Charmonium production in pp collisions at PHENIX
Andrew S Hoover; the PHENIX Collaboration; Andrew S Hoover; Department of Physics, New Mexico State University, Las Cruces, NM 88003, USA; the PHENIX Collaboration; Department of Physics, New Mexico State University, Las Cruces, NM 88003, USA
Журнал:
Journal of Physics G: Nuclear and Particle Physics
Дата:
2004-01-01
Аннотация:
A preliminary measurement of the J/ψ production cross section in = 200 GeV pp collisions at PHENIX is presented. Using observations of the J/ψ → μ<sup>+</sup>μ<sup>−</sup> and J/ψ → e<sup>+</sup>e<sup>−</sup> decay channels, the total production cross section for J/ψ is found to be 3.8 ± 0.6 (stat.) ± 1.3 (sys.) µb. The measurement agrees well with predictions given by the colour evaporation model and non-relativistic QCD. Our one available data point for the differential p<sub>t</sub> cross section indicates that the colour octet production mechanisms dominate J/ψ production at RHIC.
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