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

Abstract

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.

3 pages, Revtex4; v2: 2 references added

References in corpus (3)

• J/psi, psi' and Upsilon Production at Hadron Colliders: a review
• Dynamic Properties of Charmonium
• Two-photon width of eta_c and eta'_c from Heavy-Quark Spin Symmetry

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• $O({\alpha }_s{v}^2)$ Corrections to Hadronic and Electromagnetic Decays of ${}^1{S}_0$ Heavy Quarkonium
• Curing the unphysical behaviour of NLO quarkonium production at the LHC and its relevance to constrain the gluon PDF at low scales
• η_b and η_c radiative decays in the Salpeter model with the AdS/QCD inspired potential
• Radiative and leptonic decays of the pseudoscalar charmonium state ${\eta }_c$
• Two-photon decay of pseudoscalar quarkonia
• Study of meson properties in quark models (Ph.D. Thesis, University of Pittsburgh, October 2006)