Measurements of the absolute branching fractions of the doubly Cabibbo-suppressed decays D + → K + π 0, D + → K + η and D + → K + η′

Journal article

Using 20.3 fb−1 of e+e− collision data collected at a center-of-mass energy of 3.773 GeV with the BESIII detector, we present the measurements of the absolute branching fractions of the doubly Cabibbo-suppressed decays D+ → K+π0, D+ → K+η and D+ → K+η′ with the double-tag method, with significantly improved precision compared to the previous measurements. The statistical significance of each signal decay exceeds 10σ. The branching fractions are determined to be ℬ(D+ → K+π0) = (1.45 ± 0.06 ± 0.08) × 10−4, ℬ(D+ → K+η) = (1.17 ± 0.10 ± 0.03) × 10−4 and ℬ(D+ → K+η′) = (1.88 ± 0.15 ± 0.11) × 10−4, where the first uncertainties are statistical and the second systematic. The branching fractions of D+→ K+η and D+→ K+η′ are consistent with the world average values. The reported branching fraction of D+→ K+π0 deviates with the world average value by 3σ.

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: 10
• Article number: 178
• Publication date: 2025-10-21
• Acceptance date: 2025-09-13
• DOI: 10.1007/jhep10(2025)178
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: Branching fraction; e+-e− Experiments; Charm Physics