Radiative Decay of Vector Quarkonium: Constraints on Glueballs and Light Gluinos

Abstract

Given a resonance of known mass, width, and J^{PC}, we can determine its gluonic branching fraction, b(R->gg), from data on its production in radiative vector quarkonium decay, V -> gamma+R. For most resonances b(R->gg) is found to be O(10%), consistent with being q-qbar states, but we find that both pseudoscalars observed in the 1440 MeV region have b(R->gg) ~ 1/2 - 1, and b(f_0^{++}->gg) ~ 1/2. As data improves, b(R->gg) should be a useful discriminator between q-qbar and gluonic states and may permit quantitative determination of the extent to which a particular resonance is a mixture of glueball and q-qbar. We also examine the regime of validity of pQCD for predicting the rate of V -> gamma+eta_gluino, the ``extra'' pseudoscalar bound state which would exist if there were light gluinos. From the CUSB limit on peaks in Upsilon -> gamma X, the mass range 3 GeV < m(eta_gluino) < 7 GeV can be excluded. An experiment must be significantly more sensitive to exclude an eta_gluino lighter than this.

36pp (inc figs),RU-94-04. (Replaces original which didn't latex correctly and didn't have figures.)

Cited by in corpus (31)

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• Dynamical generation of pseudoscalar resonances
• Partial wave analysis of $J/\psi \to \gamma \eta {\eta }^{\prime }$
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• Observation of a state $X(2600)$ in the ${\pi }^{+}{\pi }^{-}{\eta }^{\prime }$ system in the process $J/\psi \to \gamma {\pi }^{+}{\pi }^{-}{\eta }^{\prime }$
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• Closing the Light Gluino Window in Supersymmetric Grand Unified Models
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• Constraints on Light Gluinos from Tevatron Dijet Data
• Factorization for radiative heavy quarkonium decays into scalar Glueball
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• Search for the $X(2370)$ and observation of ${\eta }_c\to \eta \eta {\eta }^{\prime }$ in $J/\psi \to \gamma \eta \eta {\eta }^{\prime }$
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