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

Not scheduled
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.

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

Primary author

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

Presentation materials

There are no materials yet.