/ hep-ex arXiv:1602.01523

Observation of pseudoscalar and tensor resonances in $J/\psi\rightarrow \gamma \phi \phi$

Pages: 7

Abstract: Based on a sample of $(1310.6 \pm 10.5) \times 10^{6}$ $J/\psi$ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay $J/\psi\rightarrow \gamma \phi \phi$ is performed in order to study the intermediate states. Results of the partial wave analysis show that the structures are predominantly $0^{-+}$ states. The existence of the $\eta(2225)$ is confirmed, and its resonance parameters are measured. Two additional pseudoscalar states, the $\eta(2100)$ with a mass of $2050_{-24}^{+30}{}_{-26}^{+75}$ MeV/$c^{2}$ and a width of $250_{-30}^{+36}{}_{-164}^{+181}$ MeV/$c^{2}$ and the $X(2500)$ with a mass of $2470_{-19}^{+15}{}_{-23}^{+101}$ MeV/$c^{2}$ and a width of $230_{-35}^{+64}{}_{-33}^{+56}$ MeV/$c^{2}$, are observed. In addition to these three pseudoscalar states, the scalar state $f_0(2100)$, and three tensor states, the $f_2(2010)$, $f_2(2300)$ and $f_2(2340)$, are observed in the process $J/\psi\rightarrow \gamma \phi\phi$. The product branching fractions $\cal B$($J/\psi\rightarrow \gamma X\rightarrow \gamma \phi \phi$) are reported.

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