Search for the decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$ at BESIII

Abstract

Using a 10.9 fb${}^{-1}$ data sample collected by the BESIII detector at center-of-mass energies from 4.16 to 4.34 GeV, we search for the charmless decays $X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }$ and $K^{\ast }(892)\bar{K}$, where the $X(3872)$ is produced via the radiative process $e^{+}{e}^{-}\to \gamma X(3872)$. No significant signal is observed. We set upper limits on the relative branching fractions $\mathcal{B}[X(3872)\to K_S{K}^{\pm }{\pi }^{\mp }]/\mathcal{B}[X(3872)\to {\pi }^{+}{\pi }^{-}J/\psi ]<0.07$ and $\mathcal{B}[X(3872)\to K^{\ast }(892)\bar{K}]/\mathcal{B}[X(3872)\to {\pi }^{+}{\pi }^{-}J/\psi ]<0.10$ at the 90$\%$ confidence level. Additionally, upper limits on the product of the cross section $\sigma [e^{+}{e}^{-}\to \gamma X(3872)]$ and the branching fractions $\mathcal{B}[X(3872)\to K_S^0{K}^{\pm }{\pi }^{\mp }]$ and $\mathcal{B}[X(3872)\to K^{\ast }(892)\bar{K}]$ are reported at each energy point. In all cases, $K^{\ast }(892)\bar{K}$ refers to the sum of the modes $K^{\ast }(892{)}^{+}{K}^{-}+\text{c.c.}$ and $K^{\ast }(892{)}^0{\bar{K}}^0+\text{c.c.}$, where c.c. denotes the corresponding charge-conjugate modes.

11 pages, 1 figure

References in corpus (13)

• An Introduction to PYTHIA 8.2
• Can the X(3872) be a 1^{++} four-quark state?
• Pion Interactions in the X(3872)
• 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
• Measurements of the center-of-mass energies of $e^{+}{e}^{-}$ collisions at BESIII
• Observation of sizeable $\omega$ contribution to ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}J/\psi$ decays
• Study of the lineshape of $X(3872)$ using $B$ decays to $D^0\overline{D}{}^{\ast 0}K$
• Study of charmonium decays to $K_S^{0}K\pi$ in the $B\to (K_S^{0}K\pi )K$ channels
• Measurements of $\psip$ decays into $\gamma K\bar{K}\pi$ and $γη\pipi$
• Search for the decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}{\chi }_{c1}$
• Observation of $\psi (3686)\to p\bar{p}\varphi$
• Search for the light hadron decay ${\chi }_{c1}(3872)\to {\pi }^{+}{\pi }^{-}\eta$