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

Abstract

With a data sample corresponding to an integrated luminosity of 11.5~fb${}^{-1}$ collected with the BESIII detector operating at the BEPCII storage ring, for the first time the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$ is searched for. While no significant signal is observed, the upper limits at the 90\% confidence level for $\sigma [e^{+}{e}^{-}\to \gamma {\chi }_{c1}(3872)]\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta ]$ at center-of-mass energies from 4.13 to 4.34 GeV are determined. By normalizing to the ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decay channel, a 90\% confidence level upper limit for the branching fraction ratio $\mathcal{R}=\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta ]/\mathcal{B}[{\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi ]<0.12$ is given. These measurements provide important inputs for understanding the internal structure of the ${\chi }_{c1}(3872)$ resonance.

arXiv comment11 pages, 5 figures, version to appear in PRD(L)

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