Speaker
Description
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. Changes made to the ALICE experimental setup before Run 3 enable us to study inelastic collisions, a particular class of UPCs, where the target nucleus breaks up.
In this talk, we present the results of vector mesons in photon-nucleus interactions measured at midrapidity in Pb–Pb UPCs collisions. We will show recent results on coherent $\rho^{0}$ photoproduction, exclusive four pion photoproduction, as well as photoproduction of K$^{+}$K$^{-}$ pairs in Pb–Pb UPCs collisions at $\sqrt{s_{\rm{NN}}}$ = 5.02 TeV with Run 2 ALICE data. Latest results on inclusive photoproduction of resonances ($\rho^{0}$, $\phi$ and K$^{*0}$) in inelastic Pb-Pb UPCs collisions at $\sqrt{s_{\rm{NN}}}$ = 5.36 TeV with Run 3 ALICE data will be discussed.
| Field of contribution | Experiment |
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