Discovery of the Higgs Boson
On July 4, 2012, the CMS and ATLAS experiments at CERN announced the discovery of a new particle consistent with the Standard Model Higgs boson.

This set contains photos from that announcement as well as from some events leading up to it, and then a few photos from CERN on the day of the announcement of the 2013 Nobel Prize in Physics.

See also my set documenting milestones in LHC operations since 2009:
28 photos · 122 views