High Energy Physics - Experiment
[Submitted on 2 Mar 2026 (v1), last revised 4 Jun 2026 (this version, v2)]
Title:Search for the charmonium weak decay $ψ(2S)\to D_s^-π^+ + c.c.$ and $ψ(2S)\to D_s^-ρ^+ + c.c.$
View PDF HTML (experimental)Abstract:We search for the weak decays $\psi(2S)\to D_s^-\pi^+ + c.c.$ and $\psi(2S)\to D_s^-\rho^+ + c.c.$ for the first time. The search is based on $(2712.4\pm14.3)\times 10^6$ events containing the charmonium state $\psi(2S)$ collected at the center-of-mass energy $\sqrt{s}=3.686\ \rm{GeV}$ with the BESIII detector. This search offers a unique opportunity to test the Standard Model and search for new physics. Since no signal excess above the background is observed, the upper limits on the branching fractions at the 90\% confidence level are set to be $1.4\times 10^{-6}$ and $7.0\times 10^{-6}$ for $\psi(2S)\to D_s^-\pi^+ + c.c.$ and $\psi(2S)\to D_s^-\rho^+ + c.c.$, respectively.
Submission history
From: Kaixin Fan [view email][v1] Mon, 2 Mar 2026 12:03:20 UTC (1,099 KB)
[v2] Thu, 4 Jun 2026 14:02:05 UTC (897 KB)
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