Observation of light-by-light scattering and new results from ultra-peripheral heavy-ion collisions in the ATLAS experiment
Light-by-light (LbyL) scattering, $\gamma \gamma \rightarrow \gamma \gamma$, is a very rare process allowed in Quantum Electrodynamics via a loop diagram. The precise measurement of this process is potentially sensitive to contributions from Beyond the Standard Model. Despite the small cross-section, the LbyL scattering can be observed in ultra-peripheral high energy heavy-ion collisions due to strong electromagnetic fields accompanying the lead beam. In this talk we discuss the first direct observation of LbyL scattering established by the ATLAS Collaboration using 2018 Pb+Pb dataset. We also summarize other new measurements done using ultra-peripheral events such as the measurement of multi-particle correlations and measurement of di-muon production.
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