Search for $X(3872)\to\pi^0\pi^0\chi_{c1,2}$

TL;DR

This study searches for specific decay modes of the X(3872) particle into neutral pions and chi_c states using electron-positron collision data, setting upper limits on their branching fractions due to no significant evidence found.

Contribution

First search for $X(3872)$ decays into $ ext{ extbackslash}chi_{c1,2}$ with neutral pions, establishing upper limits on their branching ratios.

Findings

No significant evidence for the decays was observed.

Upper limits on branching ratios were set at 90% confidence level.

Results constrain theoretical models of $X(3872)$ decays.

Abstract

Using 10.1 fb$^{-1}$ of $e^+e^-$ collision data collected by the BESIII detector with center-of-mass energies between 4.15 GeV and 4.30 GeV, we search for the decays $X(3872)\to\pi^0\pi^0\chi_{c1,2}$, where the $X(3872)$ is produced in $e^+e^-\to\gamma X(3872)$. No evidence above $3\sigma$ is found for either decay. Upper limits at the $90\%$ C.L. on the branching fractions of $X(3872)\to\pi^0\pi^0\chi_{c1,2}$ normalized to the branching fraction of $X(3872)\to\pi^+\pi^-J/\psi$ are set to be $\mathcal{B}(X(3872)\to\pi^0\pi^0\chi_{c1})/\mathcal{B}(X(3872)\to\pi^+\pi^-J/\psi) < 1.1$ and $\mathcal{B}(X(3872)\to\pi^0\pi^0\chi_{c2})/\mathcal{B}(X(3872)\to\pi^+\pi^-J/\psi) < 0.5$, taking into account both statistical and systematic uncertainties.