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We calculate the contributions arising at order $\alpha_s$ in the QCD sumrule for the spin-symmetry violating universal function $\chi_3(v\cdot v')$,which appears at order $1/m_Q$ in the heavy quark expansion of meson formfactors. In particular, we derive the two-loop perturbative contribution to thesum rule. Over the kinematic range accessible in $B\to D^{(*)}\ell\,\nu$decays, we find that $\chi_3(v\cdot v')$ does not exceed the level of $\sim1\%$, indicating that power corrections induced by the chromo-magnetic operatorin the heavy quark expansion are small.Comment: 12 pages ReVTeX, 3 figures available upon request, SLAC-PUB-6017,  WIS-92/99/Dec-P

physical review. d. particles, fields, gravitation, and cosmology/physical review. d. particles and fields

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Subleading Isgur-Wise form factorχ3(v·v′)to order