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Ultra-peripheral collisions (UPCs) of relativistic heavy ions are a tool for studying the photonuclear interactions at the highest LHC energy. UPCs occur when the impact parameter between two colliding nuclei is greater than the sum of the nuclear radii. In UPCs, the photon emitted from one nucleus can fluctuate to a quark-antiquark pair (dipole), which then elastically scatters off the target nucleus, emerging as a vector meson or an oppositely charged pseudoscalar meson pair, and both nuclei remain intact. In this contribution, we will discuss the results on exclusive four-pion and K \(^{+}\) K \(^{-}\) pairs photoproduction in Pb–Pb UPCs at \(\sqrt{s_\mathrm{{NN}}}\) = 5.02 TeV.

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Study of Photonuclear Interactions in Ultra-Peripheral Pb–Pb Collisions with ALICE

  • 会议论文

  • 发表日期：

    2025年

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  • Sandeep Dudi

摘要

Ultra-peripheral collisions (UPCs) of relativistic heavy ions are a tool for studying the photonuclear interactions at the highest LHC energy. UPCs occur when the impact parameter between two colliding nuclei is greater than the sum of the nuclear radii. In UPCs, the photon emitted from one nucleus can fluctuate to a quark-antiquark pair (dipole), which then elastically scatters off the target nucleus, emerging as a vector meson or an oppositely charged pseudoscalar meson pair, and both nuclei remain intact. In this contribution, we will discuss the results on exclusive four-pion and K \(^{+}\) K \(^{-}\) pairs photoproduction in Pb–Pb UPCs at \(\sqrt{s_\mathrm{{NN}}}\) = 5.02 TeV.