B meson B-parameters and the decay constant in two-flavor dynamical QCD

Details B meson B-parameters and the decay constant in two-flavor dynamical QCD B meson B-parameters and the decay constant in two-flavor dynamical QCD

2001-10-15

arxiv.org/abs/hep-lat/0110087v1

Nucl.Phys.Proc.Suppl.106:397-399,2002

Physics

High Energy Physics

High Energy Physics - Lattice

3 pages, 3 figures, Lattice2001(heavyquark)

Scientific paper

10.1016/S0920-5632(01)01726-1

We present a two-flavor dynamical QCD calculation of the B meson B parameters and decay constant. We use NRQCD for heavy quark and the nonperturbatively O(a)-improved Wilson action for light quark at $\beta$=5.2 on a $20^3\times 48$ lattice. We confirm that the sea quark effect increases the heavy-light decay constant, while estimate of its magnitude depends significantly on the fitting form in the chiral extrapolation. For the B parameters, on the other hand, we do not find a significant sea quark effect. The chiral extrapolation with logarithmic term is examined for both quantities and compared with the prediction of ChPT.

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