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Energy dependence of dissociative J/ψ photoproduction as a signature of gluon saturation at the LHC
Cepila, J. ; Contreras, J. G. ; Tapia Takaki, Daniel
Cepila, J.
Contreras, J. G.
Tapia Takaki, Daniel
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Abstract
We have developed a model in which the quantum fluctuations of the proton structure are characterised by hot spots, whose number grows with decreasing Bjorken-x. Our model reproduces the F2(x,Q2) data from HERA at the relevant scale, as well as the exclusive and dissociative J/ψ photoproduction data from H1 and ALICE. Our model predicts that for Wγp≈500GeV, the dissociative J/ψ cross section reaches a maximum and then decreases steeply with energy, which is in qualitatively good agreement to a recent observation that the dissociative J/ψ background in the exclusive J/ψ sample measured in photoproduction by ALICE decreases as energy increases. Our prediction provides a clear signature for gluon saturation at LHC energies.
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Date
2017-01
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Elsevier
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Keywords
Gluon saturation, Vector meson photoproduction, LHC
Citation
J. Cepila, J.G. Contreras, J.D. Tapia Takaki, Energy dependence of dissociative J/ψ photoproduction as a signature of gluon saturation at the LHC, In Physics Letters B, Volume 766, 2017, Pages 186-191, ISSN 0370-2693, https://doi.org/10.1016/j.physletb.2016.12.063.