QCD Sum Rule Analysis of the Subleading Isgur-Wise Form Factor $χ_2(v\cdot v')$

Details QCD Sum Rule Analysis of the Subleading Isgur-Wise Form Factor $χ_2(v\cdot v')$ QCD Sum Rule Analysis of the Subleading Isgur-Wise Form Factor $χ_2(v\cdot v')$

1992-09-23

arxiv.org/abs/hep-ph/9209271v1

Phys.Lett.B301:101-107,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

(10 pages, REVTEX, 2 figures not included) SLAC-PUB-5915, WIS-92/70/Sep-PH

Scientific paper

10.1016/0370-2693(93)90728-Z

We present a QCD sum rule calculation of the spin-symmetry violating universal function $\chi_2(v\cdot v')$, which appears at order $1/m_Q$ in the heavy quark expansion of meson form factors. This function vanishes in the standard approximation, where radiative effects are neglected. For the first time, the complete set of diagrams arising at order $\alpha_s$ is evaluated. In particular, we find $\chi_2(1) = -(3.8\pm 0.4)\%$ at zero recoil, indicating that $1/m_Q$ corrections induced by the chromo-magnetic moment operator are small.

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