Improved measurement of absolute branching fraction of the inclusive decay Λ c + → K S 0 X

Journal article

By analyzing 4.5 fb−1 of e+e− collision data accumulated with the BESIII detector at center-of-mass energies ranging from 4599.53 MeV to 4698.82 MeV, we report the measurement of the absolute branching fraction (BF) of the inclusive decay Λc+→KS0X using the double-tag technique. The result is BΛc+→KS0X = (10.9 ± 0.2 ± 0.1)%, where the first uncertainty is statistical and the second is systematic. This result indicates that there are still undiscovered decay channels containing KS0 in the final state with a combined BF of (3.0 ± 0.4)%. The BF of the inclusive decay Λc+→K¯0/K0X is calculated to be BΛc+→K¯0/K0X = (21.8 ± 0.4 ± 0.2)%, The result is in agreement with the prediction of the statistical isospin model.

Authors: Ablikim, M; Achasov, MN; Adlarson, P; Ai, XC; Aliberti, R

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: Springer
• Journal: Journal of High Energy Physics
• Volume: 2025
• Issue: 6
• Article number: 194
• Publication date: 2025-06-19
• Acceptance date: 2025-05-18
• DOI: 10.1007/jhep06(2025)194
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Branching fraction; e+-e− Experiments; Charm Physics