Non-factorizable effects in B-anti-B mixing
Abstract
We study the B-parameter (``bag factor'') for B-anti-B mixing within a recently developed heavy-light chiral quark model. Non-factorizable contributions in terms of gluon condensates and chiral corrections are calculated. In addition, we also consider 1/mQ corrections within heavy quark effective field theory. Perturbative QCD effects below μ = mb known from other work are also included. Considering two sets of input parameters, we find that the renormalization invariant B-parameter is B = 1.51 +- 0.09 for Bd and B = 1.40 +- 0.16 for Bs.
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