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September 27, 2025Open Access

Search for J/ψ→KS0KS0 and…

Key Points

No significant signals were found over expected background yields, leading to new upper limits on branching fractions observed.
The upper limit for branching fractions of J/ψ→K S0K S0 is set at less than 4.7×10−9 at 90% confidence level.
Analysis of 10,087 J/ψ events and 2,712.4 ψ(3686) events collected using the BESIII detector at the BEPCII collider.
Findings improve previous limits for J/ψ by a factor of three, indicating more stringent constraints on potential decays.

Abstract

Using data samples of (10087±44)×106 J/ψ events and (2712.4±14.3)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we search for the CP violating decays J/ψ→KS0KS0 and ψ(3686)→KS0KS0. No significant signals are observed over the expected background yields. The upper limits on their branching fractions are set as B(J/ψ→KS0KS0)4.7×10−9 and B(ψ(3686)→KS0KS0)1.1×10−8 at the 90% confidence level. These results improve the previous limits by a factor of three for J/ψ→KS0KS0 and two orders of magnitude for ψ(3686)→KS0KS0.

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