ATLAS reports differential cross sections for coherent exclusive J/ψ → μ⁺μ⁻ in Pb+Pb ultraperipheral collisions at √s_NN=5.36 TeV, agreeing with models but in tension with prior Run 2 data at central rapidity.
Coherent photoproduction of $J/\psi$ in nucleus-nucleus collisions in the color dipole approach
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abstract
We investigate the exclusive photoproduction of $J/\psi$-mesons in ultraperipheral heavy ion collisions in the color dipole approach. We first test a number of dipole cross sections fitted to inclusive $F_2$-data against the total cross section of exclusive $J/\psi$-production on the free nucleon. We then use the color-dipole formulation of Glauber-Gribov theory to calculate the diffractive amplitude on the nuclear target. The real part of the free nucleon amplitude is taken into account consistent with the rules of Glauber theory. We compare our results to recent published and preliminary data on exclusive $J/\psi$ corrections in ultraperipheral lead-lead collisions at $\sqrt{s_{NN}}=2.76 \, \rm{TeV}$ and $\sqrt{s_{NN}} = 5.02 \, \rm{TeV}$. Especially at high $\gamma A$ energies there is room for additional shadowing corrections, corresponding to triple-Pomeron terms or shadowing from large mass diffraction.
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UNVERDICTED 2representative citing papers
A review summarizing experimental evidence, theoretical models of nuclear shadowing, model-agnostic nuclear PDF extractions, and prospects for LHC and EIC studies.
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Measurement of coherent exclusive $J/\psi\to\mu^+\mu^-$ production in ultraperipheral Pb+Pb collisions at $\sqrt{s_{\textrm{NN}}}=5.36$ TeV with the ATLAS detector
ATLAS reports differential cross sections for coherent exclusive J/ψ → μ⁺μ⁻ in Pb+Pb ultraperipheral collisions at √s_NN=5.36 TeV, agreeing with models but in tension with prior Run 2 data at central rapidity.
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Nuclear parton distributions and nuclear shadowing
A review summarizing experimental evidence, theoretical models of nuclear shadowing, model-agnostic nuclear PDF extractions, and prospects for LHC and EIC studies.