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 Statistics , 2010, DOI: 10.1140/epjc/s10052-010-1511-3 Abstract: There is a large discrepancy between results of Crystal Barrel and WA102 for the branching ratio R = BR[eta2(1870)->a2(1320)pi]/ BR[eta2(1870)->f2(1270)eta]. An extensive re-analysis of the Crystal Barrel data redetermines branching ratios for decays of eta2(1870), eta2(1645), eta2(2030) and f2(1910). This re-analysis confirms a small value for R of 1.60+-0.39, inconsistent with the value 32.6+-12.6 of WA102. The likely origin of the discrepancy is that the WA102 data contain a strong f2(1910)->a2-pi signal as well as eta2(1870). There is strong evidence that the eta2(1870) has resonant phase variation. A peak in f2(1270)a0(980) confirms closely the parameters of the a2(2255) resonance observed previously. A peak in eta2(2030)-pi is interpreted naturally in terms of pi2(2245) with reduced errors for mass and width M=2285+-20(stat)+-25(syst) MeV, Gamma=250+-20(stat)+-25(syst) MeV.
 High Energy Physics - Phenomenology , 2013, Abstract: An isoscalar resonance, X(1870), with a mass $M=1877.3\pm6.3(stat)^{+3.4}_{-7.4}(syst)$MeV and width $\Gamma=57\pm12(stat)^{+19}_{-4}(syst)$MeV was observed by the BesIII Collaboration recently. The mass of X(1870) is compatible with $\eta_2(1870)$ but the decay width is much smaller. In this paper, we analyzed the mass and the two-body strong decay of $\eta_2(1870)$ and X(1870). According to the mass spectra predicted by the Godfrey-Isgur potential model, X(1870) can be candidates of the states $f'_1(2^3P_1)$, $\eta'_2(1^1D_2)$ or $\eta_2(2^1D_2)$. In the Regge trajectories (RTs) framework, X(1870) favors the $\eta'(3^1S_0)$ and $f'_1(2^3P_1)$ assignments. However, the decay properties of $\eta'(3^1S_0)$, $f'_1(2^3P_1)$, $\eta'_2(1^1D_2)$ disagree with the experiments. The two-body strong decay widths indicate that $\eta_2(1870)$ and X(1870) maybe the two different resonant structures. $\eta_2(1870)$ could be assigned to the $\eta_2(2^1D_2)$ quarkonium as the first radical excited state of $\eta_2(1645)$. X(1870) favors a $\eta_H(0^+2^{-+})$ hybrid assignment. Some significant decay modes are suggested to test in future.