Energy dependence of dissociative $J/\psi$ photoproduction as a signature of gluon saturation at the LHC

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 $F_2(x,Q^2)$ data from HERA at the relevant scale, as well as the exclusive and dissociative $J/\psi$ photoproduction data from H1 and ALICE. Our model predicts that for $W_{\gamma \mathrm{p}}\approx 500$ GeV, the dissociative $J/\psi$ cross section reaches a maximum and then decreases steeply with energy, which is in qualitatively good agreement to a recent observation that the dissociative $J/\psi$ background in the exclusive $J/\psi$ sample measured in photoproduction by ALICE decreases as energy increases. Our prediction provides a clear signature for gluon saturation at LHC energies.

10 pages plus references, 3 figures. This version matches accepted version

References in corpus (7)

• Parton distributions for the LHC
• The Color Glass Condensate
• Exclusive J/$\psi$ photoproduction off protons in ultra-peripheral p-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV
• Revealing proton shape fluctuations with incoherent diffraction at high energy
• Exclusive diffractive processes in electron-ion collisions
• Exclusive photoproduction of $J/\psi$ in proton-proton and proton-antiproton scattering
• A unified description of diffractive deep inelastic scattering with saturation

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