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.

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

References in corpus (9)

• An Introduction to PYTHIA 8.2
• Four-Quark Hadrons: an Updated Review
• Is the X(3872) Production Cross Section at Tevatron Compatible with a Hadron Molecule Interpretation?
• Study of $e^{+}{e}^{-}\to \gamma \omega J/\psi$ and Observation of $X(3872)\to \omega J/\psi$
• Measurements of $\psi (2S)$ and $X(3872)\to J/\psi {\pi }^{+}{\pi }^{-}$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of integrated luminosities at BESIII for data samples at center-of-mass energies between 4.0 and 4.6 GeV
• Amplitude analysis of the ${\chi }_{c1}\to \eta {\pi }^{+}{\pi }^{-}$ decays
• Observation of the decay $X(3872)\to {\pi }^0{\chi }_{c1}(1P)$
• Precision measurement of the matrix elements for $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta \to {\pi }^0{\pi }^0{\pi }^0$ decays

Cited by in corpus (1)

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