Observation of the isospin-violating decay $J/\psi \to \varphi {\pi }^0{f}_0(980)$

Abstract

Using a sample of 1.31 billion $J/\psi$ events collected with the BESIII detector at the BEPCII collider, the decays $J/\psi \to \varphi {\pi }^{+}{\pi }^{-}{\pi }^0$ and $J/\psi \to \varphi {\pi }^0{\pi }^0{\pi }^0$ are investigated. The isospin violating decay $J/\psi \to \varphi {\pi }^0{f}_0(980)$ with $f_0(980)\to \pi \pi$, is observed for the first time. The width of the $f_0(980)$ obtained from the dipion mass spectrum is found to be much smaller than the world average value. In the ${\pi }^0{f}_0(980)$ mass spectrum, there is evidence of $f_1(1285)$ production. By studying the decay $J/\psi \to \varphi {\eta }^{\prime }$, the branching fractions of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and ${\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0$, as well as their ratio, are also measured.

10 pages, 10 figures, published in Phys. Rev. D

References in corpus (2)

• $f_1(1285)$ decays into $a_0(980){\pi }^0$, $f_0(980){\pi }^0$ and isospin breaking
• Study of J/psi->eta phi pi+pi- at BESIII

Cited by in corpus (13)

• Revising the $f_1(1420)$ resonance
• Newly observed $a_0(1817)$ as the scaling point of constructing the scalar meson spectroscopy
• The $K\bar{K}\pi$ decay of the $f_1(1285)$ and its nature as a $K^{\ast }\bar{K}-cc$ molecule
• Mechanisms of the isospin-breaking decay $f_1(1285)\to f_0(980){\pi }^0\to {\pi }^{+}{\pi }^{-}{\pi }^0$
• Interference phenomena in the decay $D_s^{+}\to \eta {\pi }^0{\pi }^{+}$ induced by the $a_0^0(980)-f_0(980)$ mixing
• Strong isospin symmetry breaking in light scalar meson production
• Radiative decays of $f_1(1285)$ as the $K^{\ast }\bar{K}$ molecular state
• Theoretical description of the $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1380)$, $\mathbf{J}/\mathbf{\psi }\to \mathbf{\eta }({\mathbf{\eta }}^{\prime }){\mathbf{h}}_1(1170)$ and $\mathbf{J}/\mathbf{\psi }\to {\mathbf{\pi }}^0{\mathbf{b}}_1(1235{)}^0$ reactions
• Patterns of $C$- and $CP$-violation in hadronic $\eta$ and ${\eta }^{\prime }$ three-body decays
• 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
• Proposal to look for the anomalous isotopic symmetry breaking in central diffractive production of the $f_1(1285)$ and $a_0^0(980)$ resonances at the LHC
• Studies of Charmonium at BESIII
• Observation of $\psi (3686)\to \gamma \eta (1405)$ via $\eta (1405)\to f_0(980){\pi }^0$