Observation of the decay $X(3872)\to {\pi }^0{\chi }_{c1}(1P)$

Abstract

Using a total of $9.0{\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data with center-of-mass energies between 4.15 and 4.30 GeV collected by the BESIII detector, we search for the processes $e^{+}{e}^{-}\to \gamma X(3872)$ with $X(3872)\to {\pi }^0{\chi }_{cJ}$ for $J=0,1,2$. We report the first observation of $X(3872)\to {\pi }^0{\chi }_{c1}$, a new decay mode of the $X(3872)$, with a statistical significance of more than 5$\sigma$. Normalizing to the previously established process $e^{+}{e}^{-}\to \gamma X(3872)$ with $X(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$, we find $\mathcal{B}(X(3872)\to {\pi }^0{\chi }_{c1})/\mathcal{B}(X(3872)\to {\pi }^{+}{\pi }^{-}J/\psi )=0.88_{-0.27}^{+0.33}\pm 0.10$, where the first error is statistical and the second is systematic. We set 90% confidence level upper limits on the corresponding ratios for the decays to ${\pi }^0{\chi }_{c0}$ and ${\pi }^0{\chi }_{c2}$ of 19 and 1.1, respectively.

arXiv comment8 pages, 4 figures

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