%0 Journal Article %1 Lansberg2006Twophoton %A Lansberg, J. P. %A Pham, T. N. %D 2006 %J Physical Review D %K heavy, phrno %N 1 %R 10.1103/physrevd.75.017501 %T Two-photon width of eta\_b, eta'\_b and eta''\_b from Heavy-Quark Spin Symmetry %U http://dx.doi.org/10.1103/physrevd.75.017501 %V 75 %X 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.

@article{Lansberg2006Twophoton, 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.}}, added-at = {2019-02-23T22:09:48.000+0100}, archiveprefix = {arXiv}, author = {Lansberg, J. P. and Pham, T. N.}, biburl = {https://www.bibsonomy.org/bibtex/26bf0c1f151a513b98e90bb64081af9cb/cmcneile}, citeulike-article-id = {5626871}, citeulike-linkout-0 = {http://arxiv.org/abs/hep-ph/0609268}, citeulike-linkout-1 = {http://arxiv.org/pdf/hep-ph/0609268}, citeulike-linkout-2 = {http://dx.doi.org/10.1103/physrevd.75.017501}, comment = {Input of decay constants to calculations.}, day = 3, doi = {10.1103/physrevd.75.017501}, eprint = {hep-ph/0609268}, interhash = {cc68e54892b91c5926dda3d49e2efc79}, intrahash = {6bf0c1f151a513b98e90bb64081af9cb}, issn = {1550-7998}, journal = {Physical Review D}, keywords = {heavy, phrno}, month = oct, number = 1, posted-at = {2009-08-23 10:48:29}, priority = {3}, timestamp = {2019-02-23T22:15:27.000+0100}, title = {{Two-photon width of eta\_b, eta'\_b and eta''\_b from Heavy-Quark Spin Symmetry}}, url = {http://dx.doi.org/10.1103/physrevd.75.017501}, volume = 75, year = 2006 }