Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin Symmetry

Details Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin Symmetry Two-photon width of eta_b, eta'_b and eta''_b from Heavy-Quark Spin Symmetry

2006-09-26

arxiv.org/abs/hep-ph/0609268v2

Phys.Rev.D75:017501,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

3 pages, Revtex4; v2: 2 references added

Scientific paper

10.1103/PhysRevD.75.017501

We predict the two-photon width of the pseudoscalar bottomonia, Gamma(eta_b -> gamma gamma), Gamma(eta'_b -> gamma gamma) and Gamma(eta''_b -> gamma gamma) within a Heavy-Quark Spin-Symmetry setting following the same line as our recent work for the corresponding decays for charmonia. Binding-energy effects are included for excited states and are shown to shift up the eta'_b and eta''_b widths by 10 %. We point out that the essentially model independent ratio Gamma(eta_b -> gamma gamma)/Gamma(Upsilon -> ll) and the branching ratio BR(eta_b -> gamma gamma) obtained could be used to extract the coupling constant alpha_s.

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