arXiv:hep-lat/0110087·v1·High Energy Physics — Lattice

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

JLQCD Collaboration: N.Yamada🇯🇵 · S.Aoki🇯🇵 · R.Bulkhalter🇯🇵 · M.Fukugita🇯🇵 · S.Hashimoto🇯🇵 · K-I.Ishikawa🇯🇵 · N.Ishizuka🇯🇵 · Y.Iwasaki🇯🇵 · K.Kanaya🇯🇵 · T.Kaneko🇯🇵 · Y.Kuramashi🇯🇵 · M.Okawa🇯🇵

PDF arXiv INSPIRE DOI

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 $β$ =5.2 on a $2 0^{3} \times 48$ 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.