Measurements of χcJ→K+K−K+K− decays

Using 14M ψ(2S) events taken with the BESII detector, χcJ→2(K+K−) decays are studied. For the four-kaon final state, the branching fractions are B(χc0,1,2→2(K+K−))=(3.48±0.23±0.47)×10−3, (0.70±0.13±0.10)×10−3, and (2.17±0.20±0.31)×10−3. For the ϕK+K− final state, the branching fractions, which are measured for the first time, are B(χc0,1,2→ϕK+K−)=(1.03±0.22±0.15)×10−3, (0.46±0.16±0.06)×10−3, and (1.67±0.26±0.24)×10−4. For the ϕϕ final state, B(χc0,2→ϕϕ)=(0.94±0.21±0.13)×10−3 and (1.70±0.30±0.25)×10−3.