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October 16, 2025Open Access

Study of ϕ→KK¯ and KS<…

Key Points

The absolute branching fraction for the hadronic decay of the D meson is evaluated at 1.86% ± 0.06% (stat) ± 0.03% (syst).
Using data from the BESIII detector collected at center-of-mass energies of 4.128 to 4.226 GeV, this analysis provides unique insights.
An amplitude analysis performed indicates significant deviations from previous measurements recorded by the Particle Data Group by more than 3σ.
The study underscores the importance of precise measurements of branching fractions in improving our understanding of D meson decays.

Abstract

Using e+e− annihilation data corresponding to a total integrated luminosity of 7. 33 fb−1 collected at center-of-mass energies between 4. 128 and 4. 226 GeV with the BESIII detector, we provide the first amplitude analysis and absolute branching fraction measurement of the hadronic decay Ds+→KS0KL0π+. The branching fraction of Ds+→KS0KL0π+ is determined to be (1. 86±0. 06stat±0. 03syst) %. Combining the BDs+→ϕ (→KS0KL0) π+ obtained in this Letter and the world average of BDs+→ϕ (→K+K−) π+, we measure the relative branching fraction B (ϕ→KS0KL0) /B (ϕ→K+K−) = (0. 593±0. 023stat±0. 014syst±0. 016ϕπ), where the third error is due to the uncertainty of the B (Ds+→ϕπ+, ϕ→K+K−). Our result deviates from the Particle Data Group value by more than 3σ. Furthermore, the asymmetry of the branching fractions of Ds+→KS0K* (892) + and Ds+→KL0K* (892) +, (BDs+→KS0K* (892) +−BDs+→KL0K* (892) +/BDs+→KS0K* (892) ++BDs+→KL0K* (892) +), is determined to be (−14. 5±5. 1stat±1. 8syst) %.

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