Study Of The Radiative Decays Of χ_cJ→γV（ρ,φ,ω）

Using 447.9M ψ(2S)data collected by BESIII in 2009 and 2012,we study the radiative decays χcJ→γV(J=0,1,2,V=ρ,φ,ω),and measure their branching fractions:B(χc1→γρ)=(202.7±3.8±11.6)× 10-6,B(χc2→γρ)=(16.5±2.1±1.3)× 10-6,B(χc0→γφ)=(3.27±1.21±0.33)×10-6,B(χc1→γφ)=(24.3±2.21±1.12)×10-6,B(χc2 →γφ)=(3.0±1.12±0.55)× 10-6,B(χc0 →γω)=(9.35±1.96±0.94)× 10-6,B(χc1→γω)=(69.87±3.17±3.77)× 10-6,B(χc2→γω)=(3.10±1.24±3.32)×10-6,where the first statistical,and the second ones are systematic.We observe χc2 →γp andχc0→γω for the first time with the significance of 8.8σ and 5.0σ,respectively.In addition,we also perform helicity amplitude analysis with the large samples of χcJ→γV(ρ,φ,ω).In addition,the fractions of the transverse polarization component of the vector meson in χc1→γV decays are measured to be 0.052±0.009±0.004 for fT(χc1→γρ),0.12±0.05±0.04 for fT(χc1→γφ),and 0.060±0.022±0.011 for fT(χc1→γω),respectively.