Search for hadronic transition ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ and observation of ${\chi }_{cJ}\to K\bar{K}\pi \pi \pi$

Abstract

Hadronic transitions of ${\chi }_{cJ}\to {\eta }_c{\pi }^{+}{\pi }^{-}$ (J=0, 1, 2) are searched for using a sample of $1.06\times 10^8$ $\psi (3686)$ events collected with the BESIII detector at the BEPCII storage ring. The $\etac$ is reconstructed with $K_S^0{K}^{+}{\pi }^{-}+c.c.$ and $K^{+}{K}^{-}{\pi }^0$ final states. No signals are observed in any of the three ${\chi }_{cJ}$ states in either $\etac$ decay mode. At the 90% confidence level, the upper limits are determined to be $\BR(χ_{c0}\to η_{c}π^{+}π^{-})<0.07%$, $\BR(χ_{c1}\to η_{c}π^{+}π^{-})<0.32%$, and $\BR(χ_{c2}\to η_{c}π^{+}π^{-})<0.54%$. The upper limit of $\BR(χ_{c1}\to η_{c}π^{+}π^{-}$ is lower than the existing theoretical prediction by almost an order of magnitude. The branching fractions of ${\chi }_{cJ}\to K_S^0{K}^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}+c.c.$, $K^{+}{K}^{-}{\pi }^{+}{\pi }^{-}{\pi }^0$, $\omega K^{+}{K}^{-}$ and $\varphi {\pi }^{+}{\pi }^{-}{\pi }^0$ (J=0, 1, 2) are measured for the first time.

References in corpus (6)

• Heavy quarkonium: progress, puzzles, and opportunities
• Study of ${\chi }_{cJ}$ radiative decays into a vector meson
• Evidence for psi' decays into gamma pi^0 and gamma eta
• Observation of ${\chi }_{c1}$ decays into vector meson pairs $\varphi \varphi$, $\omega \omega$, and $\omega \varphi$
• Search for resonances decaying to eta_c pi+ pi- in two-photon interactions
• Hadronic Transition chi(c1)(1P) to eta(c) plus two pions at the Beijing Spectrometer BES and the Cornell CLEO-c

