2025/12/16 by M. Ablikim, BESIII Collaboration, Ablikim, M. +779
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #High-Energy Particle Collisions Research
paper · pdf · doi:10.48550/arxiv.2512.14369
Using a sample of (2712.4 ± 14.3)× 106 ~ψ(3686) events collected by the BESIII detector at the BEPCII collider, we measure the branching fractions of the decays χcJ→ ϕϕη,~ϕϕη′, and~ϕK+K-η (J = 0, 1, 2). The obtained branching fractions are B(χc0 → ϕϕη) = (7.40 ± 0.23 ± 0.55)×10-4, B(χc1 → ϕϕη) = (3.33 ± 0.14 ± 0.25)×10-4, B(χc2 → ϕϕη) = (5.46 ± 0.17 ± 0.40)×10-4, B(χc0 → ϕϕη^′) = (2.96 ± 0.23 ± 0.29)×10-4, B(χc1 → ϕϕη^′) = (0.69 ± 0.10 ± 0.08)×10-4, B(χc2 → ϕϕη^′) = (0.65 ± 0.09 ± 0.07)×10-4, B(χc0 → ϕK+K-η) = (1.23 ± 0.08 ± 0.10)×10-4, B(χc1 → ϕK+K-η) = (1.00 ± 0.07 ± 0.07)×10-4, and B(χc2 → ϕK+K-η) = (1.82 ± 0.09 ± 0.14)×10-4, where K+K- is not from the decay of a ϕ meson, the first uncertainties are statistical and the second systematic. The branching fractions of χcJ→ ϕϕη are measured with precision improved by factors of 1.5-1.9, and those of χcJ→ ϕϕη^′ and ϕK+K-η are measured for the first time.