Search for the charmonium weak decays $J/\psi\to D_{s}^{-}\rho^{+}+c.c.$ and $J/\psi\to D_{s}^{-}\pi^{+}+c.c.$

TL;DR

This study searches for rare weak decays of the J/psi particle into specific final states, setting upper limits on their branching fractions due to no observed signals, thus constraining theoretical models.

Contribution

First experimental search for these specific J/psi weak decays, establishing the most stringent upper limits to date.

Findings

No signal observed for the decays.

Upper limits on branching fractions set at 8.0×10⁻⁷ and 4.1×10⁻⁷.

Results constrain theoretical predictions of rare charmonium decays.

Abstract

Based on $(10087\pm44)\times 10^6$ $J/\psi$ events recorded with the BESIII detector, we search for the rare charmonium weak decays $J/\psi\to D_{s}^{-}\rho^{+}+c.c.$ and $J/\psi\to D_{s}^{-}\pi^{+}+c.c.$ No signal is observed, and upper limits on the branching fractions at the $90\%$ confidence level are set as $\mathcal{B}(J/\psi\to D_{s}^{-}\rho^{+}+c.c.)<8.0\times10^{-7}$ and $\mathcal{B}(J/\psi\to D_{s}^{-}\pi^{+}+c.c.)<4.1\times10^{-7}$. Our results provide the most stringent experimental constraints on these decays.