| Abstract: | Based on a sample of $2.25 imes 10^{8} J/psi$ events taken with the BESIII
detector at the BEPCII collider, we present the results of a study of the decay
$J/psi o eta phipi^{+}pi^{-}$. The $Y(2175)$ resonance is observed in the
invariant mass spectrum of $phi f_{0}(980)$ with a statistical significance of
greater than $10sigma$. The corresponding mass and width are determined to be
$M=2200pm 6 mathrm{(stat.)} pm 5mathrm{(syst.)} mathrm{MeV}/c^{2}$ and
$Gamma=104pm 15mathrm{(stat.)}pm 15mathrm{(syst.)}$ MeV, respectively, and
the product branching fraction is measured to be $mathcal{B}(J/psi oeta
Y(2175)$, $Y(2175) o phi f_{0}(980)$, $f_{0}(980) o pi^{+}pi^{-})=
(1.20pm 0.14mathrm{(stat.)}pm 0.37 mathrm{(syst.)}) imes 10^{-4}$. The
results are consistent within errors with those of previous experiments. We
also measure the branching fraction of $J/psi o phi f_1(1285)$ with
$f_1(1285) o etapi^{+}pi^{-}$ and set upper limits on the branching
fractions for $J/psi o phieta(1405)$/$phi X(1835)$/$phi X(1870)$ with
$eta(1405)$/$X(1835)$/$X(1870) o etapi^{+}pi^{-}$ at the 90\% confidence
level. |
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