arXiv:hep-lat/0010089·v2·High Energy Physics — Lattice
B^0-\bar{B}^0 mixing with quenched lattice NRQCD
JLQCD Collaboration: N. Yamada · S. Aoki · R. Burkhalter · M. Fukugita · S. Hashimoto · K-I. Ishikawa · N. Ishizuka · Y. Iwasaki · K. Kanaya · T. Kaneko · Y. Kuramashi · M. Okawa
Abstract
We present our recent results for the B-parameters, which parameterize the \Delta B=2 transition amplitudes. Calculations are made in quenched QCD at \beta=5.7, 5.9, and 6.1, using NRQCD for heavy quark and the -improved action for light quark. The operators are perturbatively renormalized including corrections of O(\alpha_s/am_Q). We examine scaling behavior of the B-parameters in detail, and discuss the systematic uncertainties using scatter of results with different analysis procedures adopted. As a result, we find B_{B_d}(m_b)=0.84(2)(8), B_{B_s}/B_{B_d}=1.017(10)(^{+4}_{-0}) and B_{S_s}(m_b)=0.87(1)(9)(^{+1}_{-0}) in the quenched approximation.
Comments: Lattice 2000 (Heavy Quark Physics), 4 pages, 4 eps-figures, Latex, typo corrected