Based on e)e− collision data corresponding to an integrated luminosity of about 4.5 fb−1 collected at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the absolute branching fraction of the Cabibbo-favored decay Λ+c → ΛK0SK+ is measured to be (3.12 ± 0.46 ± 0.15) × 10−3. Combined with a previous measurement from the BESIII Collaboration, the branching fraction of the decay Λ+c → ΛK0SK+ is calculated to be (3.07 ± 0.26 ± 0.13) × 10−3. The decay Λ+c → Ξ0K0Sπ) is observed for the first time with a statistical significance of 6.6σ, and its branching fraction is determined to be (3.70 ± 0.60 ± 0.21) × 10−3. In addition, a search for the decay Λ+c → Σ0K0SK+ is performed, and its branching fraction is determined to be (0.80$$ ± 0.16) × 10−3, corresponding to an upper limit of 1.28 × 10−3 at a 90% confidence level. These measurements provide new information that can be used to distinguish between theoretical models.
Measurement of the branching fractions of the Cabibbo-favored decays Λc+→ΛKS0K+ and Λc+→Ξ0KS0π+ and search for Λc+→Σ0KS0K+
A. Amoroso;F. Bianchi;A. Bortone;M. Destefanis;F. De Mori;M. Greco;M. Maggiora;S. Marcello;S. Sosio;S. Spataro;
2025-01-01
Abstract
Based on e)e− collision data corresponding to an integrated luminosity of about 4.5 fb−1 collected at center-of-mass energies between 4599.53 and 4698.82 MeV with the BESIII detector, the absolute branching fraction of the Cabibbo-favored decay Λ+c → ΛK0SK+ is measured to be (3.12 ± 0.46 ± 0.15) × 10−3. Combined with a previous measurement from the BESIII Collaboration, the branching fraction of the decay Λ+c → ΛK0SK+ is calculated to be (3.07 ± 0.26 ± 0.13) × 10−3. The decay Λ+c → Ξ0K0Sπ) is observed for the first time with a statistical significance of 6.6σ, and its branching fraction is determined to be (3.70 ± 0.60 ± 0.21) × 10−3. In addition, a search for the decay Λ+c → Σ0K0SK+ is performed, and its branching fraction is determined to be (0.80$$ ± 0.16) × 10−3, corresponding to an upper limit of 1.28 × 10−3 at a 90% confidence level. These measurements provide new information that can be used to distinguish between theoretical models.| File | Dimensione | Formato | |
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