QSSR estimate of the BB parameter at next-to-leading order
S. Narison, A. A. Pivovarov
Abstract
We compute the leading αs corrections to the two-point correlator of the OΔB=2 operator which controls the B0 B0 mixing. Using this result within the QCD spectral sum rules approach and some phenomenologically reasonable assumptions in the parametrization of the spectral function, we conclude that the vacuum saturation values BB BB* 1 are satisfied within 15\%.
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