302 research outputs found
QCD sum rules for quark-gluon three-body components in the B meson
We discuss the QCD sum rule calculation of the heavy-quark effective theory
parameters, and , which correspond to matrix elements
representing quark-gluon three-body components in the -meson wavefunction.
We derive the sum rules for calculating the new higher-order
QCD corrections, i.e., the order radiative corrections to the Wilson
coefficients associated with the dimension-5 quark-gluon mixed condensates, and
the power corrections due to the dimension-6 vacuum condensates. We find that
the new radiative corrections significantly improve the stability of the
corresponding Borel sum rules and lead to the reduction of the values of
. We also discuss the renormalization-group improvement for the
sum rules and present update on the values of .Comment: 28 pages, 20 figures, version to appear in Nuclear Physics
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