Inclusive electromagnetic decays of the heavy quarkonium at next to leading log accuracy

Details Inclusive electromagnetic decays of the heavy quarkonium at next to leading log accuracy Inclusive electromagnetic decays of the heavy quarkonium at next to leading log accuracy

2004-04-26

arxiv.org/abs/hep-ph/0404225v1

Acta Phys.Polon. B34 (2003) 5295-5304

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 6 figures, Invited talk at the XXVII International Conference of Theoretical Physics, Ustron, Poland, 15-21 Septembe

Scientific paper

We show that perturbation theory may give reasonable numbers for the decays
of the bottomonium and charmonium ground states to $e^+e^-$ and to
$\gamma\gamma$. To reach this conclusion it is important to perform the
resummation of logs. In particular, we obtain the value $\Gamma(\eta_b (1S) \to
\gamma\gamma)=0.35 \pm 0.1 ({\rm th.}) \pm 0.05 (\lQ)$ KeV.

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