Production of χc1 and χc2 in pp¯ Collisions at s = 1.8 TeV

We have measured the ratio of prompt production rates of the charmonium states χ_c1 and χ_c2 in 110 pb^-1 of pp¯ collisions at s = 1.8 TeV. The photon from their decay into J/ψγ is reconstructed through conversion into e⁺e^- pairs. The energy resolution this technique provides makes the resolution of the two states possible. We find the ratio of production cross sections σ_χc2σ_χc1 = 0.96+/-0.27\(stat\)+/-0.11\(syst\) for events with p_T\(J/ψ\)>4.0 GeV/c, \|η\(J/ψ\)\|<0.6, and p_T\(γ\)>1.0 GeV/c.