- Start
- Jul 4, 201290% CONFIDENCEfrom the source
CERN Announces a Particle Consistent With the Higgs Boson
- On 4 July 2012 the ATLAS and CMS experiments announced at a CERN seminar that they had independently observed a new particle at around 125-126 GeV, at five sigma[1][2]
- CERN had announced the upcoming seminar on 22 June 2012, and rumours of a major announcement began spreading from around 1 July[2]
- The results were preliminary, from data collected in 2011 and 2012; on 31 July 2012 ATLAS added a third channel and improved the significance further[2]
- The existence of the Higgs field had been the last unverified part of the Standard Model: its nonzero value everywhere breaks the weak isospin symmetry of the electroweak interaction and, through the Higgs mechanism, gives rest mass to the massive elementary particles[2][3]
- Over 300 trillion LHC proton-proton collisions were analysed by the LHC Computing Grid to get there[2]
References 388% CONFIDENCE
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.
- [1]90%home.cern/cern-experiments-observe-particle-consistent-with-long-sought-higgs-bosonhome.cern· Posted Sep 22, 2026· Starts Jul 4, 2012 ✓· 33% of score
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".
- [2]90%Higgs bosonen.wikipedia.org· Added Sep 22, 2026· 33% of score
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]
- [3]85%The Higgs boson | CERNhome.cern· Added Sep 22, 2026· 33% of score
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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