ISSN - 15507998, Physical Review D - Particles, Fields, Gravitation and Cosmology, 2011, vol. 83, p. -
Study of χcJ radiative decays into a vector meson
The decays χcJ→γV (V=φ, ρ0, ω) are studied with a sample of radiative ψ′→γχ cJ events in a sample of (1.06±0.04) ×108ψ′ events collected with the BESIII detector. The branching fractions are determined to be: B(χc1→γ φ)=(25.8±5.2±2.3)×10-6, B(χ c1→γρ0)=(228±13±22)×10 -6, and B(χc1→γω)=(69.7±7. 2±6.6)×10-6. The decay χ c1→γφ is observed for the first time. Upper limits at the 90% confidence level on the branching fractions for χc0 and χc2 decays into these final states are determined. In addition, the fractions of the transverse polarization component of the vector meson in χc1→γV decays are measured to be 0.29-0.12-0.09+0. 13+0.10 for χc1→γ φ, 0.158±0.034-0.014+0. 015 for χc1→γρ0, and 0.247-0.087-0.026+0.090+0.044 for χc1→γω, respectively. The first errors are statistical and the second ones are systematic. © 2011 American Physical Society.