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

Abstract

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.

3 pages, 3 figures, Lattice2001(heavyquark)

References in corpus (7)

• O(a) improvement of lattice QCD with two flavors of Wilson quarks
• Quenched Chiral Perturbation Theory for Heavy-light Mesons
• Extraction of the D^*Dπcoupling from D^* decays
• Heavy Quark Physics on the Lattice
• Quenched Chiral Perturbation Theory for Heavy-Light Mesons
• B meson leptonic decay constant with quenched lattice NRQCD
• B^0-\bar{B}^0 mixing with quenched lattice NRQCD

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