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Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV

Abstract : 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.
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Submitted on : Tuesday, May 17, 2011 - 12:01:30 PM
Last modification on : Tuesday, January 5, 2021 - 9:30:19 AM

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A. Adare, A. Baldisseri, H. Borel, J.-L. Charvet, J. Gosset, et al.. Ground and excited charmonium state production in p+p collisions at sqrt(s)=200 GeV. Physical Review D, American Physical Society, 2012, 85, pp.092004. ⟨10.1103/PhysRevD.85.092004⟩. ⟨in2p3-00593737⟩

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