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.

8 pages, 4 figures

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• Multiquark Resonances
• Exotics: Heavy Pentaquarks and Tetraquarks
• 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
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• Pionic transitions from X(3872) to chi_{cJ}
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• Hadronic molecules in B decays
• The BESIII Physics Programme
• A Phenomenological analysis on isospin-violating decay of $X(3872)$
• Measurements of the center-of-mass energies of $e^{+}{e}^{-}$ collisions at BESIII
• Charmonium and Charmoniumlike States at the BESIII Experiment
• Search for $X(3872)$ and $X(3915)$ decay into ${\chi }_{c1}{\pi }^0$ in $B$ decays at Belle
• Radiative and pionic transitions $Z_c(4020{)}^0\to X(3872)\gamma$ and $Z_c(4020{)}^{\pm }\to X(3872){\pi }^{\pm }$
• Decay $X(3872)\to {\pi }^0{\pi }^{+}{\pi }^{-}$ and $S$-wave $D^0{\bar{D}}^0\to {\pi }^{+}{\pi }^{-}$ scattering length
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• 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
• Study of $e^{+}{e}^{-}\to \omega X(3872)$ and $\gamma X(3872)$ from 4.66 to 4.95 GeV
• Search for the radiative transition ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$
• Search for the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$
• Constrain the ${\chi }_{cJ}\to D^{(\ast )}{\bar{D}}^{(\ast )}$ effective couplings via the $X(3872)\to {\pi }^0{\chi }_{cJ}$ decays
• Exotic Charmonium at BESIII
• Exotic hadrons associated with $b$-quark
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