QSSR estimate of the $B_B$ parameter at next-to-leading order

Details QSSR estimate of the $B_B$ parameter at next-to-leading order QSSR estimate of the $B_B$ parameter at next-to-leading order

1994-03-04

arxiv.org/abs/hep-ph/9403225v1

Phys.Lett.B327:341-346,1994

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, LaTeX, CERN-TH.7140/94, PM 93/16, and KEK Preprint 93-184, two figures appended as a PS file

Scientific paper

10.1016/0370-2693(94)90739-0

We compute the leading $\alpha_s$ corrections to the two-point correlator of the $O_{\Delta B=2}$ operator which controls the $B^0 \bar B^0$ 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 $B_B\simeq B_{B^*}\simeq 1$ are satisfied within 15\%.

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