Search for the FCNC charmonium decay J/ψ → D 0 μ + μ − + c.c

Journal article

Based on a data sample of (10087 ± 44) × 106J/ψ events taken with the BESIII detector, we search for the flavor-changing neutral current charmonium decay J/ψ → D0μ+μ− + c.c. . No significant signal above the background is observed, and the upper limit on its branching fraction is set to be ℬ(J/ψ → D0μ+μ− + c.c.) < 1.1 × 10−7 at the 90% confidence level. This marks the first search for a flavor-changing neutral current charmonium decay involving muons in the final state.

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: 4
• Article number: 61
• Publication date: 2025-04-09
• Acceptance date: 2025-03-13
• DOI: 10.1007/jhep04(2025)061
• EISSN: 1029-8479
• ISSN: 1126-6708
• Language: English
• Keywords: e+-e− Experiments; Flavour Changing Neutral Currents; Rare Decay; Quarkonium