Light-by-light scattering and search for axion-like particles with the CMS detector

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1h 40m


Poster Presentation Electroweak Probes


Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU))


The very strong electromagnetic fields found in PbPb collisions at the LHC make it effectively a photon-photon collider. Observation of the light-by-light scattering process, $\gamma\gamma \to \gamma\gamma$, in ultraperipheral PbPb collisions at a centre-of-mass energy per nucleon pair of 5.02 TeV recorded in 2018 by the CMS experiment is reported. The exclusive production of dielectrons is used as a process of similar production mechanism and experimental signature to control both the theoretical modeling and the reconstruction of low energy electromagnetic objects in the detector. Differential distributions in diphoton p$_{T}$, rapidity, mass, and acoplanarity are reported. The m$_{\gamma\gamma}$ distribution is used to set new exclusion limits on the production of pseudoscalar axion-like particles, via the $\gamma\gamma \to a \to \gamma\gamma$ process, down to 5 GeV.

Track Electroweak Probes
Contribution type Contributed Talk
Collaboration (if applicable) CMS

Primary author

Serguei Petrushanko (M.V. Lomonosov Moscow State University (RU))

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