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• Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV
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• Study of open-charm decays and radiative transitions of the X(3872)
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• Precision Study of ${\eta }^{\prime }\to \gamma {\pi }^{+}{\pi }^{-}$ Decay Dynamics
• 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
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• Observation of a structure in $e^{+}{e}^{-}\to \varphi {\eta }^{\prime }$ at $\sqrt{s}$ from 2.05 to 3.08 GeV
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• Measurement of the absolute branching fraction of $D_{s0}^{\ast \pm }(2317)\to {\pi }^0{D}_s^{\pm }$
• 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
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• Observation of Electromagnetic Dalitz decays J/ψ\to P e^+e^-
• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
• Observation of $h_1(1380)$ in the $J/\psi \to {\eta }^{\prime }K\bar{K}\pi$ Decay
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• Evidence for η_{c}(2S) in ψ(3686) \to γK_{S}^{0}K^{\pm}π^{\mp}π^{+}π^{-}
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• Cross section measurements of $e^{+}{e}^{-}\to p\bar{p}{\pi }^0$ at center-of-mass energies between 4.008 and 4.600 GeV
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• Study of $\eta (1475)$ and $X(1835)$ in radiative $J/\psi$ decays to $\gamma \varphi$
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• Test of $CP$ Symmetry in Hyperon to Neutron Decays
• Observation of the Anomalous Shape of $X(1840)$ in $J/\psi \to \gamma 3({\pi }^{+}{\pi }^{-})$ Indicating a Second Resonance Near $p\bar{p}$ Threshold
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• Precision measurement of the $D^{\ast 0}$ decay branching fractions
• Observation of $h_c$ radiative decay $h_c\to \gamma {\eta }^{\prime }$ and evidence for $h_c\to \gamma \eta$
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• Observation of $e^{+}{e}^{-}\to \eta h_c$ at center-of-mass energies from 4.085 to 4.600 GeV
• Precision measurement of the branching fractions of ${\eta }^{\prime }$ decays
• Measurements of the branching fractions of ${\eta }_c\to K^{+}{K}^{-}{\pi }^0$, $K_S^0{K}^{\pm }{\pi }^{\mp }$,$2({\pi }^{+}{\pi }^{-}{\pi }^0)$, and $p\bar{p}$
• Measurements of $e^{+}{e}^{-}\to K_S^0{K}^{\pm }{\pi }^{\mp }{\pi }^0$ and $K_S^0{K}^{\pm }{\pi }^{\mp }\eta$ at center-of-mass energies from $3.90$ to $4.60\mathrm{GeV}$
• Search for the ${\eta }_c(2S)/h_c\to p\bar{p}$ decays and measurements of the ${\chi }_{cJ}\to p\bar{p}$ branching fractions
• Measurements of the branching fractions of $\psi (3686)\to {\bar{\Sigma }}^0\Lambda +c.c.$ and ${\chi }_{cJ(J=0,1,2)}\to \Lambda \bar{\Lambda }$
• Measurement of higher-order multipole amplitudes in $\psi (3686)\to \gamma {\chi }_{c1,2}$ with ${\chi }_{c1,2}\to \gamma J/\psi$ and search for the transition ${\eta }_c(2S)\to \gamma J/\psi$
• Observation of $\psi (3686)\to p\bar{p}{\eta }^{\prime }$ and improved measurement of $J/\psi \to p\bar{p}{\eta }^{\prime }$
• Observation of ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\mu }^{+}{\mu }^{-}$
• Measurement of $e^{+}{e}^{-}\to \eta J/\psi$ Cross Section from $\sqrt{s}=$ 3.808 GeV to 4.951 GeV
• Search for new decay modes of the ${\psi }_2(3823)$ and the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$
• Cross section measurements of the $e^{+}{e}^{-}\to D^{\ast +}{D}^{\ast -}$ and $e^{+}{e}^{-}\to D^{\ast +}{D}^{-}$ processes at center-of-mass energies from 4.085 to 4.600 GeV
• Observation of ${\eta }^{\prime }\to \omega e^{+}{e}^{-}$
• Observation of $e^{+}{e}^{-}\to \varphi {\chi }_{c1}$ and $\varphi {\chi }_{c2}$ at $\sqrt{s}$=4.600 GeV
• Search for the isospin violating decay $Y(4260)\to J/\psi \eta {\pi }^0$
• Observation of $\psi (3686)\to {\eta }^{\prime }{e}^{+}{e}^{-}$
• Search for the weak decay ${\eta }^{\prime }\to K^{\pm }{\pi }^{\mp }$ and precise measurement of the branching fraction $\mathcal{B}(J/\psi \to \varphi {\eta }^{\prime })$
• Search for the weak decays $J/\psi \to D_s^{(\ast )}e{\nu }_e$
• Measurement of $\psi (3686)\to \Lambda \bar{\Lambda }\eta$ and $\psi (3686)\to \Lambda \bar{\Lambda }{\pi }^0$ decays
• First observations of $h_c\to$ hadrons
• Measurement of $e^{+}{e}^{-}\to \gamma {\chi }_{c0,c1,c2}$ cross sections at center-of-mass energies between 3.77 and 4.60 GeV
• Search for $\psi (3686)\to \gamma {\eta }_c(\eta (1405))\to \gamma {\pi }^{+}{\pi }^{-}{\pi }^0$
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• Search for the rare decays $J/\psi \to D^0{e}^{+}{e}^{-}+c.c.$ and $\psi (3686)\to D^0{e}^{+}{e}^{-}+c.c.$
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• Observation of OZI suppressed decays ${\chi }_{cJ}\to \omega \varphi$
• First observation of the decay ${\chi }_{cJ}\to {\Sigma }^{+}\bar{p}{K}_S^0+c.c.(J=0,1,2)$
• Measurement of branching fractions for $\psi (3686)\to \gamma {\eta }^{\prime },\gamma \eta$ and $\gamma {\pi }^0$
