Search for the radiative transition ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$

Abstract

Using 9.0 $\mathrm{f}{\mathrm{b}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies from 4.178 to 4.278 GeV with the BESIII detector at the BEPCII collider, we perform the first search for the radiative transition ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$. No ${\chi }_{c1}(3872)\to \gamma {\psi }_2(3823)$ signal is observed. The upper limit on the ratio of branching fractions $\mathcal{B}({\chi }_{c1}(3872)\to \gamma {\psi }_2(3823),{\psi }_2(3823)\to \gamma {\chi }_{c1})/\mathcal{B}({\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi )$ is set as 0.075 at the 90\% confidence level. Our result contradicts theoretical predictions under the assumption that the ${\chi }_{c1}(3872)$ is the pure charmonium state ${\chi }_{c1}(2P)$.

8 pages, 2 figures

References in corpus (8)

• Higher Charmonia and X,Y,Z states with Screened Potential
• Study of the lineshape of the ${\chi }_{c1}(3872)$ state
• Study of $e^{+}{e}^{-}\to \gamma \omega J/\psi$ and Observation of $X(3872)\to \omega J/\psi$
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Study of open-charm decays and radiative transitions of the X(3872)
• Observation of the decay $X(3872)\to {\pi }^0{\chi }_{c1}(1P)$
• Measurements of the Absolute Branching Fractions of $B^{\pm }\to K^{\pm }{X}_{c\bar{c}}$
• Search for new decay modes of the ${\psi }_2(3823)$ and the process $e^{+}{e}^{-}\to {\pi }^0{\pi }^0{\psi }_2(3823)$