Analyzing Bs - bar Bs mixing: Non-perturbative contributions to bag parameters from sum rules
Abstract
We use QCD sum rules to compute matrix elements of the Delta B=2 operators appearing in the heavy-quark expansion of the width difference of the Bs mass eigenstates. Our analysis includes the leading-order operators Q and QS, as well as the subleading operators R2 and R3, which appear at next-to-leading order in the 1/mb expansion. We conclude that the violation of the factorization approximation for these matrix elements due to non-perturbative vacuum condensates is as low as 1-2%.
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