• Observation of the decays ${\chi }_{cJ}\to {\Sigma }^0\bar{p}{K}^{+}+c.c.(J=0,1,2)$
• Study of electromagnetic Dalitz decays ${\chi }_{cJ}\to {\mu }^{+}{\mu }^{-}J/\psi$
• Updated measurements of the M1 transition $\psi (3686)\to \gamma {\eta }_c(2S)$ with ${\eta }_c(2S)\to K\bar{K}\pi$
• Search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$
• Search for $X(3872)\to {\pi }^0{\chi }_{c0}$ and $X(3872)\to \pi \pi {\chi }_{c0}$ at BESIII
• Search for the $X(2370)$ and observation of ${\eta }_c\to \eta \eta {\eta }^{\prime }$ in $J/\psi \to \gamma \eta \eta {\eta }^{\prime }$
• Observation of the double Dalitz decay ${\eta }^{\prime }\to e^{+}{e}^{-}{e}^{+}{e}^{-}$
• Observation of ${\chi }_{cJ}\to \Lambda \bar{\Lambda }\eta$
• Improved measurements of ${\chi }_{cJ}\to {\Sigma }^{+}{\bar{\Sigma }}^{-}$ and ${\Sigma }^0{\bar{\Sigma }}^0$ decays
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• Improved measurement of the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+(0)}{\pi }^{-(0)}$ and search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$
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• Study of two-photon decays of pseudoscalar mesons via $J/\psi$ radiative decays
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• Observation of the helicity-selection-rule suppressed decay of the ${\chi }_{c2}$ charmonium state
• Pion transitions from χ_{cJ} to η_c
• Measurement of the branching fraction for $\psi (3686)\to \omega K^{+}{K}^{-}$
• Improved measurements of the Dalitz decays $\eta /{\eta }^{\prime }\to \gamma e^{+}{e}^{-}$
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• Observation of the decays ${\chi }_{cJ}\to \varphi \varphi \eta$
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• Search for the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$
• Observation of the $\psi (3686)$ decays into ${\Sigma }^{+}{\bar{\Sigma }}^{-}\omega$ and ${\Sigma }^{+}{\bar{\Sigma }}^{-}\varphi$
• Observation of $\psi (3686)\to 3\varphi$
• Partial wave analyses of $\psi (3686)\to p\bar{p}{\pi }^0$ and $\psi (3686)\to p\bar{p}\eta$
• Searches for isospin-violating transitions ${\chi }_{c0,2}\to {\pi }^0{\eta }_c$
• On the Utility Function of Experiments in Fundamental Science
• Study of $\eta \to {\pi }^{+}{\pi }^{-}{l}^{+}{l}^{-}$
• Observation of Transverse Polarization and Determination of Psionic Form Factors of the $\Lambda$ Hyperon at $\sqrt{s}=3.773$ GeV
• Observation of a threshold enhancement in the ${\pi }^{+}{\pi }^{-}$ spectrum in $\psi (3686)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays
• Study of the Magnetic Dipole Transition of $J/\psi \to \gamma {\eta }_c$ via ${\eta }_c\to p\bar{p}$
• Observation of the decay $h_c\to 3({\pi }^{+}{\pi }^{-}){\pi }^0$
• Observation of ${\chi }_{c2}\to {\eta }^{\prime }{\eta }^{\prime }$ and ${\chi }_{c0,2}\to \eta {\eta }^{\prime }$
• Search for intermediate resonances and dark gauge bosons in $J/\psi \to \gamma {\pi }^0{\eta }^{\prime }$
• Measurement of the branching fraction for $\psi (3686)\to \omega K_S^0{K}_S^0$
• Observation of $\psi (3686)\to \gamma \eta (1405)$ via $\eta (1405)\to f_0(980){\pi }^0$
• Two-pion transitions from the $P$-wave to $S$-wave charmonium states
• Observation of ${\chi }_{cJ}\to p\bar{p}{K}_S^0{K}^{-}{\pi }^{+}+c.c.$
• First measurements of the branching fractions of $J/\psi \to {\Xi }^0\bar{\Lambda }{K}_S^0+c.c.$, $J/\psi \to {\Xi }^0{\bar{\Sigma }}^0{K}_S^0+c.c.$, and $J/\psi \to {\Xi }^0{\bar{\Sigma }}^{-}{K}^{+}+c.c.$
• Precise Measurement of the ${\chi }_{c0}$ Resonance Parameters and Branching Fractions of ${\chi }_{c0,c2}\to {\pi }^{+}{\pi }^{-}/K^{+}{K}^{-}$
• Search for the decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$ at BESIII
• Search for the isospin-violating decays ${\mathbf{\chi }}_{\mathbf{cJ}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$ and ${\mathbf{\eta }}_{\mathbf{c}}\to \mathbf{\Lambda }{\bar{\mathbf{\Sigma }}}^0+\mathbf{c}.\mathbf{c}.$
• Amplitude analysis and branching fraction measurement of $J/\psi \to \Lambda {\bar{\Sigma }}^0\eta +c.c$
• Measurement of the double Dalitz decay $\eta \to e^{+}{e}^{-}{e}^{+}{e}^{-}$
• Observation of the decay $\psi (3686)\to {\Sigma }^0{\bar{\Sigma }}^0\omega$
• Measurements of the branching fractions of the $P$-wave charmonium spin-singlet state $h_c{(}^1{P}_1)\to h^{+}{h}^{-}{\pi }^0/\eta$
• Search for $h_c\to {\pi }^{+}{\pi }^{-}J/\psi$ via $\psi (3686)\to {\pi }^0{h}_c$
• Search for the baryon and lepton number violating decay $J/\psi \to p{e}^{-}$ + c.c
• Measurement of the $\eta$ transition form factor through ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}\eta$ decay
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• Observation of the electromagnetic radiative decays of the \boldmath{$\Lambda (1520)$} and \boldmath{$\Lambda (1670)$} to \boldmath{$\gamma {\Sigma }^0$}
• Helicity amplitude and branching fraction measurement of ${\chi }_{cJ}\to \Lambda \bar{\Lambda }$