Leading logarithmic QCD corrections to the B_s --> γγdecay rate including long-distance effects through B_s --> φγ--> γ γ

Details Leading logarithmic QCD corrections to the B_s --> γγdecay rate including long-distance effects through B_s --> φγ--> γ γ Leading logarithmic QCD corrections to the B_s --> γγdecay rate including long-distance effects through B_s --> φγ--> γ γ

1997-04-23

arxiv.org/abs/hep-ph/9704385v4

Phys.Lett. B409 (1997) 425-434

Physics

High Energy Physics

High Energy Physics - Phenomenology

15 pages, 6 figures (require epsf.sty). last change in page number in reference list, accepted for publication in Phys. Lett B

Scientific paper

10.1016/S0370-2693(97)00861-7

We present leading logarithmic QCD corrections to the decay B_s --> \gamma\gamma in the Standard Model. Further, the form factor F_{1}(0) of B_s --> \phi\gamma is calculated in the framework of QCD sum rules and found to be in agreement with the result existing in the literature. Using Vector Meson Dominance model, the amplitude for B_s --> \phi \gamma -->\gamma\gamma is calculated as an estimate of the O_7-type contributions to the long-distance effects in the B_s --> \gamma\gamma decay. The resulting branching ratio B(B_s --> \gamma \gamma)_{SD+LD_{O_7}} is analysed in view of its strong dependence on the non-perturbative parameter $\bar{\Lambda}_s$, describing bound state effects, and the renormalization scale $\mu$. .

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