The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.
CERN's own press release is dated the day of the seminar, and Wikipedia's[2] Higgs boson article repeats it throughout: "On 4 July 2012, the discovery of a new particle with a mass between 125 and 127 GeV/c2 was announced" and "On 4 July 2012 both of the CERN experiments announced they had independently made the same discovery".
Dates the announcement, gives the mass window and the five-sigma significance, and explains the Higgs field and mechanism: a nonzero value everywhere that breaks the weak isospin symmetry of the electroweak interaction and gives rest mass to the massive elementary particles.[1]
CERN's own standing explainer for what the particle is and how it was found, maintained by the laboratory that announced it.[1]
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