Search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$

Abstract

Using a data sample corresponding to an integrated luminosity of 10.9 fb${}^{-1}$ collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$ in the radiative production $e^{+}{e}^{-}\to \gamma {\chi }_{c1}(3872)$. No significant signal is observed, and the ratio for the branching fraction of ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$ to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ is measured as $\mathcal{R}\equiv \frac{\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}]}{\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi ]}<0.18$ at 90$\%$ confidence level. The upper limit on the product of the cross section $\sigma [e^{+}{e}^{-}\to \gamma {\chi }_{c1}(3872)]$ and the branching fraction $\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}]$ at each center-of-mass energy is also given. These measurements favor the non-conventional charmonium nature of the ${\chi }_{c1}(3872)$ state.

8 pages, 1 figure

References in corpus (11)

• Precise measurement of the $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ cross section at center-of-mass energies from 3.77 to 4.60 GeV
• Four-Quark Hadrons: an Updated Review
• Method for detector description transformation to Unity and application in BESIII
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• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Pionic transitions from X(3872) to chi_{cJ}
• Observation of the decay $X(3872)\to {\pi }^0{\chi }_{c1}(1P)$
• Observation of resonance structures in $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}{\psi }_2(3823)$ and mass measurement of ${\psi }_2(3823)$
• Cross section measurement of $e^{+}{e}^{-}\to {\eta }^{\prime }J/\psi$ from $\sqrt{s}=4.178$ to $4.600$ GeV
• Observation of a New $X(3872)$ Production Process $e^{+}{e}^{-}\to \omega X(3872)$

Cited by in corpus (2)

• Constrain the ${\chi }_{cJ}\to D^{(\ast )}{\bar{D}}^{(\ast )}$ effective couplings via the $X(3872)\to {\pi }^0{\chi }_{cJ}$ decays
• Search for the decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$ at BESIII