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.

arXiv comment8 pages, 1 figure

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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