Large mass expansion in two-loop QCD corrections of para-charmonium decay

Details Large mass expansion in two-loop QCD corrections of para-charmonium decay Large mass expansion in two-loop QCD corrections of para-charmonium decay

2006-10-30

arxiv.org/abs/hep-ph/0610415v3

Phys.Rev.D77:017503,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

24 pages, 10 figures; REVTeX version; Version to appear in Phys. Rev. D, 9 pages, 4 figures

Scientific paper

10.1103/PhysRevD.77.017503

We calculate the two-loop QCD corrections to paracharmonium decays $eta_{c} rightarrow gamma gamma$ and $eta_{c} rightarrow g g$ involving light-by-light scattering diagrams with light quark loops. Artificial large mass expansion and convergence improvement techniques are used to evaluate these corrections. The obtained corrections to the decays $eta_{c} rightarrow gamma gamma$ and $eta_{c} rightarrow g g$ account for $-1.25 %$ and $ -0.73 %$ of the leading order contribution, respectively.

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