\ga\ga and g g decay rates for equal mass heavy quarkonia

Details \ga\ga and g g decay rates for equal mass heavy quarkonia \ga\ga and g g decay rates for equal mass heavy quarkonia

2009-01-25

arxiv.org/abs/0901.3917v4

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, QCD corrections added, Tables modified

Scientific paper

We present a calculation of the two-photon and two-gluon widths for the equal mass quarkonium states $^1S_0$, $^3P_0$ and $^3P_2$ of the charmonium and upsilon systems. The approach taken is based on using the full relativistic $q\bar{q}\to\ga\ga$ amplitude together with a wave function derived from the instantaneous Bethe-Salpeter equation. Momentum space radial wave functions obtained from an earlier fit of the charmonium and upsilon spectra are used to evaluate the necessary integrals.

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