J/ψ production in p+p collisions at √s = 200 GeV

Details J/ψ production in p+p collisions at √s = 200 GeV J/ψ production in p+p collisions at √s = 200 GeV

Mar 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mfsku..44...89s&link_type=abstract

Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics, Geophysics and Chemistry, (ISSN 0368-9689)

Physics

Atomic Physics

Atomic Physics

Scientific paper

Total and differential cross sections for inclusive J/ψ production have been measured in √s = 200 GeV p+p collisions at Relativistic Heavy Ion Collider in Brookhaven National Laboratory. J/ψ particles have been clearly identified via μ+μ- decays measured in the forward muon spectrometer covering 1.2 < y < 2.2 and via e+e- decays measured in the mid-rapidity spectrometers of the PHENIX experiment. Details of the muon channel measurement are presented in this paper based upon an 81-nb-1 integrated luminosity obtained in the second run period at RHIC. Corrected with the detection efficiency, the branching fraction times rapidity-differential cross section at forward rapidity Br(J/ψ→μ+μ-) dσJ/ψ/dy|y=1.7 = 37±7 (stat.) ±11 (syst.) nb has been obtained. The average transverse momentum of the J/ψ's, = 1.66±0.18 (stat.)±0.12 (syst.) GeV/c, is slightly higher than lower-energy results and consistent with a model expectation based on perturbative QCD. The total production cross section σJ/ψ = 3.8±0.6 (stat.)±1.3 (syst.) μb has been extracted by fitting both the muon and electron channel measurements, which is related with lower-energy results by gluon distribution functions currently available. Its normalization is well reproduced by both the color-octet model and color-evaporation model. The results have established the baseline necessary for the QGP search in Au+Au collisions as well as gluon polarization measurements in polarized p+p collisions at RHIC, where the unpolarized cross sections presented here will determine the absolute normalization.

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