(Originally published as a CMS Physics Briefing)
Dark matter is mysterious. In some ways, we know a lot about it, including its average density in the universe and upper limits for how strongly the dark matter particles might interact with each other or with “normal” Standard Model particles.
(Originally published as a CMS Physics Briefing)
The amount of data that CMS has collected so far is truly astounding, thanks to the very large number of proton-proton collisions that the LHC has provided, over more than a decade, and to the large rate of events that CMS can record.
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)
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.