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- W2009981036 abstract "We calculate the $eta^prime$-meson energy spectrum in the $Upsilon (1S) to eta^prime g g g to eta^prime X$ decay in the leading-order perturbative QCD in the static-quark limit for the orthoquarkonium.Our principal result is the extraction of parameters of the $eta^prime g^* g$ effective vertex function (EVF) involving a virtual and a real gluon from the available data on the hard part of the $eta^prime$-meson energy spectrum. The perturbative-QCD based framework provides a good description of the available CLEO data, allowing one to constrain the lowest Gegenbauer coefficients $B^{(q)}_2$ and $B^{(g)}_2$ of the quark-antiquark and gluonic distribution amplitudes of the $eta^prime$-meson. The resulting constraints are combined with the existing ones on these coefficients from an analysis of the $eta^prime - gamma$ transition form factor and the requirement of positivity of the EVF, yielding $B^{(q)}_2 (mu_0^2) = -0.008 pm 0.054$ and $B^{(g)}_2 (mu_0^2) = 4.6 pm 2.5$ for $mu_0^2 = 2 GeV^2$. This reduces significantly the current uncertainty on these coefficients." @default.
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- W2009981036 date "2003-11-07" @default.
- W2009981036 modified "2023-10-18" @default.
- W2009981036 title "The η′ g* g(*) vertex including the η′-meson mass" @default.
- W2009981036 doi "https://doi.org/10.1140/epjcd/s2003-03-509-2" @default.
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