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Coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 5.02$ TeV
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abstract
Cross sections for the coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}= 5.02$ TeV are reported. The measurements, which rely on the $\pi^+\pi^-$ decay channel, are presented in three regions of rapidity covering the range $|y|<0.8$. For each rapidity interval, cross sections are shown for different nuclear-breakup classes defined according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on different models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/$c^2$ and a width of about 140 MeV/$c^2$ is reported and compared with similar observations from other experiments.
Forward citations
Cited by 3 Pith papers
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Modelling Coincident Particle Production in Ultraperipheral Heavy Ion Collisions
A new SuperChic Monte Carlo implementation reproduces the ATLAS-observed rate and kinematic dependence of coincident rho meson and dimuon production in ultraperipheral PbPb collisions.
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AI-powered full-data set search for new physics in ultraperipheral and diffractive events
Autoencoders trained on simulated known UPC processes flag injected J/psi to 4 pi and pentaquark events with high reported purity in toy ALICE-like data.
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Ultra-peripheral Collisions
Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.
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