T. Mannel, B. D. Pecjak, A. A. Pivovarov
Published 2007-03-22Version 1
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 B_s mass eigenstates. Our analysis includes the leading-order operators Q and Q_S, as well as the subleading operators R_2 and R_3, which appear at next-to-leading order in the 1/m_b 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%.
Comments: 31 pages, 5 figures
Matrix Elements of Four-quark Operators Relevant to Lifetime Difference ΔΓ_{B_s} from QCD Sum Rules
Role of Four-Quark Operators in the Inclusive $Λ_b$ Decays
Chiral Condensates, Q_7 and Q_8 Matrix Elements and Large-N_c QCD
