1301.1399 (Zhi-Gang Wang)

Analysis of the decay constants of the heavy pseudoscalar mesons with
QCD sum rules    [PDF]

Zhi-Gang Wang

In this article, we recalculate the contributions from the vacuum condensates up to dimension-6, including the one-loop corrections to the quark condensates $\alpha_s<\bar{q}q>$ and partial one-loop corrections to the four-quark condensates $\alpha_s^2<\bar{q}q>^2$, in the operator product expansion, then study the masses and decay constants of the pseudoscalar mesons $D$, $D_s$, $B$ and $B_s$ with the QCD sum rules. The predictions $f_D=(208\pm11) \rm{MeV}$ and $f_B=(189\pm15) \rm{MeV}$ are consistent with the experimental data within uncertainties, while the prediction $f_{D_s}=(241\pm12) \rm{MeV}$ is still below the lower bound of the experimental data $f_{D_s}=(260.0\pm5.4) \rm{MeV}$.

View original: http://arxiv.org/abs/1301.1399