Bound-state effects in μ^+ e^- \to γγand \bar{B}^{0}_s \to γγdecays

Details Bound-state effects in μ^+ e^- \to γγand \bar{B}^{0}_s \to γγdecays Bound-state effects in μ^+ e^- \to γγand \bar{B}^{0}_s \to γγdecays

2000-07-17

arxiv.org/abs/hep-ph/0007183v1

Eur.Phys.J.C17:163-168,2000

Physics

High Energy Physics

High Energy Physics - Phenomenology

6 pages, 3 figures, to appear in Eur. Phys. J. C

Scientific paper

10.1007/s100520000471

We demonstrate that in the double-radiative decays of heavy-light QED and QCD atoms, \mu^{+} e^{-} \to \gamma\gamma and \bar{B}^{0}_{s} \to \gamma\gamma, there is a contribution coming from operators that vanish on the free-quark mass shell. This off-shell effect is suppressed with respect to the effect of the well known flavour-changing magnetic-moment operator by the bound-state binding factor. Accordingly, the negligible off-shellness of the weakly bound QED atoms becomes important for strongly bound QCD atoms. We present this effect in two different model-approaches to QCD, one of them enabling us to keep close contact to the related effect in QED.

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