ar X iv : h ep - l at / 9 60 80 05 v 2 1 3 A ug 1 99 6 1 A Study of the Static - Light B B Parameter
نویسنده
چکیده
We calculate the BB parameter, relevant for B 0 –B 0 mixing, from a lattice gauge theory simulation using the static approximation for the heavy quark and the Wilson action for the light quark and gauge fields. Improved sources, produced by an optimized variational technique, most, reduce statistical errors and minimize excited-state contamination of the ground-state signal. Renormalization of four-fermion operator coefficients, using the LepageMackenzie procedure for estimating typical momentum scales, is linearized to reduce order α2s uncertainties.
منابع مشابه
ar X iv : h ep - l at / 9 60 80 05 v 1 1 A ug 1 99 6 1 A Study of the Static - Light B B Parameter
We calculate the BB parameter, relevant for B 0 –B 0 mixing, from a lattice gauge theory simulation using the static approximation for the heavy quark and the Wilson action for the light quark and gauge fields. Improved sources, produced by an optimized variational technique, most, are used to reduce statistical errors and minimize excited-state contamination of the ground-state signal. Renorma...
متن کاملar X iv : h ep - l at / 9 60 80 64 v 1 1 3 A ug 1 99 6 1
We present results for the spectrum and decay constants of B mesons from NRQCD using dynamical configurations at β = 5.6 with two flavours of staggered fermions. The light quarks are generated using the Clover action with tadpole improvement.
متن کاملar X iv : h ep - l at / 9 60 80 65 v 1 1 3 A ug 1 99 6 1 Forces between composite particles in QCD
Starting from the meson-meson Green function in 3+1 dimensional quenched lattice QCD we calculate potentials between heavy-light mesons for various light-quark mass parameters. For the valence quarks we employ the staggered scheme. The resulting potentials turn out to be short ranged and attractive. A comparison with a tadpole improved action for the gauge fields is presented.
متن کاملar X iv : h ep - l at / 9 60 90 05 v 1 3 0 A ug 1 99 6 1 SU ( 3 ) Flavor Breaking in Hadronic Matrix Elements for B − B̄ Oscillations
We present an analysis, using quenched configurations at 6/g 2 =5.7, 5.85, 6.0, and 6.3 of the matrix element M hl ≡ ¯ P hl | ¯ hγµ(1 − γ5)l ¯ hγµ(1 − γ5)l|P hl for heavy-light pseudoscalar mesons. The results are extrapolated to the physical B meson states, B 0 and B 0 s. We directly compute the ratio M bs /M bd , and obtain the preliminary result M bs /M bd = 1.54(13)(32). A precise value of ...
متن کاملar X iv : h ep - l at / 9 60 80 69 v 1 1 3 A ug 1 99 6 1 Calculation of Moments of Nucleon Structure Functions ∗
Preliminary results are presented in our program to calculate low moments of structure functions for the proton and neutron on a 24 3 × 32 lattice at β = 6.2. A comparison is made for a variety of smeared nucleon sources and preliminary results for the calculation of the nucleon tensor charge are presented.
متن کامل