Ground and excited charmonium state production in p+p collisions at   sqrt(s)=200 GeV
  We report on charmonium measurements [J/psi(1S), psi'(2S), and chi_c(1P)] in p+p collisions at sqrt(s)=200 GeV. We find that the fraction of J/psi coming from the feed-down decay of psi' and chi_c in the midrapidity region ($|\eta|<0.35$) is 9.6+/-2.4% and 32+/-9%, respectively. We also report new, higher statistics p_T and rapidity dependencies of the J/psi yield via dielectron decay in the same midrapidity range and at forward rapidity (1.2<|eta|<2.4) via dimuon decay. These results are compared with measurements from other experiments and discussed in the context of current charmonium production models. 
A. Adare, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, H.   Al-Bataineh, J. Alexander, A. Angerami, K. Aoki, N. Apadul...
hep-ex nucl-ex