1
From a partial wave analysis of the systems (${{\mathit \gamma}}{{\mathit X}}$), with ${{\mathit X}}$ $\rightarrow$ ${{\mathit \eta}^{\,'}}{{\mathit \eta}^{\,'}}$, and (${{\mathit \eta}^{\,'}}{{\mathit X}}$), with ${{\mathit X}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}$ in the decay ${{\mathit J / \psi}}$ $\rightarrow$ ${{\mathit \gamma}}{{\mathit \eta}^{\,'}}{{\mathit \eta}^{\,'}}$. The intermediate resonance ${{\mathit X}}$ is parametrized by a constant-width, relativistic Breit-Wigner.
2
From partial wave analysis including all possible combinations of 0${}^{++}$, 2${}^{++}$, and 4${}^{++}$ resonances.
Light Quark Resonances in ${{\overline{\mathit p}}}{{\mathit p}}$ Annihilations at 5.2 GeV/$\mathit c$
LONGACRE
2004
PR D70 094041
Evidence for a Fourth State Related to the three $\mathit J{}^{PC} = 2{}^{++}$, ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \phi}}{{\mathit n}}$ States Explainable by 2${}^{++}$ Gluebal Production
ETKIN
1988
PL B201 568
Increased Statistics and Observation of $\mathit g_{{{\mathit T}}}$, $\mathit g_{{{\mathit T}^{\,'}}}$ and $\mathit g_{{{\mathit T}^{"}}}$ $2+{}^{+}{}^{}$ Resonances in Glueball Enhanced Channel ${{\mathit \pi}^{-}}$ ${{\mathit p}}$ $\rightarrow$ ${{\mathit \phi}}{{\mathit \phi}}{{\mathit n}}$
BOOTH
1986
NP B273 677
A High Statistics Study of the ${{\mathit \phi}}{{\mathit \phi}}$ Mass Spectrum
