The golden channel.

Collisions that left exactly four electrons or muons, sorted by their combined mass, m4ℓ. Each falling dot is one collision.

dataZZ* (sim)other (sim)Higgs (expected)– – background from data
–events at 120–130 GeV
–background expected there
–significance, statistics only
–where the peak sits

Two photons (ATLAS, 13 TeV) said 124.75 GeV.
Four leptons say 124.55 .

The two-photon one →