Forward J /ψ production in proton-nucleus collisions at high energy
Ducloue, B., Lappi, T., & Mäntysaari, H. (2015). Forward J /ψ production in proton-nucleus collisions at high energy. Physical Review D, 91(11), Article 114005. https://doi.org/10.1103/PhysRevD.91.114005
Published inPhysical Review D
© American Physical Society 2015. This is a version of an article whose final and definitive form has been published by American Physical Society.
Inclusive production of J/ψ 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/ψ production that is much closer to the experimental data than claimed in previous literature.
PublisherAmerican Physical Society
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