Comment on the Renormalization Group Improvement in Exclusive $b\ra c $ Transitions

Details Comment on the Renormalization Group Improvement in Exclusive $b\ra c $ Transitions Comment on the Renormalization Group Improvement in Exclusive $b\ra c $ Transitions

1994-09-22

arxiv.org/abs/hep-ph/9409382v1

Mod.Phys.Lett.A10:1803-1812,1995

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages Revised: PS file for Fig.1 corrupted my mailer is replaced by the uuencoded one. Plain LaTeX

Scientific paper

10.1142/S0217732395001939

Using rather general consideration I argue that the numerical impact of the existing next-to-leading logarithmic summations of terms $\log{m_b/m_c}$ for perturbative factors $\eta_A$, $\eta_V$ in the exclusive zero recoil semileptonic transitions is irrelevant, and adopting corresponding corrections beyond the exact one loop result for both estimating the values of these formfactors and their theoretical uncertainty, is misleading. The central theoretical value if taken literally is then $\eta_A\simeq 0.97$.

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