Abstract
AbstractLight-by-light (LbL) scattering (\(\gamma \gamma \rightarrow \gamma \gamma \)) is a fundamental quantum mechanical process which could not be observed until recently due to its tiny cross section. By using huge photon fluxes from lead-on-lead (PbPb) ultraperipheral collisions (UPCs), the process has now been observed by both ATLAS and CMS experiments. LbL process is also a sensitive channel to probe physics beyond the standard model where an intermediate pseudoscalar, axion-like-particle (a) could be produced, i.e., (\(\gamma \gamma \rightarrow a \rightarrow \gamma \gamma \)). The diphoton invariant mass distribution of LbL process is used to search for such a resonance production. A new exclusion limits on the mass of the pseudoscalar axion-like particles, in the range of 5–90 GeV has been set. This report will discuss highlights of the measurement of LbL scattering by CMS experiment.
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