Study of J/psi->eta phi pi+pi- at BESIII

Abstract

Based on a sample of $2.25\times 10^{8}J/\psi$ events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay $J/\psi \to \eta \varphi {\pi }^{+}{\pi }^{-}$. The $Y(2175)$ resonance is observed in the invariant mass spectrum of $\varphi f_0(980)$ with a statistical significance of greater than $10\sigma$. The corresponding mass and width are determined to be $M=2200\pm 6(stat.)\pm 5(syst.)\mathrm{MeV}/c^2$ and $\Gamma =104\pm 15(stat.)\pm 15(syst.)$ MeV, respectively, and the product branching fraction is measured to be $\mathcal{B}(J/\psi \to \eta Y(2175)$, $Y(2175)\to \varphi f_0(980)$, $f_0(980)\to {\pi }^{+}{\pi }^{-})=(1.20\pm 0.14(stat.)\pm 0.37(syst.))\times 10^{-4}$. The results are consistent within errors with those of previous experiments. We also measure the branching fraction of $J/\psi \to \varphi f_1(1285)$ with $f_1(1285)\to \eta {\pi }^{+}{\pi }^{-}$ and set upper limits on the branching fractions for $J/\psi \to \varphi \eta (1405)$/$\varphi X(1835)$/$\varphi X(1870)$ with $\eta (1405)$/$X(1835)$/$X(1870)\to \eta {\pi }^{+}{\pi }^{-}$ at the 90\% confidence level.

arXiv comment11 pages, 11 figures

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• Reinterpreting several narrow `resonances' as threshold cusps
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• Study of resonant structure around 1.8 GeV/$c^2$ and $\eta (1405)$ in $J/\psi \to \omega \eta {\pi }^{+}{\pi }^{-}$
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• Measurement of $e^{+}{e}^{-}\to K^{+}{K}^{-}$ cross section at $\sqrt{s}=2.00-3.08$ GeV
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• Observation of a resonant structure in $e^{+}{e}^{-}\to \omega \eta$ and another in $e^{+}{e}^{-}\to \omega {\pi }^0$ at center-of-mass energies between 2.00 and 3.08 GeV
• The electromagnetic form factors of $\Lambda$ hyperon in the vector meson dominance model
• Observation of a structure in $e^{+}{e}^{-}\to \varphi {\eta }^{\prime }$ at $\sqrt{s}$ from 2.05 to 3.08 GeV
• A possible partner state of the $Y(2175)$
• Fully-strange tetraquark $ss\bar{s}\bar{s}$ spectrum and possible experimental evidence
• Mass spectrum and strong decays of strangeonium in a constituent quark model
• $S$- and $P$-wave fully-strange tetraquark states from QCD sum rules
• Cross section measurements of $e^{+}{e}^{-}\to K^{+}{K}^{-}{K}^{+}{K}^{-}$ and $\varphi K^{+}{K}^{-}$ at center-of-mass energies from 2.10 to 3.08 GeV
• Study on the strong decays of $\varphi (2170)$ and a grand expectation for the future charm-tau factory
• The $ss\bar{s}\bar{s}$ tetraquark states and the newly observed structure $X(2239)$ by BESIII Collaboration
• Nature of the vector resonance $Y(2175)$
• Is the $Y(2175)$ a Strangeonium Hybrid Meson?
• Partial wave analysis of $\psi (3686)\to K^{+}{K}^{-}\eta$
• QCD sum rule studies on the $ss\bar{s}\bar{s}$ tetraquark states with $J^{PC}=1^{+-}$
• Study of the process $e^{+}{e}^{-}\to \varphi \eta$ at center-of-mass energies between 2.00 and 3.08 GeV
• Observation and study of the decay $J/\psi \to \varphi \eta {\eta }^{\prime }$
• Light unflavor vector meson spectroscopy around the mass range of $2.4\sim 3$ GeV and possible experimental evidence
• Observation of the isospin-violating decay $J/\psi \to \varphi {\pi }^0{f}_0(980)$
• Resonances in $e^{+}{e}^{-}$ annihilation near 2.2 GeV
• Study of the $\omega$ meson family and newly observed $\omega$-like state $X(2240)$
• The $\varphi (2170)$ production in the process $\gamma p\to \eta \varphi p$
• Cross section measurement of $e^{+}{e}^{-}\to K_S^0{K}_L^0$ at $\sqrt{s}=2.00-3.08\mathrm{GeV}$
• Studying $X(2100)$ hadronic decays and predicting its pion and kaon induced productions
• Deciphering the light vector meson contribution to the cross sections of $e^{+}{e}^{-}$ annihilations into the open-strange channels through a combined analysis
• Light axial-vector and vector resonances $X(2100)$ and $X(2239)$
• Fully strange tetraquark resonant states as the cousins of $X(6900)$
• Physics Accomplishments and Future Prospects of the BES Experiments at the BEPC Collider
• Measurement of the integrated luminosity and the center-of-mass energy of the data taken by BESIII at $\sqrt{s}=2.125$ GeV
• $J/\psi \to \gamma {\eta }^{\prime }{\pi }^{+}{\pi }^{-}$ and the structure observed around the $\bar{p}p$ threshold
• Reconciling the X(2240) with the Y(2175)
• Strange Quarkonium States at BESIII
• Higher strangeonium decays into light flavor baryon pairs like $\Lambda \bar{\Lambda }$, $\Sigma \bar{\Sigma }$, and $\Xi \bar{\Xi }$
• Study of the isospin breaking decay $\mathbf{Y}(2175)\to \mathbf{\varphi }{\mathbf{f}}_0(980)\to \mathbf{\varphi \eta }{\mathbf{\pi }}^0$ at BESIII
• The ground states and the first radially excited states of D-wave vector $\rho$ and $\varphi$ mesons
• Role of the $f_1(1285)$ state in the $J/\psi \to \varphi \bar{K}{K}^{\ast }$ and $J/\psi \to \varphi f_1(1285)$ decays
• Investigate the pentaquark resonance in the $NK$ system
• Study of $a_0^0(980)$-$f_0(980)$ mixing from $a_0(1450)\to a_0^0(980)f_0(500)\to {\pi }^{+}{\pi }^{-}{f}_0(500)$
• Light tetraquark states with exotic quantum numbers $J^{PC}=2^{+-}$
• Measurement of Branching Fractions of $\psi (3686)\to \varphi {\eta }^{\prime },\varphi f_1(1285)$ and $\varphi \eta (1405)$
• Search for the $Y(2175)$ in the photoproduction cross section measurement of $\gamma p\to \varphi {\pi }^{+}{\pi }^{-}p$ at GlueX