\rho$ ranging from 0.8 to 0.6. We employ the Fermilab formalism to perform calculations with heavy quarks whose mass is in the range of the b-quark. As the RG-improved (Iwasaki) gauge action has been used in this calculation, we also present a detailed comparison with a quenched calculation to elucidate the effects due to the sea quarks.

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