Abstract
We present a QCD sum-rule determination of the heavy-quark energy inside a heavy meson, − λ 1/2 m Q , which is consistent with the field-theory analog of the virial theorem. We obtaine − λ 1 ≈ (0.10 ± 0.05) GeV 2, significantly smaller than a previous sum-rule result, but in good agreement with recent determinations from the analysis of inclusive decays. We also present a new determination of the chromo-magnetic interaction, yielding λ 2( m b ) = (0.15 ± 0.03) GeV 2. This implies m 2 B ∗ − m 2 B = (0.60 ± 012) GeV 2 , in good agreement with experiment. As a by-product of our analysis, we derive the QCD sum rules for the three form factors describing the meson matrix element of a velocity-changing current operator containing the gluon field-strength tensor.
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