Effective weak Hamiltonian for theΔb=1nonleptonic decays in the six-quark model

Quantum-chromodynamic corrections and flavor-symmetry-breaking effects are considered in the leading-logarithmic approximation for the calculation of the $\Delta b=1\mathrm{}$ nonleptonic effective weak Hamiltonian in the context of the Kobayashi-Maskawa model. It is found that flavor-symmetry breaking is very important for the cases under consideration here.