# paper review

## Lazy photons at the LHC

Title: “Search for long-lived particles using delayed photons in proton-proton collisions at $\sqrt{s}$ = 13 TeV” Author: CMS Collaboration Reference: https://arxiv.org/abs/1909.06166 (submitted to Phys. Rev. D) (Originally published on Particle Bites)

## When light and light collide

Title: “Evidence for light-by-light scattering in heavy-ion collisions with the ATLAS detector at the LHC” Author: ATLAS Collaboration Reference: doi:10.1038/nphys4208 (Originally published on Particle Bites) According to classical wave theory, two electromagnetic waves that happen to cross each other in space will not interfere.