Journal
PHYSICAL REVIEW D
Volume 91, Issue 11, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.91.114005
Keywords
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Funding
- Academy of Finland [267321, 273464]
- Graduate School of Particle and Nuclear Physics
- Academy of Finland (AKA) [273464, 267321, 273464, 267321] Funding Source: Academy of Finland (AKA)
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Inclusive production of J/psi mesons, especially at forward rapidities, is an important probe of small-x gluons in protons and nuclei. In this paper we reevaluate the production cross sections in the color glass condensate framework, where the process is described by a large x gluon from the probe splitting into a quark pair and eikonally interacting with the target proton or nucleus. Using a standard collinear gluon distribution for the probe and an up-to-date dipole cross section fitted to HERA data to describe the target we achieve a rather good description of the cross section in proton-proton collisions, although with a rather large normalization uncertainty. More importantly, we show that generalizing the dipole cross section to nuclei in the Glauber approach results in a nuclear suppression of J/psi production that is much closer to the experimental data than claimed in previous literature.
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